Being eaten by a jumping spider.
Zillions of these were flying (and dying) along the lakeshore of Granger Lake at Willis Creek Park. The body length on these was on the order of 2 cm. A quick glance through BugGuide suggests that these are probably Hexagenia bilineata.
Small (5-6 mm, size 18-20). Brown body, clear wings, 3 tails.
Fairly small (size 16, or 7 mm) olive/yellow/orange body with some brown striping on side of first few abdominal segments. Darker brown-orange thorax. Dark cross veins. Two tails. Dark, wide-set eyes. Captured some duns. Also saw several spinners in air that were probably the same species.
Large (10-12 mm or so), whitish body, clear wings.
Saw several of these flying above water, but could not catch any to get a clearer ID. This was the same as one of the larger Maccaffertiums I saw on the same river on September 13. It's possible that both of the large light colored Maccaffertiums were present.
Large (12-13mm body), clear wings, brown body. Remarkable eyes - wide-set, reddish-brown with cream stripe across the middle, and a small black dot in the middle of the stripe. Middle and hind legs light colored. Front legs dark with light colored forelegs.
Large (14 mm body), dark grey/brown body, grey wings with dark veins, 2 tails. middle and hind legs light in color, front wings dark color, including forelegs. Eyes wide-set, dark.
Quite small (4mm, or size 24), brown body, large orange eyes, 3 tails. Grey wings, obvious hind wings.
Mayflies or shadflies are insects belonging to the order Ephemeroptera (from the Greek εφημερος, ephemeros = "short-lived" (literally "lasting a day" "daily" or "day-long"), πτερον, pteron = "wing", referring to the brief lifespan of adults). They have been placed into an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. They are aquatic insects whose immature stage (called "naiad" or, colloquially, "nymph") usually lasts one year in fresh water. The adults are...