ICHNEUMON-FLIES OF AMERICA: 1. METOPIENAE 143 



abdomen approximately parallel-sided; first tergite broad at base, 

 in profile strongly convex above, its spiracle near its basal 0.25, its 

 lateral and median pair of longitudinal carinae strong and sharp to 

 the apex; second tergite with a pair of median longitudinal carinae 

 basally; epipleurum of first tergite vestigial, of second tergite very 

 narrow, of third tergite narrowly wedge-shaped, of fourth tergite 

 moderately wide, of fifth and following tergites not separated from 

 the tergite; seventh tergite not strongly retracted in either sex; female 

 subgenital plate an unspecialized sclerite of moderate size. 



Genotype: Tylecomnus minoris Davis. 



The generic name is from the Greek "bothros" (cavit}0 plus "omos" 

 (shoulder), in reference to the cavity in the subtegular ridge. 



Key to the Species of Bothromus 



1. Area of first tergite between lateral longitudinal carina and ventral edge of 

 tergite tapered beyond spiracle, subapically about 0.7 as wide as middle 



tibia; apical 0.2 or less of hind femur fuscous 1. minoris (Davis) 



Area of first tergite between lateral longitudinal carina and ventral edge of 

 tergite uniform in width beyond spiracle, subapically about 1.1 as wide as 

 middle tibia; apical 0.25 to 0.8 of hind femur fuscous . 2. gibbus, new species 



1. Bothromus minoris (Davis), new combination 



Figure 176,b 



Front wing 4.0 to 6.2 mm. long; first tergite in profile moderately 

 convex, about 2.6 as long as high, the area between its lateral longi- 

 tudinal carina and ventral edge tapered beyond spiracle, subapically 

 about 0.7 as wide as the width of middle tibia; second tergite moder- 

 ately convex, with close, moderate-sized punctures, its median pair 

 of carinae extending 0.3 to 0.7 its length in male, extending 0.2 to 

 0.35 its length in female; seventh tergite rather strongly retracted. 



There are two subspecies, separable on color as indicated below: 



1. Hind femur fulvous, its apical 0.15 to 0.2 fuscous; hind tibia whitish sub- 

 medially, fuscous at base and apex; tegula whitish; range: transcontinental 



in Canadian and Transition zones la. minoris minoris (Davis) 



Hind femur entirely fulvous, hind tibia ferruginous, infuscate at apex and 

 apically above; tegula dark brown; range: California. 



lb. minoris cruralis, new subspecies 



la. Bothromus minoris minoris (Davis), new combination 



Tylecomnvs (!) minoris Davis, 1897, Trans. Amer. Ent. Soc, vol. 24, p. 204; 9 . 

 Type: ? , New Hampshire (Philadelphia). 



Black. Palpi of male, under side of scape of male, tegula, subteg- 

 ular ridge, and spurs of middle and hind tibiae whitish; flagellum 

 blackish brown, paler beneath (especially in male); palpi of female, 

 front and middle legs, and hind coxa, trochanters, and femur fulvous, 

 the apical 0.15 to 0.2 of hind femur fuscous and the male front and 



