190 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Crassiseta conjuncta, n. sp. 



Front moderately broad, not projecting, opaque yellow, with 

 a mixture of small black and yellowish bristles, frontal triangle 

 narrow, reaching the antennae, shining yellow, ocellar dot 

 brownish black ; face yellow, orbits silvery pollinose, with a 

 pair of blackish vibrisssp ; cheeks narrow, yellow, silvery pol- 

 linose, with a few small, blackish bristles ; occiput yellow, sil- 

 very pollinose below, with two divergent brown marks above ; 

 antenn^Tp yellow, second joint with several small, yellowish 

 bristles and a larger black one, arista black, two jointed ; 

 mouth-parts wholly yellow. Thorax yellow ; mesonotum, ex- 

 cept humeri and broadly on sides, black, thin coat of micro- 

 scopic, yellowish hairs, short pile yellow, two posthumeral and 

 two supraalar bristles black ; scutellum black on dorsum, mi- 

 croscopic hairs and longer pile yellow, a pair of tubercles on 

 apex and two smaller ones on each side, each bearing a blackish 

 bristle, the apical pair being the largest; halteres yellow; 

 pleuriTe largely shining. First and second segments of abdo- 

 men ankylosed, the second very large, deeply concave ante- 

 riorly for the reception of the convex first segment, these two 

 segments compose most of the abdomen, posterior angles of 

 second very prominent, lateral margins of both and posterior 

 border of second black, following segments short, and decreas- 

 ing in width very rapidly, shining black ; sparse pile yellow. 

 Legs yellow, front tarsi largely, and last two joints of middle 

 and hind tarsi black. Wings hyaline, second section of costa a 

 little shorter than the third. Length, 2.5 mm. 



Two specimens ; February and April. 



Crassiseta atricornis, n. sp. 



Front opaque, brownish black, anterior part yellowish, orbits 

 somewhat grayish, small black bristly hairs on sides and an- 

 terior part, triangle shining black, reaching two-thirds way to 

 antennae, ocellar dot grayish pubescent; face excavated, black- 

 ish, vibrissa^ present; cheeks narrow, oral margins projecting, 

 with a faint yellowish cast; occiput black, grayish pubescent; 

 antennae wholly black ; mouth-parts yellowish. Thorax black, 

 largely shining, with one humeral, two posthumeral, and two 

 supraalar bristles; mesonotum and scutellum with "a uniform 

 grayish coat, latter with two long and two short bristles, hal- 

 teres yellow. Abdomen black, subopaque. Legs wholly black. 



