Denver-Boulder Metro Area: Bugs
This guide contains spiders, bees, wasps, ants, beetles, dragonflies, grasshoppers, flies and other bugs that can be found in the Denver-Boulder Metro Area, including Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, and Jefferson Counties.
Bristly Millipede
Polyxenus lagurus, known as the bristly millipede is a species of millipede found in many areas of Europe and North America. It is covered with detachable bristles that have the ability to entangle ants and spiders that attack the animal.
House Centipede
Scutigera coleoptrata – one of several species commonly known as the house centipede – is a typically yellowish-grey centipede with up to 15 pairs of legs. Originating in the Mediterranean region, the species has spread to other parts of the world, where it can live in human homes. It is an insectivore; it kills and eats other arthropods, such as insects and arachnids.
Common Desert Centipede
Scolopendra polymorpha, the common desert centipede, tiger centipede, banded desert centipede, or Sonoran Desert centipede, is indigenous to the Southwestern United States and northern Mexico, north to the Pacific coast. It inhabits dry grasslands, forest, and desert; in these habitats, the centipedes generally take up residence under rocks, though ...more ↓
Common candy-striped spider
Enoplognatha ovata is a species of spiders belonging to the family Theridiidae.
Western Black Widow
Latrodectus Hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be yellow, and on rare occasions, white. The male of the species is around half ...more ↓
Northern Black Widow
Latrodectus variolus, the Northern black widow spider or Northern widow, is a venomous spider species of the Latrodectus genus in the Theridiidae family. The population is closely related to the Southern Black Widow, Latrodectus mactans, and the Western Black Widow, Latrodectus hesperus, of the genus.
White-spotted False Widow
Steatoda albomaculata is a species of cobweb spider in the family Theridiidae. It is found in the United States and a range from the Caribbean to Brazil.
Rabbit Hutch Spider
Steatoda bipunctata is a species of cob-web spider, of the genus Steatoda, in the family Theridiidae.
False Black Widow
Steatoda grossa, commonly known as the cupboard spider, the dark comb-footed spider, the brown house spider (in Australia), or the false black widow (though several other species are known by these names), is a common species of spider in the genus Steatoda.
Triangulate Comb-foot
The triangulate cobweb spider (scientific name: Steatoda triangulosa; also called the triangulate bud spider) is a common house spider in the genus Steatoda. As the name indicates, it is well known for the triangle-shaped pattern on the dorsal side of its abdomen.
Yellow Garden Spider
The spider species Argiope aurantia is commonly known as the yellow garden spider, black and yellow garden spider, golden garden spider, writing spider, corn spider, or McKinley spider. It is common to the contiguous United States, Hawaii, southern Canada, Mexico, and Central America. It has distinctive yellow and black markings on the ...more ↓
Banded Garden Spider
Argiope trifasciata (also known as the banded garden spider in the United States) is a species of spider found around the world. It can be found in certain areas of Europe, namely the Iberian Peninsula, the Canary Islands or Madeira. The similar looking Argiope bruennichi is common in the Azores. Considered a pest in some areas, they typically begin to appear ...more ↓
Furrow Orbweaver
Larinioides cornutus, the furrow spider, is an orb-weaver spider with Holarctic distribution.
Ornamental Orbweaver
Larinioides patagiatus is a species of orb weaver in the family Araneidae. It is found in North America, Europe, Turkey, Caucasus, Russia to Central Asia, China, Mongolia, and Japan.
Northern Orbweaver
Aculepeira packardi is a species of orb weaver in the family of spiders known as Araneidae. It is found in North America, Russia, China, and Kazakhstan.
Conical Trashline Orbweaver
Cyclosa conica is a small spider with no common name. It is an orb weaver, and it is easily recognized by the way it strings together the dead bodies of insects and other debris and hangs it near the center of its web. It hides on this string of debris, and its natural coloration makes it extremely difficult to see until it moves. One of its defenses against predators is to ...more ↓
Humped Trashline Orbweaver
Cyclosa turbinata is a species of orb weaver in the family of spiders known as Araneidae. It is found in a range from the United States to Panama, West Indies, Galapagos Islands, and and has been introduced into Hawaii.
Gem-shaped Orbweaver
Araneus gemma, commonly known as the cat-faced spider (a name shared with Araneus gemmoides), is a common outdoor orb-weaver spider found in the western United States and Canada.
Cat-faced Orb-Weaver
Araneus gemmoides, commonly known as the Jewel Spider (a name shared with Austracantha minax) and Cat-faced Spider (a name shared with Araneus gemma), is a common outdoor orb-weaver spider found in the USA and Canada. They are considered harmless and have low-toxicity venom.A. gemmoides are useful natural predators for insects.
Shamrock Orbweaver
Araneus trifolium, the shamrock orbweaver, is a species of orb weaver in the family Araneidae. It is found in the USA and Canada.
Six-spotted Orbweaver
Araniella displicata, the sixspotted orbweaver, is a species of orb weaver in the family of spiders known as Araneidae. It is found in North America, Europe, a range from Russia to Kazakhstan, China, Korea, and Japan.
