Posted by John Carr on 31-08-2014 20:49
#6
The wing is typical Diamesinae, with right angled anal lobe, long, curved r-m crossvein, and short m-cu crossvein intersecting after the fork in Cu. (Maybe it's a crossvein between M1+2 and M3+4 in modern terminology.)
Several species of
Diamesa fly in winter in temperate and boreal North America.