150 KANSAS UNIVERSITY QUARTERLY. 



tarsus a little longer and wider than any following joint. Halteres 

 luteous. Wings broad, lightly tinged with yellowish, veins fuscous; 

 first and third basal cells subequal, very short, about one-half length of 

 second costal cell; posterior crossvein removed from the border of 

 wing on fifth vein by as much as the length of second posterior cell; 

 second posterior cell very short; first posterior cell narrowly open. 



Length 3 mm. 



Three specimens, Hop Canyon, Magdalena Mts., N. M., in Au- 

 gust; 7,500-8,500 feet. 



Platypeza egreg-ia n. sp.— PI. 12, figs 4 and 5, 



Female. Cinereous, opaque. Head concolorous; antennae black; 

 proboscis and palpi dilutely lutescent. Humeri brownish; dorsum of 

 thorax with four fuscous stripes, the lateral ones abbreviated anteri- 

 orly and less distinct than the approximate intermediate pair; the 

 latter shortened behind. First segment of abdomen cinereous, 

 opaque, beneath the scutellum, opaque black; segments two to six in 

 front with opaque black bands greatly widened in middle, triangular; 

 triangle of third segment largest, of sixth very small. Pile light at 

 base of abdomen changing to black on posterior segments. Legs 

 sublutescent, femora and last tarsal joints infuscate; first two 

 joints of hind tarsi (PI. 12, fig. 4 outside; fig. 5, inside) on inside with 

 short, thick, yellowish pile; on outside of these joints and on remain- 

 ing joints, the pubescence is black; third and fourth joints on outside 

 with wide, shallow depression as in/*, calceata, female (PI, 12, fig. 3); 

 fourth joint truncate at distal end. Halteres dilutely lutescent. 

 Wings hyaline, with very slight fuscous tinge, veins fuscous; second 

 costal cell twice as broad and nearly twice as long as first basal cell; 

 posterior crossvein far removed from border of wing; posterior 

 branch of fourth vein long; second posterior cell short. 



Length 3)^ mm. 



One specimen. Hop Canyon, Magdalena Mts., N. M., in August; 

 about 8,000 feet. 



Platypeza cinerea n. sp. 



Female. Cinereous. Head concolorous; antennae black, with 

 slight cinereous pubescence; proboscis and palpi lutescent; pile of 

 head black. Thorax cinereous, more fuscous on dorsum; two medi- 

 an dorsal fuscous stripes and two wider, poorly defined stripes on the 

 side, abbreviated in front; humeri brownish. Abdomen cinereous, 

 banded with opaque black; first segment cinereous except on sides 

 and hind margin where it is black opaque; segments 2-4 with opaque 

 black bands on their posterior borders, widened in middle and reach- 

 ing anterior margin of their segment; pile of body black. Legs 



