40 



U. S. NATIONAL MUSEUM BULLETIN 216 



Black. Face, clypeus, front part of cheek, and mandible, pale 

 yellow in male, ferruginous in female, the face of female more or 

 less yellowish dorsally; face with brownish crescent next to each 

 antennal socket; palpi, base of tegula, apex of femora, and basal 0.2 of 

 tibiae, pale yellow; front and middle tarsi basally yellowish; upper 

 face of front and middle tibiae of male entirely yellow; antenna dark 

 brown, a little paler below; tegula fulvous, yellow at base; legs fulvous 

 except as described otherwise; side of abdomen usually tinged with 

 ferruginous, especially in females. 



Figures 18, 19. — Localities: 18 (left), Trieces flavifrons; 19 (right), T. tegularis. 



Specimens: 9, Hartford, Conn., May 12, 1894 (Washington). 

 cf , South Meriden, Conn., July 12, 1938, Harry L. Johnson (Townes). 

 29, Fort Collins, Colo., June 15, 1896, and "June," C. F. Baker 

 (Washington). 9, Lawrence, Kans., June 23, 1900, H. Kahl (Pitts- 

 burg). 9, Riley Co., Kans., July 14 (Townes). d\ Van Auken Lake, 

 Van Buren Co., Mich., July 16, 1939, W. H. Burt (Ann Arbor). 

 0% Houston Co., Minn., May 29, 1939, Philip Marvin (St. Paul). 

 9, Canning, S. Dak., July 15, 1945, H. C. Severin (Townes). d\ 

 Chester, S. Dak., June 17, 1930, G. I. Gilbertson (Townes). d\ Hot 

 Springs, S. Dak., July 14, 1924 (Washington), cf , Milwaukee, Wis., 

 Graenicher (Cambridge). 9 (type), Wisconsin (Washington). 



This species ranges from Connecticut to South Dakota, south to 

 Colorado and Kansas. Judging from its color, structure, and distri- 

 bution, it probably occurs in rather open dry habitats. 



4. Trieces tegularis, new species 



Figures 179,a; 180,d 

 Female type: Front wing 3.8 mm. long; face 1.5 as wide as high, its 

 punctures of moderate size, sharp, separated by about 0.25 their 

 diameter; face and clypeus in profile weakly convex; attachment of 



