188 



U. S. NATIONAL MUSEUM BULLETIN 216 



Calif.; and October 22 at Cultus Lake, B. C. The earliest seasonal 

 record for eastern North America is June 12 at Ottawa, Ont. One 

 specimen is labeled as reared from Heterarthrus nemoratus at Bar 

 Harbor, Maine, July 5 to 20, 1937. 



Judging from our own collecting experience and from the data 

 on other collectors' specimens, the species is common in cool moist 

 woods, such as occur on the higher mountains, and is practically 

 absent from drier situations. 



This subspecies is transcontinental in the Canadian and Transition 

 zones. It occurs in cool moist woods, the adults flying from late 

 spring to early fall. 



5. Exochus russeus, new species 



Figures 188,d; 191, e 



Front wing 3.7 to 5.0 mm. long; lower edge of metapleurum produced 

 ventrad as a lamella about 0.55 as deep as long; costula complete; 

 median longitudinal carinae of propodeum obsolescent apicad of basal 

 transverse carina, not reaching position of apical transverse carina; 

 apical transverse carina strong between pleural and lateral longi- 

 tudinal carinae, present mesad of lateral longitudinal carina as a 

 short stub, absent elsewhere; first abdominal tergite about 1.30 as 

 long as wide in male, about 1.22 as long as wide in female. 



Head black, the face, frontal orbit (extending to and expanded at 

 top of eye), cheek, lower 0.75 ± of hind orbit, clypeus, and mouth 

 parts, ivory; antenna black, the scape and pedicel brownish below; 

 pro thorax black, the upper edge of pronotum broadly ivory; meso- 

 thorax, metathorax, and propodeum ferruginous; most of prepectus 

 and sutures, especially around scutellum, postscutellum, and wing 

 bases, black; vertical spot on prepectus, subtegular ridge, postscutel- 



Figures 110, 111. — Localities: 110 (left), Exochus russeus; 111 (right), E. enodis. 



