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M and Cu connected by a long more or less horizontal crossvein bM-Cu, which meets Cu before base of posterior fork.
Basal portion of M entirely reduced.
Rs arising from R well beyond crossvein H.
Stem of M1 and M1 present.
Wings usually with fork of M much longer than stem, and lanceolate rather than bell-shaped.
R4 absent.
C ending at apex of R5.
Point of furcation of CuA beyond level of point of furcation of M.
Crossvein R-M at least twice as long as stem of median fork, usually longer;
apical half of R5 straight, and divergent from M1.
Rs almost or quite straight.
Fork of Cu short.
Cu2 quite straight.
r-m very long, more than twice as long as the stem of the median fork.