Arabesque Orbweaver
Neoscona arabesca is a common orb-weaver spider found throughout the United States and Canada. Often called the "arabesque orbweaver," after the cryptic, brightly-colored, swirling markings on its prominent abdomen, this spider can be found in fields, forests, gardens, and on human structures. Neoscona species are among the most common and abundant orb weavers and are ...more ↓
Spotted Orbweaver
Neoscona crucifera is an orb-weaver spider in the family Araneidae. It is found in the United States from Maine to Florida in the east, to Minnesota in the Midwest, to Arizona in the southwest, and in Mexico. Its common names include Hentz orbweaver, spotted orbweaver, and barn spider, though the latter nickname suggests the confusion that can result from using ...more ↓
Western Spotted Orbweaver
Neoscona oaxacensis, known as western spotted orbweaver and zig-zag spider, is a species of spider in the family Araneidae. It is distributed in the Americas, from Kansas and California south to Venezuela and Peru, including the Galápagos Islands.
Common Stretch Spider
Tetragnatha extensa is a species of spider found across the Northern Hemisphere. It has an elongate body, up to 11 mm (0.43 in) long, and adopts a straight line posture when alarmed. It lives on low vegetation in damp areas, and feeds on flying insects which it catches in its web.
Orchard Orbweaver
Leucauge venusta, known as the orchard spider, is a long-jawed orbweaver spider that occurs from southern Canada to Colombia, along the East coast, reaching into the central US. The web is often oriented horizontally, with the spider hanging down in the center.
Bowl-and-doily Spider
The bowl and doily spider (Frontinella communis) is a species of sheet weaver found in North and Central America. It is a small spider, about 4 mm (0.16 in) long, that weaves a fairly complex sheet web system consisting of an inverted dome shaped web, or "bowl", suspended above a horizontal sheet web, or "doily", hence its common name. The spider hangs from the underside of the ...more ↓
Pityohyphantes cristatus
Pityohyphantes cristatus is a species of sheetweb spider in the family Linyphiidae. It is found in the United States.
Filmy Dome Spider
The filmy dome spider (Neriene radiata AKA Prolinyphia marginata and others in this genus) is a sheet weaver: a spider in the family Linyphiidae. These spiders construct a dome of fine silk and hang upside-down under it, waiting for their prey.
Thick-headed Dwarf Weaver
Ceraticelus crassiceps is a species of dwarf spider in the family Linyphiidae. It is found in the United States.
Barn Funnel Weaver
The spider species Tegenaria domestica, commonly known as the barn funnel weaver in North America and the domestic house spider in Europe, is a member of the funnel-web family Agelenidae and a close relative of the hobo spider.
Pennsylvania Grass Spider
Agelenopsis pennsylvanica is a species of funnel weaver in the family of spiders known as Agelenidae. It is found in the United States.
Hobo Spider
The hobo spider (Eratigena agrestis, formerly Tegenaria agrestis) is a member of the genus of spiders known colloquially as funnel web spiders, but not to be confused with the Australian funnel-web spider. The medical significance of its bite is still poorly understood and debated. Individuals construct a funnel-shaped structure of silk sheeting and lie in ...more ↓
Carolina Wolf Spider
Hogna carolinensis, also known as the Carolina wolf spider, is usually regarded as the largest of the wolf spiders found in North America. The body length of females is typically 25 millimetres (0.98 in), and the body length of males is typically around 19 mm (0.75 in). Members of this species are known to live in burrows that they dig.
Rustic Wolf Spider
Trochosa ruricola is a wolf spider whose common name is rustic wolf spider. The females are 15 mm (0.6 in) but can reach 25 mm (1.0 in), and the males are 10 mm (0.4 in). Both sexes are dark brown and have a pale band that runs down to the carapace and continues to the abdomen.
Drumming Sword Wolf Spider
Gladicosa gulosa is a type of wolf spider found in Beech-Maple forests of the US and Canada, where the spider can be found in the plant strata of ground, herb or shrub. It is not one of the more common wolf spiders.
Tigrosa grandis
Tigrosa grandis is a species of wolf spider in the family Lycosidae. It is found in the United States.
Wetland Giant Wolf Spider
Tigrosa helluo is a species of spider in the family Lycosidae. It was formerly known as Hogna helluo. It is found in the Canada, the United States and Mexico.
Schizocosa mccooki
Schizocosa mccooki is a species of wolf spider in the family Lycosidae. It is found in North America.
Mackenzie's Thin-legged Wolf Spider
Pardosa mackenziana is a species of wolf spider in the family Lycosidae. It is found in the United States and Canada.
Striped Fishing Spider
Dolomedes scriptus is a fishing spider found in the United States and Canada, known as the striped fishing spider. Female spiders can grow to be over 6 cm in legspan. The spider is a pale brown colour with lighter stripes around its legs and a stripe down each side of the body. It is similar to D. tenebrosus.
