ICHNEUMON-FLIES OF AMERICA: 1. METOPIESTAE 199 



and Canadian faunas, the palest specimens being from the Carolinian 

 and darkest from the Canadian. Below are descriptions of a typical 

 pale male and a typical dark male. Intermediates are abundant. 



Pale male: Black. Face, side of frons in its lower half, triangle 

 at top of eye, cheek, lower 1.4 of temple, clypeus, mouth parts, under 

 half of scape and pedicel, lower corner and upper hind half of pro- 

 notum, propleurum except above, tegula, subtegular ridge, mesoster- 

 num, lower 0.25 and front lower part of mesopleurum, and front and 

 middle legs, yellow, the area of the sternaulus and front and middle 

 femora behind, fulvous; hind legs fulvous, the tarsus and the tibia sub- 

 basally tinged with yellow, and the tibia faintly infuscate at base and 

 apex. 



Dark male: Black. Face, triangle at top of eye, cheek, temple below, 

 mouth parts, under side of scape, hind corner of pronotum, pro- 

 pleurum next to its coxa, tegula, subtegular ridge, large vertical 

 elliptical spot on prepectus, and front and middle coxae and tro- 

 chanters, yellow; front and middle legs beyond their trochanters pale 

 fulvous, the femora more ot less yellow; hind coxa blackish, yellow at 

 apex and below; hind trochanters yellowish in front, brownish or 

 blackish behind; hind femur fulvous, infuscate apically, especially 

 above; hind tibia fulvous, infuscate on basal 0.2 and apically; hind 

 tarsus fulvous, its segments apically pale brown. 



Female: Upper margin of face, often lower lateral margin of frons 

 and lower margin of clypeus, palpi, and mandible subapically (espe- 

 cially on margins), dirty whitish; antenna dark brown, paler below, 

 its scape sometimes whitish below ; tegula whitish or sometimes brown 

 with a basal whitish spot; hind corner of pronotum usually fulvous; 

 subtegular ridge usually pale; legs fulvous or sometimes tinged with 

 brown, the hind tibia infuscate basally and apically. 



Females of this species from Canadian localities are often smaller, 

 darker, and with stouter legs and longer heads than normal. Speci- 

 mens showing these differences strongly are from Pinkham Notch, 

 N. H.; Whiteface Mt., at 1,000 to 2,000 ft., N. Y.; Keene Valley, 

 N. Y. ; and Phantom Valley in Rocky Mountain National Park at 

 9,400 ft., Colo. In these the head is 0.90 to 0.97 as long as deep, 

 while in more typical females the head is about 0.85 as long as deep. 

 Because of intergrading specimens we cannot consider the form with 

 the longer head specifically distinct. 



Specimens (106 d", 499): From Alaska (Mount McKinley at 2,500 

 ft.) ; Alberta (Banff, Beaverlodge, and Edmonton) ; Colorado (5 miles 

 west of Cameron Pass in Larima County, Pando, Phantom Valley in 

 Rocky Mountain National Park at 9,400 ft., and Rabbit Ears Pass at 

 9,500 ft.); Idaho ("Craig Mts." and Waha); Maine (South West 



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