Hypolæpus Viereckii, sp. nov.—Dark, abdomen whit beneath, legs partly white, wings hyaline, nervures whit at base. Length, 7–8 mm.

♀. — Head shining black; face below the insertion of the antennæ, a narrow band between the antennæ and the eyes, head above the eyes, and the temples, white; antennæ black, nine-jointed, third slightly arcuate, thicker and longer than the fourth, which is in turn longer than the fifth, and so on to the last. Thorax shining black, laterally in front of wings white; wings hyaline, nervures brown, whitish at base of wing; first transverse cubitus transparent, without colour, second submarginal cell receiving two recurrent nervures, lanceolate cell petiolate, only one marginal cell; legs dark brown, all coxæ and trochanters, tibiæ execpt tips and basal third of posterior femora, white; posterior tibiæ slightly enlarged, longitudinally sulcate, first joint of posterior tarsi as long as the other three combined, the last joint being especially short.