ICHNEUMON-FLIES, PART 2\ EPHIALTINAE 



357 



Figures 160, 161. — Localities: 160 (left), Theronia atalantae fulvescens; 161 



(right), T. hilaris. 



This subspecies is transcontinental in the Canadian and Transition 

 zones. Its habitat is various kinds of mesophytic or damp woods. 

 Adults occur throughout the growing season. Hibernation appears 

 to be as adult females. Various larger or medium-sized Lepidoptera 

 in forests serve as hosts, particularly those pupating on tree trunks. 

 Sometimes it parasitizes other ichneumonids attacking these same 

 Lepidoptera. 



2. Theronia hilaris (Say) 

 Figure 314,b 



Ichneumon hilaris Say, 1829, Contrib. Maclurian Lyceum Arts Sci., vol. 1, p. 71 



(Leconte ed., vol. 1, p. 376); d". Type: d\ Indiana (destroyed). 

 Pimpla melanocephala BrullS, 1846, in Lepeletier, Histoire naturelle des insectes, 



hym6nopteres, vol. 4, p. 99; 9 • Name preoccupied. Type: 9 , North 



America (Paris). 

 Biology: Townes, 1939, Bull. Brooklyn Ent. Soc, vol. 34, p. 39; 1940, Ann. Ent. 



Soc. America, vol. 33, p. 291. 



Front wing 5.5 to 11.5 mm. long; apical edge of clypeus concave; 

 prepectal carina near its upper end curving sharply forward toward 

 and nearly reaching front margin of mesopleurum; lateral carina of 

 scutellum high at extreme base, thence abruptly obsolete; meta- 

 pleurum separated from propodeum by a complete carina ; median and 

 lateral longitudinal carinae complete basad of apical transverse 

 carina; costula faint or absent; all the other propodeal carinae sharp 

 and moderately strong; space between median longitudinal carinae 

 about 2.0 as long as wide, separated from petiolar area by a distinct 

 carina; petiolar area regularly hexagonal; first tergite about 1.6 as 

 long as wide, in profile the tergite abruptly curved at its midlength, 

 its median carinae extending about 0.8 its length; ovipositor sheath 

 about 1.4 as long as hind femur. 