Six-spotted Fishing Spider
The six-spotted fishing spider, Dolomedes triton, is an arachnid from the nursery web spider family Pisauridae. This species is from the genus Dolomedes, the fishing spiders. This species of fishing spider is named after the mythological Greek god Triton who is the messenger of the big sea and the son of Poseidon. These spiders can be seen scampering along the ...more ↓
Striped Lynx Spider
Oxyopes salticus is a species of lynx spider, commonly known as the Striped Lynx Spider, first described by Hentz in 1845. Its habitat tends to be grasses and leafy vegetation; grassy, weedy fields, and row crops.
Dictyna calcarata
Dictyna calcarata is a species of mesh web weaver in the spider family Dictynidae. It is found in the United States, Mexico, and has been introduced into Hawaii.
Greater Ant-mimic Corinne Spider
Phrurotimpus borealis is a species of true spider in the family Phrurolithidae. It is found in North America.
Red-spotted Ant-mimic Sac Spider
Castianeira descripta, the redspotted antmimic, is a species of true spider in the family Corinnidae. It is found in the United States and Canada.
Long-palped Ant-mimic Sac Spider
Castianeira longipalpa is a species of true spider in the family Corinnidae. It is found in the United States and Canada.
Yellow Sac Spider
Cheiracanthium mildei is a species of spider from the Eutichuridae family. C. mildei is commonly known as the northern yellow sac spider, a name it shares with many other spiders of its genus.
Zelotes fratris
Zelotes fratris is a species of ground spider in the family Gnaphosidae. It is found in Russia (Siberia) and North America.
Zelotes lasalanus
Zelotes lasalanus is a species of ground spider in the family Gnaphosidae. It is found in North America.
Glossy Ant-spider
Micaria pulicaria, the glossy ant spider, is a species of ground spider from the family Gnaphosidae with a Holarctic distribution.
Common Patterned Ant-mimic Ground Spider
Sergiolus montanus is a species of ground spider in the family Gnaphosidae. It is found in North America.
Sergiolus tennesseensis
Sergiolus tennesseensis is a species of ground spider in the family Gnaphosidae. It is found in the United States.
Eastern Parson Spider
The spider species Herpyllus ecclesiasticus is commonly called the eastern parson spider, after the abdominal markings resembling an old-style cravat worn by clergy in the 18th century. It is mainly found in Central USA, with finds stretching from North Carolina to southern Alberta, Canada.
Western Parson Spider
Herpyllus propinquus, the western parson spider, is a species of ground spider in the family Gnaphosidae. It is found in North America.
Orodrassus coloradensis
Orodrassus coloradensis is a species of ground spider in the family Gnaphosidae. It is found in the United States and Canada.
Multicolored Bark Crab Spider
Bassaniana versicolor is a species of spiders under the Bassaniana genus.
Goldenrod Crab Spider
Misumena vatia is a species of crab spider with holarctic distribution. In North America, where it is the largest and best-known flower spider, it is called the goldenrod crab spider or flower (crab) spider, because it is commonly found hunting in goldenrod sprays in the autumn. Young males in the early summer may be quite small and easily overlooked, but females ...more ↓
Tan crab spider
Xysticus ferox, the brown crab spider, is a species of crab spider in the family Thomisidae. It is found in the USA and Canada.
Three-banded Crab Spider
Xysticus triguttatus, the three-banded crab spider, is a species of crab spider in the family Thomisidae. It is found in the United States and Canada.
Eurasian Running Crab Spider
Philodromus dispar is a philodromid crab spider found on trees and bushes. It is an agile hunter. The female of the species is variable in size and colour. The male is shiny and iridescent black or dark brown with white edges.
California Flattened Jumping Spider
Platycryptus californicus is a species of jumping spider in the family Salticidae. It is found in North and Central America.
Buttonhook Leaf-beetle Jumping Spider
Sassacus vitis is a species of jumping spider. It is native to North America, with a range spanning from Canada to Panama.
Bronze Jumping Spider
Eris militaris, known generally as the bronze jumper or bronze lake jumper, is a species of jumping spider in the family Salticidae. It is found in the United States and Canada.
Coppered White-cheeked Jumping Spider
Pelegrina aeneola is a species of jumping spider in the family Salticidae. It is found in North America.
Peppered Jumper
Pelegrina galathea, commonly known as the peppered jumper, is a species of jumping spider. It is endemic to North America, occurring from Canada to Costa Rica. It is normally found in sunlit, grassy areas.
Carolina Jumping Spider
Phidippus carolinensis is a species of jumping spider in the family Salticidae. It is found in the United States and Mexico.
Phidippus asotus
Phidippus asotus is a species of jumping spiders in the family Salticidae. It is found in the USA and Mexico.
Phidippus adumbratus
Phidippus adumbratus is a species of jumping spider in the family Salticidae. It is found in the USA.
Phidippus insignarius
Phidippus insignarius is a species of jumping spider in the family Salticidae. It is found in the United States.
Phidippus octopunctatus
Phidippus octopunctatus is a jumping spider that occurs in the United States and Mexico, mostly in the Great Basin Desert. It is among the largest jumping spiders found in North America, approaching 25 millimetres (0.98 in) in body length. They are gray to brownish-gray in color.
