42 



U. S. NATIONAL MUSEUM BULLETIN 216 



Black. A lateral, vertical, elliptical area on each side of face yel- 

 lowish; mouth parts and apical margin of clypeus brown; tegula 

 brown, yellow basally; apex of femora and basal 0.2 of tibiae stra- 

 mineous; coxae, trochanters, and middle and hind femora (except at 

 apex), blackish; front femur (except at apex) brown, darker basally; 

 tibiae except on basal 0.2, and tarsi brown. 



Type: 9, Echo Lake, Eldorado Co., Calif., July 14, 1951, W. W. 

 Middlekauff (Berkeley). 



Paratypes: d\ Golden, Colo., May 29 (Washington). 9, Green 

 Mt., Golden, Colo., May 24, 1919, L. O. Jackson (Townes). 9, 

 Aweme, Man., May 28, 1925, R. D. Bird (Ottawa). 



6. Trieces densus, new species 



Figure 180,f 



Front wing 3.7 to 3.8 mm. long; face about 1.3 as wide as high, its 

 punctures coarse, sharp, subadjacent; face and clypeus in profile 

 moderately convex; attachment of front tentorial arm visible as a 

 brownish ellipse around clypeal fovea with a linear projection mesad 

 along the clypeal suture; eye apparently bare; flagellum with 28 seg- 

 ments in male, with 26 segments in female; metapleurum with a 

 wedge-shaped group of about 15 hairs in its upper hind part and its 

 upper front corner margined by a small crescentic group of hairs: 

 striae of metapleurum moderately coarse, covering about 0.3 of its 

 area near the hind coxa; propodeal spiracle elliptic, somewhat distant 

 from pleural carina but connected to it by a raised area; front spur 

 of middle tibia about 0.44 as long as hind spur; second segment of 

 middle tarsus 2.0 as long as wide in male, 1.7 as long as wide in female; 

 second abdominal tergite 0.87 as long as wide in male, 0.81 as long as 

 wide in female, with close, rather coarse punctures; sublateral longi- 

 tudinal carina of third tergite extending about 0.45 its length. 



Figures 20, 21. — Localities 20 (left), Trieces teres; 21 (right), T. densw. 



