560 



U. S. NATIONAL MUSEUM BULLETIN 216 



National Park, N. S.; and August 21 at the Cascapedia River, Que. 

 In our collecting we have found the species in forests of Picea and 

 Abies. 



This species is in the Canadian zone of the East. Adults occur 

 mostly from late spring to mid-summer. 



2. Genus Mesoclistus 



Figure 308,b 



Mesoclistus Foerster, 1868, Verh. Naturh. Ver. Rheinlande, vol. 25, p. 168. 

 Type: Acoenites rufipes Gravenhor&t; included by Schmiedeknecht, 1888. 



The more important generic characters are stated in the key. 

 This is a small, Holarctic genus, with one Nearctic representative 

 in Alaska. 



1. Mesoclistus cushmani, new species 



Front wing 8.1 to 8.6 mm. long; cheek about 0.90 as long as basal 

 width of mandible; punctures on mesopleurum medially subadjacent 

 and confused with weak wrinkling, marginally separated by about 0.7 

 their diameter; petiolar area of propodeum completely covered with 

 fine wrinkles ; hairs on third tergite rather uniformly dense ; ovipositor 

 sheath 1.15 as long as front wing. 



Figure 272. — Locality for 



Mesoclistus cushmani. 



Black. Under side of male scape and basal four segments of 

 flagellum brown; under side of basal third of female flagellum tinged 

 with brown; tegula blackish; legs beyond trochanters fulvous, the 

 apex of hind tibia infuscate and hind tarsus blackish brown; wings 

 tinged with dark brown. 



As differentiated from the European Mesoclistus rufipes, this species 

 has a longer cheek, finer and denser punctation, more wrinkling on 

 thorax, denser hairs on tergites, no whitish marks on head, and 

 female hind coxa black. 



