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Midge - Chasmatonotus unimaculatus

Midge - Chasmatonotus unimaculatus
Woburn, Middlesex County, Massachusetts, USA
June 5, 2006
Size: 2.8mm
This is just like one I found in NH a year ago 1.

Moved from Chasmatonotus.

Thanks John
This one does look pretty distinctive, and I remember it running around like crazy on the leaf surface, kind of like a phorid.

Chasmatonotus (Orthocladiinae)
I was going to tentatively guess Orthocladiinae. Then I checked Marshall(1) and saw the picture of Chasmatonotus. This is a (partly?) ground-mating genus with similar, short antennae in both sexes. "The genus Chasmatonotus is readily distinguishable from any other chironomid genera by having a median longitudinal fissure on the mesoscutum." (Quoting from a paper on Japanese species.) The wing pattern is unusual if not unique. This picture might even be identifiable to species with descriptions of all the candidates in hand.

The genus was originally described from New Hampshire and is now known from much of North America and Japan.

Your other pictures aren't clear enough to see the line on the back but I can't imagine what else they could be but more of the same genus.

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