488 U. S. NATIONAL MUSETJM BULLETIN 216 part 3 



1. Echthrus abdominalis Cresson 



Front wing of male 7.5 to 13.3 mm. long, of female 9.4 to 15.5 mm. 

 long; clypeus rather flat, but apically impressed on each side to form 

 a large, broadly triangular median point; mesoscutal punctures 

 separated on the average by about 0.7 their diameter; inflated portion 

 of female front tibia dorsally with a weak median longitudinal trough, 

 the swelling asymmetric, its hind side shorter and more protuberant 

 than front side; second and following tergites smooth, uniformly mat, 

 the hair sockets on second tergite separated by about 1.2 the length 

 of the hairs, somewhat denser on third and following tergites; 

 ovipositor tip with its lower valve enclosing only the lower 0.3 it of 

 upper valve. 



The species abdominalis is transcontinental in the Canadian and 

 Transition zones. There are four subspecies, as keyed and described 

 below. The account below leaves out of consideration a male and 

 female from Wyoming, which may represent a fifth subspecies. 

 The female is black, with fulvous legs, an incomplete white band 

 covering 3 flagellar segments, scape black, and wings faintly infuscate. 

 The male is colored the same, but lacks the flagellar band and has 

 front of scape, vague spot on lower part of facial orbit, cheek at base 

 of mandible, and subbasal part of mandible stramineous. Data on 

 these two are: 9, Canyon Junction, Yellowstone National Park, July 

 28, 1957, Gerald Proctor (East Lansing), cf. Powder River Pass at 

 9,000 ft., Wyo., June 30, 1940, H. and M. Townes (Townes). 



Our collections of the species have always been in woods containing 

 northern conifers. 



The subspecies may be distinguished as follows: 



1. Coxae and trochanters black or piceous; wings somewhat infuscate; range: 



central and southern Rocky IMountains. 



Id. abdominalis infuscus, new subspecies 

 Coxae and trochanters fulvous; wings with a weak brownish tinge .... 2 



2. Males 3 



Females 6 



3. Abdomen partly to entirely fulvous; range: Alberta and British Columbia to 



Wyoming and central California. 



la. abdominalis vanconverensis (Bradley), some specimens 

 Abdomen entirely black 4 



4. Range: Atlantic Ocean to Michigan . lb. abdominalis abdominalis Cresson 

 Range: Pacific Ocean to Rocky Mountains 5 



5. Range: California in the San Francisco area. 



Ic. abdominalis dimidiatus, new subspecies 

 Range: Montana and British Columbia to Oregon. 



la. abdominalis vanconverensis (Bradley), some specimens 



6. Scape fulvous in front; abdomen entirely fulvous; range: Alberta and British 



Columbia to Wyoming and central California. 



la. abdominalis vanconverensis (Bradley) 

 Scape piceous or black in front 7 



