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Fly - Asteia beata - female

Fly - Asteia beata - Female
Burlington, Middlesex County, Massachusetts, USA
May 15, 2009
Size: 3 mm (with wings)
Hanging around a window.

Images of this individual: tag all
Fly - Asteia beata - female Bottom - Asteia beata - female Tail - Asteia beata - female Tail (side view) - Asteia beata - female Abdominal pattern - Asteia beata - female Side of thorax - Asteia beata - female Mesonotum - Asteia beata - female

Moved from Asteia.

Moved from Asteiidae. Asteia based on lack of dm-cu & presence of arista. Thank you for contributing this.

Asteia beata?
It matches the species Asteia beata, originally described from Massachusetts. See Psyche 22:95. But I note that ITIS and Nearctica list disjoint sets of species. This one is listed on nearctica, not ITIS.

This must be A. beata. Sabrosky includes 3 Nearctic species in his key: A. multipunctata occurs further west and has a yellow mesonotum with blackish spots, and A. expansa occurs in Florida and the Neotropics; although the key character separating it from A. beata (mesonotum polished in expansa vs. slightly pollinose in beata) is difficult to assess in this photo I think the range alone can exclude it.

Thanks for looking. I added my best closeup of the mesonotum. The spot pattern on the abdomen isn't quite as described, but the original description was based on one or two specimens and I get the feeling that revisers have not been able to see many individuals to determine variation.

Thanks to you and Matthias Buck for looking at this. Now I don't feel so bad about being unable to place it.

Can it be IDed to species? ITIS lists 9 species, but 6 were first described in a book titled Insects of Hawaii and another is called hawaiiensis. There may be only two known species from North America.

Also, is it female?

yes it is female
there are 3 species in the continental US according to the MND (1). I don't know how to ID them. Maybe one could try this paper, cited in the MND:

Sabrosky, C. W. 1957. Synopsis of the New World species of the dipterous family Asteiidae. Ann. ent. Soc. Am. 50:43-61

fascinating fly indeed. spent some time staring at it...

Great, the first asteiid on Bugguide!

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