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fly - Brontaea humilis - male

fly - Brontaea humilis - Male
Bolton, Worcester County, Massachusetts, USA
October 25, 2012
Size: 4.5mm

Images of this individual: tag all
fly - Brontaea humilis - male fly - Brontaea humilis - male

Brontaea humilis (Zetterstedt, 1860)
Moved from House Flies and kin.

Still waiting on other feedback, but I've convinced myself this is the correct ID. An introduced species from the Old World, this is apparently a new state record (previously known from MI, NC, ON, QC, BC). Breeds in horse dung.

Features of B. humilis, noted in (1), all match: scutum of male dark-brown dusted, no vittae; dark calypters, and sunken parafacials, also the setal pattern on sternite 1 and setae on hind tibiae. Note the female will look quite different, with prominent gray vittae.

Nikita Vikhrev seems to agree this is probably Brontaea humilis, see thread on

Although still "recently" (e.g. (1)) placed in Brontaea, this species is placed in Gymnodia on I will leave as is for now, but the genus name may need to be changed.

Brontaea humilis
Brad, great work getting this identified! I found it near some large farm fields and people do occasionally ride horses there.

Keep an eye out for more
and possible females as well. Photo of female specimen here.

Family ID confirmed from specimen, now a photo-voucher. Thanks Tom.

I have a hunch about the ID, but will post these over on to see what they say.

Moved from Muscoidea.

Moved from Flies.

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