314 A. L. MELANDER. 



Em pis infuinata Coquillett. 

 Proc. Wash. Acad. Sci., 1900, p. 409. 



Same a'ifumida, except that the palpi and horny parts of the proboscis are yel- 

 low, central filament of hypopygium of male free, except at the apex, no fringe 

 nor cluster of spinous bristles on ventral portion of the fifth or other abdominal 

 segments, hind femora destitute of spinous bristles on the under side, at most 

 with a few weak bristles on the apical fourth. 5 mm. 



Alaska. 



KnipiK csBligena sp. nov. {Fig. 107). 

 Male. — Ground color black, silvery gray pollinose. Eyes wine color, contigu- 

 ous for about one-third of the distance between the antennae and the ocelli, facets 

 uniformly small; palpi pale fuscous, short, extending straight forward, with 

 numerous long black hairs below, proboscis not twice the head-height in length, 

 slender, reddish at the base, black apically; antennae a little longer than the 

 head-height, black, first and second joints short, provided with black hairs, sec- 

 ond joint one-half the length of the first, third joint slender, beyond the basal 

 fourth of almost equal thickness, blunt at the tip, the arista small, one-eighth as 

 long as the third joint ; occiput cinereous, with numerous black hairs indistinctly, 

 irregularly arranged in three transverse rows, the lower occiput bare in the mid- 

 dle. Thorax gray dusted, not at all tinged with brown, the usual four vittae of 

 the dorsum black, not brown, broadly bordering the two outer vittfe are rather 

 long hairs, the marginal bristles of the dorsum not rcai'kedly thicker than the 

 other hairs, humeri with rather long hairs, pronotal collar consi.'sting of short 

 hairs, above the base of each coxa is a small bunch of hairs, the prehalteral row 

 consisting of twelve hairs, scutellum with about twelve marginal bristles. Abdo- 

 men short, robust, deflected at the tip, with silvery-gray pollen, not silky in lus- 

 tre, with long fine hairs, especially noticeable on the sides of the basal segments ; 

 antepenultimate ventral segment with a short, broad, median bifurcate process, 

 lateral to which the posterior margin of the segment is emarginate, sixth ventral 

 segment small, hidden by the fifth and the last ; hypopygium small, but robust, 

 closed, middle lamellae large, almost cordiform with the emargination above, en- 

 veloping nearly the vyhole of the hypopygium, upper lamellae small, central fila- 

 ment completely hidden. Coxae black, cinereous, paler apically, front and mid- 

 dle ones with numerous fine black hairs on the forward side, hind ones with a 

 few long hairs on the inner and outer sides ; legs simple, fuscous, extreme tip of 

 the femora and the tarsi darker, tarsi almost black ; legs wholly covered with 

 long and rather dense black hairs, short, dense and almost bristle-like on the 

 plantar surface of the tarsi, femora stout, but not thickened, hind ones reaching 

 beyond the end of the abdomen, hind tibiae slightly thicker than their femora, 

 the other tibiae more slender; metatarsi not thickened, front ones as long as the 

 two following joints, middle ones equal to the next, hind ones somewhat shorter, 

 than the next two joints; pul villi grayish, not enlarged. Halteres pale yellow. 

 Wings hyaline, with a faint brownish tinge, stigma nearly obsolete, veins strong, 

 fuscous; discal cell short, broad, the first section of the fourth vein bounding it 

 anteriorly, but slightly less than two-thirds the length of the second section ; fur- 

 cation of the third vein takes place beyond the end of the marginal cell, the pos- 

 terior branch ending just in advance of the extreme wing-tip; twice the length 

 of the anterior branch ; two rather long bristles present near the base of the costa. 



