THE MYCETOPHILID.i; OE NORTH AMERICA. 245 



segment and the anterior part of the fifth reddish yellow; 

 remaining segments black ; the hypopygium reddish, with 

 whitish pubescence; abdomen shining. Coxae and legs (the 

 hind pair is wanting) light yellow; tibiae inftiscated by the 

 minute black hair ; tarsi blackish ; middle and front tibiae with 

 short spinules. Wings hyaline, the tip and posterior border 

 infuscated; a narrow brown cloud covers the tip of Ri and 

 reaches into the base of the cell R^+s; subcostal crossvein only 

 a little distance beyond the humeral crossvein; tip of subcostal 

 vein beyond the origin of the radial sector; R2+3 terminates in 

 Ri near its tip ; prefurca of media very short. Anal vein com- 

 plete. Washington. 



5. Apemon nigriventris n. sp. 

 Male and female. Length 7^ to 8|- mm. Head, including 

 scape of antennae, thorax, abdomen including venter, genitalia, 

 and margin of the trochanters subshining black; palpi, coxae, 

 femora and halteres reddish yellow, tibiae dull yellow, spurs a 

 little paler, tarsi fuscous. Hairs of thorax, pale yellow, 

 arranged in 3 longitudinal lines and along the lateral margins; 

 hairs on humeri, scattering hairs on venter and hypopygium 

 pale, elsewhere on head, thorax and abdomen black; those on 

 the coxae and femora pale, on tibiae and tarsi black, setae of the 

 former very minute, scarcely differentiated from the hairs. 

 Intermediate antennal joints but little longer than wide. The 

 fore metatarsus of the male 0.75 as long as its tibia, in the 

 female about 0.7; tarsal claws toothed, setose on basal half, 

 empodium brush-like, as long as the claws. Wing of the male 

 very faintly smoky; of the female more distinctly smoky on 

 apical half; veins dark brown ; R4+5 ends very close to the tip 

 of the costa but noticeably before the apex of the wing; sub- 

 costa ends about the length of R3+3 distad of the base of the 

 radial sector; the subcostal crossvein is situated about twice 

 its length distad of the humeral crossvein ; R:+3 makes about a 

 45° angle and ends in Ri very close to its apex; petiole of the 

 media is shorter than the coalesced section of the media; the 

 fold-like basal section of this vein is hyaline ; anal vein sinuous, 

 and reaches the margin of the wing. Three specimens collected 

 in July by Mr. J. C. Bradley. Selkirk Mts.. Rogers Pass. B, 

 C. 4600 ft. altitude : and Trarie Hill. B. C. 5800 ft. altitude. 



