Peradon bispina

Diagnosis
Body length 8.5–11.5 mm. A small, slender, black species of the bidens group, of which only males are known. The wings are infuscate and there is a narrow yellow marking on cell r4+5 between the apical part of the vena spuria and vein M posterior to it (Fig. 37). This separates the species from similar species, in which the yellow wing marking is either absent or situated in a different part of the wing.

Distribution
Brazil