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Photo#405018
Fly with

Fly with "flags" at end of forelegs - Dolichopus pulchrimanus - Male
Cincinnati, Hamilton County, Ohio, USA
June 3, 2010
Found on vegetation near Little Miami River.

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Moved
Moved from Dolichopus.

Moved
Moved from Longlegged Flies.

Identification
This is a male specimen of a Dolichopus species, a genus which reaches it highest species diversity in the Holarctic. The enlarged and flattened terminal tarsal segments of the fore leg are specific and are usually termend Male Secondary Sexual Characters (MSSC), ornaments that are used during courtship. They are definitely not pollen. Concerning the identification of the species, I have collected it (or a closely related species) in southern Ontario, and it might be related to D. willistoni (if I am not mistaken).

 
Cf. D. pulchrimanus
According to the catalog(1) Dolichopus willistoni is a junior synonym of D. pulchrimanus, which does have a black and white forked fifth tarsomere.(2)

Moved
Moved from ID Request.

Looks like
a Longlegged Fly in the Family Dolichopodidae. The "flags" might be pollinia (packets of pollen) picked up from flowers.

I could be wrong on both counts, however, so wait to see what the experts have to say.

 
Secondary sexual characters
Male Dolichopodidae sometimes have modified legs.

 
Thanks, John. They are a ver
Thanks, John. They are a very interesting accessory!

 
Never would've guessed.
Thanks for the explanation.

 
I have seen something close to this...
...but I haven't been able to get a very good picture because they are very small and don't sit still very long. These expansions are on each of these flies and in the exact spot. My flies and their expanded section look different than yours and I am still waiting for them to be identified.


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