222 KANSAS UNIVERSITY SCIENCE BULLETIN. 



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boscis long, the distal portion curving downward. Thorax shining black; pile, 

 which is most prominent on the mesonotum, white; a small spot on humeri and 

 sometimes a very narrow line extending half-way to base of wing, white; halteres 

 white, with base of peduncle brownish black. Abdomen wholly white, except a 

 rather long transverse black stripe on fifth segment. Legs black; tip of femora, 

 base and tip of tibse, and tarsi, except last joint, which is brown, yellow. Wings 

 hyaline, larger veins yellowish translucent, third vein forked. 



Female, Similar to the male, except in following particulars: Front is 

 sometimes without white markings, other specimens have two white dots later- 

 ally at anterior end; abdomen black, lateral margins, a triangular spot on second, 

 third, and fourth segments, posterior margin of last segment, and a median row 

 of email dots on venter, white. Length, 5.5 mm. 



Numerous specimens of each sex, Englewood, Clark county, Kansas. Col- 

 lected during June, 1903, by Dr. F. H. Snow. 



. Psilocephala acuta, n. sp. 



Female. Head yellow, opaque; ocellar tubercle unusually prominent, front 

 in profile slightly excavated, with a small median fissure on lower half, two 

 velvety black spots on lower half next to eyes; pile black, face with a black spot 

 near lower angle of eye; antennae yellow, first joint about as long as the third, 

 bristles black, second joint nearly as broad as the first, third pear-shaped, 

 slightly broader than the first, base and arista brownish black, palpi yellow, 

 with black pile, proboscis brownish; cheeks thickly covered with white pollen 

 and pile, bristles of occiput black; upper and lower angles of eyes acute. Tho- 

 rax yellow pollinose, two median brownish lines on mesonotum abbreviated be- 

 hind, two sublateral ones abbreviated anteriorly, pile white, bristles of mesonotum, 

 metapleura? and scutellum black, the latter two in number; halteres yellowish 

 white, with a blackish spot at junction of peduncle and knob. Abdomen brown- 

 ish, apex of segments yellow, subopaque, sparse pile white and black, venter 

 largely brownish. Legs yellow; trochanters, an indefinite ring at apex of fem- 

 ora, extreme tip of tibia?, tip of first two tarsal joints, and last three joints 

 wholly brown; pile white, bristles black. Wings hyaline, veins black, most of 

 the cells on basal and anterior part occupied largely by grayish brown; in last 

 four posterior cells the grayish brown is not so intense; a small spot on humeral 

 cross-vein, one at base of second vein, and one at apex of first vein black; fourth 

 posterior cell broadly open. 



Male. A black spot at apex of frontal triangle, dorsum of abdomen light 

 yellow, pile white, venter largely yellowish, hind coxa? and all femora largely 

 brownish, wings nearly wholly hyaline, small grayish-brown spot in marginal, 

 eubmarginal, posterior and anal cells; otherwise agrees with the female. 

 Length, 8 mm. 



One male and several females, Englewood, Clark county, Kansas. Collected 

 during June, 1903, by Dr. F. H. Snow. 



Microdon lanceolatum, n. sp. 



Male. Head black, subshining, covered with brownish-yellow pile; eyes 

 bare; antennte black, first joint equal to the second and third together in length, 

 second about half as long as the third, third, when viewed from the side, lanceo- 

 late, from above subconical, arista basal, nearly as long as the third antennal 

 joint, brownish black at base, yellowish on apical two-thirds; mouth-parts 

 brownish. Thorax black, subshining, mesonotum and scutellum thickly brown- 

 ish yellow pilose, pleura? sparsely so, scutellum without spines, halteres yellow. 



