ICHNEUMON-FLIES, PART 2\ EPHIALTINAE 



11 



longitudinal carinae extending about half its length; basal grooves 

 on second tergite weak, almost transverse; third and fourth tergites 

 with weak but definite tubercles, their apical impunctate margin 

 occupying about 0.2 their length; female subgenital plate with a 

 large median basal membranous area; ovipositor sheath about 1.4 

 as long as front wing; ovipositor straight, cylindric, its apex as in 

 figure 329, c. 



According to our definition, this genus includes a single Nearctic 

 species, as treated below, and the European Ichneumon roborator 

 Fabricius 1793, Ephialtes longiseta Ratzeburg 1844, and Ephialtes 

 arundinis Kriechbaumer 1887. The latter two species have not 

 previously been referred to Exeristes. 



1. Exeristes comstockii (Cresson), new combination 



Figures 320,a; 329,c 



Ephialtes comstockii Cresson, 1880, Ann. Rep. U. S. Dep. Agr. for 1879, p. 235, 9 . 



Lectotype: 9 , Ithaca, N. Y. (Washington). 

 Biology: Cushman, 1927, Journ. Agr. Res., vol. 34, p. 616. — Miller, 1953, 



Ohio Journ. Sci., vol. 53, p. 60. 



Front wing of male 5.5 to 6.8 mm. long, of female 6.0 to 11.5 mm 

 long; face with moderately coarse punctures that are separated by 

 about 1.3 their diameter; temple moderately to strongly convex; 

 punctures on mesopleurum and metapleurum moderately coarse to 

 moderately fine, separated by about 1.2 to 3.0 their diameter; median 

 carinae on propodeum extending about 0.55 the length of propodeum; 

 tarsal claws of female each with a large basal lobe; nervellus broken 

 near its upper 0.40; second tergite with coarse punctures; apical 

 tergites of male progressively smoother and with finer punctures; 

 ovipositor sheath about 1.45 as long as front wing. Specimens from 

 the western half of North America have the face more coarsely 



Figure 1. — Localities for 

 Exeristes comstockii. 



