No. 2326. THREE TRIBES OF ICHNEUMONINAE—CUSHMAN. 41 



more or less angulate and sometimes even with a short ramulus, and 

 the ovipositor more than half as long as the abdomen. In aialantae 

 the antennae are concolorous above and below, the discocubital 

 vein not at all angulate, and the ovipositor less than half as long as 

 the abdomen. 



Face rounded but not distinctly tuberculate medially, weakly, 

 sparsely punctate; eyes distinctly, though broadly, emarginate 

 opposite antennae; postocellar line and diameter of lateral ocellus 

 subequal; epomia weak; sternauli obsoletely impressed; lateral 

 carinae of propodaum weak basally, the costella not at all developed, 

 the spiracle more than half as long as height of pleural area, its lower 

 end very close to pleural carina, median carinae parallel; discocu- 

 bital vein sinuate with a more or less distinct angulation in the mid- 

 dle, not strongly curved; hind femur with a distinct scrobe for the 

 reception of the tibia, the scrobe flanked on the outside by a sharp 

 ridge which is either scalloped or entire ; fii'st tergite in profile uni- 

 formly weakly arched above, but little longer than second. 



Head mostly yellow, antennae reddish-brown, paler below, scape 

 and pedicel yellow; thorax bright refescent varied with yellow below 

 and on scutellum, thi-ee longitudinal stripes on mesoscutum darker, 

 sometimes more or less brownish, prepectus with a more or less dis- 

 tinct brownish spot on each side, metasterum and thoracic sutures 

 also sometimes brownish; abdomen darker rufescent, sometimes 

 more or less piceous; wings more or less yellow; legs stramineous to 

 pale testaceous, the lighter color on the front and middle coxae 

 and trochanters and base of hind tibia, hind femm* at base and apex 

 more or less piceous, apical joint of hind tarsus concolorous with 

 other joints. 



This is a very widely distributed species and subject to great 

 variation, especially hi size and color of wings, and Viereck has de- 

 scribed a variety, mellipennis, said to have the face medially finely 

 rugulose and the wings strongly yellowish. The sculpture of the 

 face varies somewhat in the series examined, and several specimens, 

 including one from the same locality as Viereck's type, have very 

 faint, fine rugulosity in the middle; but in the opinion of the WTiter 

 neither this nor the depth of color of the wings is of even varietal 

 significance. However, since Viereck's t3rpe has not been examined 

 the variety mellipennis is treated as valid and separable from the 

 typical form by the sculpture of the face as follows : 



KET TO VARIETIES. 



Face not or very faintly regulose medially fulvescens (Creseon). 



Face medially rugulose mellipennis Viereck. 



