46 



U. S. NATIONAL MUSEUM BULLETIN 216 



II. INTEGER GROUP 



Eye bare or with hair of various lengths and density; metapleurura 

 bare of hairs except often for a very few in its extreme upper front 

 corner and rarely one to three discal hairs of random distribution 

 (figs. 181, a to 182, a). Otherwise similar to the texanus group. 



This group includes the nine Nearctic species described below, T. 

 platysoma Townes 1946, from Mexico, and an undescribed species 

 from southern Brazil. 



9. Trieces ejectus, new species 



Figure 181, a 



Male type: Front wing 4.2 mm. long; face 1.1 as wide as high, with 

 moderate-sized sharp punctures, their interspaces about 0.5 their 

 diameter; face and clypeus in profile moderately convex; attachment 

 of front tentorial arm visible as a dark curved mark crossing the 

 clypeal fovea, extending a long distance dorsomesad of the fovea and 

 a short distance ventrolaterad ; eye with short sparse hairs; flagellum 

 with 31 segments; front spur of middle tibia 0.50 as long as hind spur; 

 second segment of middle tarsus 2.25 as long as wide; metapleurum 

 without hairs, with rather close sharp wrinkles that occupy all but 

 its front upper part and its anterior 0.25. 



Black. Face, lower lateral part of frons to just below center of 

 eye emargination, cheek, clypeus, front and middle trochanters, and 

 tibial spurs yellowish white; clypeal fovea and attachment of front 

 tentorial arm brown; flagellum brown beneath, blackish brown above; 

 tegula brown with a basal whitish spot; front and middle coxae 

 yellowish white, fulvous basally; front and middle femora fulvous, 

 pale yellow at apex; front and middle tibiae pale fulvous, yellowish 



Figures 25, 26. — Localities: 25 (left), Trieces ejectus; 26 (right), T. zvalleyi. 



