Classification
Within iNaturalist.org

All Names

  • English
    • Western Tent Caterpillar Moth
    • Western Tent Caterpillar
  • Scientific Names
    • Malacosoma californicum
    • Mallacosoma californicum

Guide Colors

     

Extras

Taxonomic changes »

Taxon schemes »

Make taxonomic Flickr tags for this taxon »

Flickr invite link »

Wikipedia taxobox »

Tree Browser »

Search descendant taxa »

Embed a widget for this taxon on your website »

Recent observations

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

icosahedron

Date

April 18, 2014 11:50 AM PDT

Description

On willow.

Photos / Sounds

What

Western Tent Caterpillar Moth Malacosoma californicum

Date

March 25, 2014

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

beartracker

Date

October 2, 2012

Description

Western tent caterpillars on madrone tree.

Reference

A Field Guide to Insects and Diseases of California Oaks

General Technical Report
PSW-GTR-197
July 2006

Tedmund J. Swiecki
Elizabeth A. Bernhardt

Tent caterpillars
Western tent caterpillar - Malacosoma californicum
Pacific tent caterpillar - M. constictum
Forest tent caterpillar - M. disstria
(Lasiocampidae)

Pg. 20

The Pacific tent caterpillar occurs in California, Oregon, and Washington and is reported only on oaks.

The western tent caterpillar occurs west of the Rocky Mountains and in New York. Four subspecies (Malacosoma californicum ssp. ambisimilis, californicum, fragile, and recenseo) with distinct geographic ranges are reported in California. The species is reported on oak, willow, poplar, birch, alder, madrone, ceanothus, redbud, hazel, ash, toyon, apple, almond, apricot, cherry, prune, plum, coffeeberry, currant, antelope bitterbrush, and apple.

Pg. 21

Western tent caterpillar larvae spin large tents of silk (fig. 13) and the larvae do most of their feeding in the tents.

Forest tent caterpillars do not construct tents; they construct silken mats on branches or the trunk where the larvae congregate when at rest or during molting.

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

beartracker

Date

October 2, 2012

Description

Western tent caterpillars on madrone tree.

Reference

A Field Guide to Insects and Diseases of California Oaks

General Technical Report
PSW-GTR-197
July 2006

Tedmund J. Swiecki
Elizabeth A. Bernhardt

Tent caterpillars
Western tent caterpillar - Malacosoma californicum
Pacific tent caterpillar - M. constictum
Forest tent caterpillar - M. disstria
(Lasiocampidae)

Pg. 20

The Pacific tent caterpillar occurs in California, Oregon, and Washington and is reported only on oaks.

The western tent caterpillar occurs west of the Rocky Mountains and in New York. Four subspecies (Malacosoma californicum ssp. ambisimilis, californicum, fragile, and recenseo) with distinct geographic ranges are reported in California. The species is reported on oak, willow, poplar, birch, alder, madrone, ceanothus, redbud, hazel, ash, toyon, apple, almond, apricot, cherry, prune, plum, coffeeberry, currant, antelope bitterbrush, and apple.

Pg. 21

Western tent caterpillar larvae spin large tents of silk (fig. 13) and the larvae do most of their feeding in the tents.

Forest tent caterpillars do not construct tents; they construct silken mats on branches or the trunk where the larvae congregate when at rest or during molting.

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

beartracker

Date

September 24, 2011

Description

Western tent caterpillars on madrone tree.

Reference

A Field Guide to Insects and Diseases of California Oaks

General Technical Report
PSW-GTR-197
July 2006

Tedmund J. Swiecki
Elizabeth A. Bernhardt

Tent caterpillars
Western tent caterpillar - Malacosoma californicum
Pacific tent caterpillar - M. constictum
Forest tent caterpillar - M. disstria
(Lasiocampidae)

Pg. 20

The Pacific tent caterpillar occurs in California, Oregon, and Washington and is reported only on oaks.

The western tent caterpillar occurs west of the Rocky Mountains and in New York. Four subspecies (Malacosoma californicum ssp. ambisimilis, californicum, fragile, and recenseo) with distinct geographic ranges are reported in California. The species is reported on oak, willow, poplar, birch, alder, madrone, ceanothus, redbud, hazel, ash, toyon, apple, almond, apricot, cherry, prune, plum, coffeeberry, currant, antelope bitterbrush, and apple.

Pg. 21

Western tent caterpillar larvae spin large tents of silk (fig. 13) and the larvae do most of their feeding in the tents.

Forest tent caterpillars do not construct tents; they construct silken mats on branches or the trunk where the larvae congregate when at rest or during molting.

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

dnydick

Date

June 23, 2013 01:12 PM EDT

Photos / Sounds

Observer

justin2

Date

June 15, 2013 08:14 AM PDT

Description

Black caterpillar, orange stripes, white and some black tufts. Sleeping on the pavement in the morning shade.

Photos / Sounds

No photos or sounds

What

Western Tent Caterpillar Moth Malacosoma californicum

Observer

claire_delbecq7

Date

May 28, 2013

Photos / Sounds

Observer

icosahedron

Date

June 3, 2013 01:50 PM PDT

Description

On a willow branch.

Photos / Sounds

Observer

icosahedron

Date

June 3, 2013 01:40 PM PDT

Description

On a willow branch.

Photos / Sounds

Observer

velizo

Date

May 25, 2013

Photos / Sounds

What

Western Tent Caterpillar Malacosoma californicum

Observer

icosahedron

Date

May 8, 2013 10:15 AM PDT

Description

The caterpillars seemed to be dead, as you can see in the second picture where I've breached the tent.

View all observations

Description from Wikipedia

The Western Tent Caterpillar (Malacosoma californicum) is a moth of the family Lasiocampidae. It is a tent caterpillar. It is found in the western part of the Nearctic ecozone.

No range data available.