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Photo#1170877
Snow Fly, which one - Chionea stoneana - male

Snow Fly, which one - Chionea stoneana - Male
100 Acre Wood, Winneshiek County, Iowa, USA
December 3, 2015
November 29, 2015: I was delighted to find this on the garage door. At first glance I thought it was a tiny spider, and then realized I didn't know what it was. But I did know it was something cool. I've never seen a Snow Fly before (and have yet to see a Snow Scorpionfly)

I emailed Dr. G. Courtney who wrote that he has seen them in MN and WI but not in Iowa. He also referenced: Byers (1983. University of Kansas Science Bulletin) which shows one species, Chionea stoneana, in Iowa and another (C. valga) VERY close (SE Minnesota & adjacent parts of Wisconsin).

I don't have a copy of Byers paper but I do have a copy of this: Snow Flies

Images of this individual: tag all
Snow Fly, which one - Chionea stoneana - male Snow Fly, antennae, ventral - Chionea stoneana - male Snow Fly, which one - Chionea stoneana - male Snow Fly - Chionea stoneana - male Snow Fly, dorsalX - Chionea stoneana - male Snow Fly, head, dorsal - Chionea stoneana - male Snow Fly, male - Chionea stoneana - male Snow Fly, ventral - Chionea stoneana - male Snow Fly, ventralX - Chionea stoneana - male Snow Fly, antennae, ventral - Chionea stoneana - male

Moved
Moved from Snow Flies.

Byers paper

 
Thank you!
I wasn't able to key but a comparison of the two species leads me to guess this is Chionea stoneana.
1. C. stoneana: color, brown to blackish brown, C. valga: reddish brown to grayish brown
2. C. stoneana: anenneae consisting of scape, pedicel and 3 (rarely 2) flagellomeres C. valga: fusion segment …. 4-5 additional flagellomeres
3. I don’t have a lateral photo of the mesonotum (plan to take one) but it does not fit description of C. valga: mesonotum conspiculously humped in lateral aspect with anterior slope nearly perpendicular to pronotum
4. C. stoneana: halters pale grayish brown (in alcohol), contrasting conspicuously with color of thoracic dorsum, C. valga: halteres grayish brown, contrasting with color of thoracic dorsum but not conspicuously so.
5. C. valga: legs of moderate length with hind femora extending only approx. to end of abdomen

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