ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 15 



9. Yellow on side of frons extending dorsally to a little above center of eye emar- 

 gination (fig. 178,g) ; face about 0.9 to 1.1 as high (measured from center of 

 clypeal fovea to lower edge of antennal socket) as the mouth is wide (meas- 

 ured between bases of mandibles) ; front wing 3.0 to 3.8 mm. long. 



6. constrictus Davis 



Yellow on side of frons absent, or not extending dorsally beyond center of eye 



emargination (figs. 178,h,i); face about 0.75 to 1.0 as high as the mouth is 



wide; front wing 2.9 to 5.4 mm. long 7. funebris (Gravenhorst) 



1. Chorinaeus longicalcar Thomson 



Front wing 4.5 to 7.0 mm. long; face about 1.0 as high as mouth is 

 wide in male, about 0.9 as wide in female; median 0.6 of apical margin 

 of clypeus approximately straight; mandible about 1.90 as long as 

 wide in male, about 2.3 as long as wide in female, its upper tooth 

 enlarged (especially in female) and outer face coarsely punctate; 

 flagellum with about 39 segments in male, with about 32 segments in 

 female; punctures on mesopleurum fine, weak, and rather dense; 

 amount of hair on metapleurum varies according to the subspecies; 

 front spur of middle tibia about 0.77 as long as hind spur; second seg- 

 ment of middle tarsus about 2.1 as long as wide in male, about 1.5 as 

 long as wide in female; second tergite without a longitudinal carina 

 just mesad of its spiracle; punctures of second tergite smaller and 

 more evenly dense than in other Nearctic species, not forming well 

 marked longitudinal rugulosities ; apex of penis without setae and more 

 bulbous than in other Nearctic species. 



Coloration variable, according to the subspecies (which see). 



This is the largest Nearctic species of Chorinaeus, and the one with 

 the most slender build and finest sculpture. The extensive puncta- 

 tion of the pronotum, propodeal spiracle usually near the lateral carina, 

 and narrow angle between the lateral carinae of the first tergite, as 

 these characters are described in the key, are unique among the 

 Nearctic species. 



This is a Holarctic species, with five subspecies as defined below. 

 It is the earliest species of the season, adults appearing in early spring 

 and disappearing in early summer. 



Key to the subspecies of Chorinaeus longicalcar 



1. Hind femur fulvous and/or yellow, rarely its front and back blackish .... 2 

 Hind femur black, more or less yellow at the base and apex 3 



2. Hind tibia of male fulvous, with a dorsal yellowish tinge on its basal 0.2 ± ; yel- 



low orbital line of female very narrow; range: Europe. 



la. longicalcar longicalcar Thomson 



Hind tibia of male fulvous to yellow, always with its basal 0.25 yellow, and 



usually fulvous with its basal 0.3 and a dorsal stripe yellow; yellow orbital 



line of female rather wide (figs. 178,a,b) ; range: Mostly Alleghenian fauna. 



lb. longicalcar pleturus Davis 



