462 TJ. S. NATIONAL MUSEUM BULLETIN 216 



lower half with sparser punctures and the hairs a little longer, near the 

 lower 0.3 the punctures being separated by about 3.5 their diameter; 

 second segment of middle tarsus about 1.1 as long as deep; fifth 

 segment of hind tarsus about 1.58 as long as second segment; second 

 tergite rather strongly rugulose, somewhat smoother apically, its 

 punctures rather small, rather sharp, dense, and only partially 

 obscured by the rugulosity; ovipositor sheath about 1.35 as long as 

 front wing. 



Coloration entirely deep black; wings weakly infuscate. 



The female of this species has both the legs and abdomen black and 

 the mesoscutal punctures very dense. Our only other species with 

 this color in the female is dreisbachi, which has the mesoscutal punc- 

 tures very sparse. 



Specimens (29 c?, 99): From Alberta (Waterton); British Columbia 

 (Robson); California (Colusa, Echo Lake at 7,400 ft., near Glacier 

 Point in Yosemite National Park, Hope Valley in Alpine Co., and 

 Tamarack Flat in Yosemite National Park) ; Colorado ; Idaho (Head- 

 quarters); and Montana (Lake McDonald in Glacier National Park). 



Collection dates are mostly in July, but range from June 19 (at 

 Waterton, Alta.) to August 29 (at Robson, B. C). We once found 

 the species moderately common around trunks of Pinus contorta that 

 had been killed by Dendroctonus. 



This species occurs in the Canadian zone of the Rocky Mountains 

 and the Sierra Nevada. 



9. Odontocolon abdominale (Cresson) 



Male: Front wing 4.5 to 7.3 mm. long; first segment of flagellum 

 about 1.2 as long as second segment; punctures on mesoscutum small, 

 sharp, separated by about 2.0 their diameter; propodeal teeth weak, 

 about 0.3 as long as their basal width; punctures on hind femur 

 rather dense, their interspaces about 1.5 their diameter, a little 

 sparser near lower edge of femur; second segment of middle tarsus 

 about 3.2 as long as deep; fifth segment of hind tarsus about 0.90 as 

 long as second segment; second tergite smooth, faintly mat, its punc- 

 tures very fine, evenly covered with hairs the sockets of which are 

 separated by about 0.85 their length. 



Female: Front wing 5.8 to 10.0 mm. long; flagellum with about 

 34 segments, its first segment about 1.43 as long as second; head 

 about 1.01 as wide across temples as across eyes; punctures on temple 

 moderately small, separated by about 1.5 their diameter; thorax 

 about 2.25 as long as high; upper 0.35 ± of pronotum with moderate- 

 sized sharp punctures that are separated by about 0.8 their diameter; 

 trough of pronotum crossed at right angles by about 14 strong ridges; 

 punctures on mesoscutum small, dense, separated by about 0.8 their 



