158 



U. S. NATIONAL MUSEUM BULLETIN 216 



tip of lower valve of ovipositor rather abruptly tapered posteriorly, 

 with about six vertical ridges (fig. 330, h). 



This group includes the one Holarctic species described below. 



19. Dolichomitus sericeus (Hartig), new combination 



Figukes 330,h; 333,o; 358 



Closlerocerus sericeus Hartig, 1847, Ber. Naturw. Ver. Hartz for 1840, p. 18; 

 d". Type: <?, Claus Valley, Hartz Mts., Germany (lost). 



Male: Front wing 9.1 to 11.5 mm. long; face of moderate width, 

 with fine, dense, sharp punctures; median segments of flagellum 

 strongly swollen and slightly flattened, the swelling including about 

 the seventh to nineteenth segments, the greatest swelling on about 

 the thirteenth to seventeenth segments, which are about 0.85 as long 

 as wide and about twice as wide as the basal flagellar segments; first 

 trochanter of front leg concave anteroventrally ; outer side of middle 

 coxa with fine dense hairs, concave but with a postmedian transverse 

 compressed tubercle; first tergite about 1.75 as long as wide; second 

 tergite about 1.55 as long as wide; subgenital plate as in figure 333, o ; 

 genitalia large, as in figure 358. 



Figure 6G. — Localities for 

 Dolichomitus sericeus. 



Black. Clypeus and mandible ferruginous; large spot on under 

 side of scape pale yellow; swollen part of flagellum stramineous below, 

 brown above, the incisures between the wider segments with a median 

 blackish spot extended laterally as a black stripe; palpi and tegula 

 white; front and middle legs light fulvous, their front side, trochan- 

 ters and front tarsus entirely, and the basal 0.2 of their tibiae pale 

 yellow, the middle tarsus somewhat brownish; hind coxa fulvous; 

 hind trochanters pale yellow; hind femur fulvous, infuscate above 

 and apicalTy; hind tibia brown, its underside and basal 0.2 stramineous; 

 hind tarsus brown. 



