ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 



261 



•\ / / I — 1 



Figures 158, 159. — Localities: 158 (left), Exochus ventricosus; 159 (right), E. silus. 



Black. Face, lower 0.45 ± of frontal orbit, large triangular spot at 

 top of eye, cheek, clypeus, mouth parts, front of scape, large hind 

 corner of pronotum, tegula, and subtegular ridge, white; flagellum dark 

 brown beneath; postscutellum and apex of scutellum with a narrow, 

 obscure pale line; mesopleurum and metapleurum sometimes mostly 

 fulvous; front and middle legs white, their coxae basally, basal 0.7 ± 

 of femora, and apical 0.4 ± of tibiae pale fulvous; hind coxa, tro- 

 chanters, and femur fulvous, the femur white apically above; hind 

 tibia white, its apical 0.28 ± fuscous; hind tarsus white, the apical 

 half of its fifth segment fuscous. 



Type: 9, Westerly, R. I., July 10, 1936, M. Chapman (Washington, 

 USNM 63679). 



Paratype: 9, Farmingdale, N. Y., July 10, 1938, H. and M. Townes 

 (Townes) . 



53. Exochus silus, new species 



Figures 190,t; 196,g 



Front wing 4.0 to 5.0 mm. long ; combined face and clypeus about 0.92 

 as high as wide in male, about 0.80 as high as wide in female, in the 

 male strongly convex below middle and weakly convex above middle, 

 in female very strongly convex below middle and flat at and above 

 middle; median area of frons very strongly and sharply elevated and 

 differentiated ; apical angle of interantennal process about 60 degrees ; 

 median half of clypeal margin approximately straight; mandible 

 of moderate size, not or faintly twisted, moderately tapered from its 

 base to the base of its teeth, its outer face with a few punctures; second 

 lateral area of propodeum with a few hairs at extreme base and in 

 lateroapical corner; punctures on second tergite small and sharp, 

 absent medially, the sublateral punctures separated by about 1.4 

 their diameter. 



