278 THE CANADIAN ENTOMOLOGIST. 



and a basal one on each side of the third, fourtli and fifth abdominal 

 segments, black ; a brown dorsal line on the last three abdominal 

 segments, and indications of one on the mesonotum ; two pairs of 

 dorso-centrals, no acrostichals, one sternopleural macrochaeta ; 

 third antennal joint oval, one and one-half times as long as wide. 

 Length, 3 mm. Biscayne Bay, Fla. A female specimen collected 

 by Mrs, A. T. Slosson. Type No. 4085 Slossonce, n. sp. 



4. Mesonotum opaque black or yellowish 5. 



Mesonotum polished black ; black, highly polished, the first two 



antennal joints, base and lower edge of the third, base of arista, 

 lower edge of front above the antennas, halteres, femora, tibise, 

 middle and hind tarsi and base of first joint of the front ones, also 

 the front coxge, yellow ; four pairs of dorso-centrals, one of acrosti- 

 chals, and one sternopleural macrochfeta ; third antennal joint 

 scarcely tapering toward the tip, two and one-half times as long as 

 broad, arista short plumose, wings strongly tinged with yellow. 

 Length, 4 mm. Vancouver Island, British Columbia. Two 

 male specimens collected by Mr. C. Livingston. Type No. 

 4086 Livingsto7ii, n. sp. 



5. With three pairs of dorso-central and two sternopleural macrochsetse. 6. 

 With only two pairs of dorso-central and one sternopleural macro- 



chfeta ; yellow, the front except the lower edge, the mesonotum, 

 scutellum, metanotum, and a vitta on upper part of the pleura, 

 black, opaque bluish-gray pruinose, a black spot on each side of 

 the third, fourth, fifth and sixth segments of the abdomen ; third 

 joint of the antennas oval, one and one-half times as long as wide, 

 arista long plumose. Length, 3 mm. Onaga, Kansas. A 

 female specimen collected by Mr. F. F. Crevecoeur. Type No. 

 4087 Crevecoeuri, n. sp. 



6. Antennal arista long plumose, body very robust, wings tinged with 



yellow, scarcely more than twice as long as the abdomen 7. 



Antennal arista bare, body slender, wings unusually long, over four 

 times as long as the abdomen ; black, gray pruinose ; the antennae) 

 front legs, and middle and hind femora, brown ; middle and hind 

 tibial and their tarsi, yellow, halteres whitish ; wings not tinged 

 with yellow, third antennal joint only slightly tapering toward its 

 tip, nearly twice as long as wide. Length, 3.5 mm. White Mts., 

 N. H. One male and five females, collected by the late H. K. 

 Morrison. Type No. 4088 brac/iysoma, n. sp. 



