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Published online by Cambridge University Press: 31 May 2012
Related to crassipes Meigen, to which it traces in my key (Tr. Royal Can. Inst., XV. 252, 1926). It is readily distinguished by the wholly black posterior femora, presence of abundant erect black hair on the upper surface of the anterior tarsi and in having the basal segment of the anterior tarsi shorter than the following three segments instead of longer than the apical four segments. Length 4.75 mm.
1 —Since the above article was prepared information has come to hand that in freshly emerged specimens the wings are entire and that the loss of the wing membrane occurs later. Ed.
