2o6 KANSAS UNIVERSITY QUARTERLY. 



Platypeza unicolor, n. sp. 



Female. Black, opaque. Head, antennae, palpi, halteres, and 

 legs concolorous. Face and front slightly and obscurely cinereous; 

 the latter on the sides with short black pile, which, just behind the 

 antennae, extends nearly across the middle. Face bare except 

 some black pile just above the epistoma; cheeks pilose. Thorax and 

 scutellum fuscous black. The latter with several marginal bristles. 

 Abdomen velvety black, immaculate. Legs altogether black or fus- 

 cous black; hind tarsi enlarged, compressed, similar to Figs. 4, 5 in 

 Plate 12 accompanying the former article, but differing in being 

 wholly black, and in having a larger fourth joint. Wings slightly 



cinereous; small crossvein further removed from the base of the discal 

 cell than in the preceding species but not nearly so far as in pulla n. 

 sp., or in other words, the costal cell is one-third longer than the 

 first basal cell; anal cell about twice the length of the second basal 

 cell; the posterior crossvein is near the border of the vving; anterior 

 branch of the fourth vein strongly arcuate, posterior branch short, 

 first posterior cell about equal to the length of the prefurca. 



Length 3 mm. 



One specimen, Moscow, Idaho (Prof. Aldrich). 



This specimen is similar to an/Iircix, vclttttjut, ahscoiidita and pulla. 

 It differs apparently from anthrax in that the face is bare except for 

 a small tuft of pile just above the oral opening; it has no rufescent 

 borders to the abdominal segments, the knees are not pallid, the small 

 crossvein is much less remote from the base of the wing, and the 

 second posterior cell is shorter and wider. From velutina it may be 

 separated by the wings which are not "purissime hyaline," and by 

 the entirely black, not at all lurid legs. Loew does not mention 

 any pile on the face of velutina. Abscondita is different from the 

 present species in its bare face and in tlie extreme length of the pos- 

 terior branch of the fourth vein. Pulla is also distinct in its facial 

 and neurational characters. 



Platypeza pulla, n. sp. 



Platypeza velutina Snow (non Loew) Kan. Univ. Quar., Vol. Ill, 



P- M3- 



Certain specimens described in a former paper (1. c.) under the 

 name velutina Lw. require a new name. They may be distinguished 

 from Loew's species by the color of the wings which are slightly yel- 

 lowish cinereous, and by the greater length of the first basal and 

 the second posterior cells. The sides of the face are broadly cov- 

 ered with long thick pile. The present species resembles anthrax 

 Lw. in its venation, having extremely long first basal and second 



