NO. 2340. TRIBE EPHIALTINI OF THE ICHNEUMONINAE—CUSHMAN. 349 



Male. — Differs from female in above characters as follows: Malar 

 space hardly a third as long as basal width of mandible; antennae 

 somewhat shorter and more strongly attenuate basally, lower mar- 

 gins of foramina at middle of eye; front more shallow and more 

 strongly punctured; temples more strongly rounded, less sharply 

 sloping. 



Variation.— Female.— 5.5-15 mm. Head from above slightly 

 more to slightly less than half as long as wide, temples from strongly 

 rounded to nearly flat; front barely concave to rather strongly con- 

 cave, the concavity extending up to the vertex and down at each side 

 below the antennae; face from sparsely punctate and polished to 

 densely rugosely punctate and subopaque; antennal foramina from 

 middle to distinctly above middle of eye; mesoscutum from slightly 

 longer than wide with no indication of notauli to much longer than 

 wide with notauli weakly indicated to near middle; propodeum from 

 strongly rounded to rather flattened above, the spiracle round to 

 broad oval; first tergite from distinctly longer than wide with spira- 

 cles prominent to as wide as long with spiracles not prominent; legs 

 pale to bright testaceous; tegulae, humeral spot, wing base, and 

 annuli of hind legs pure white to yellowish white; wings hyaline to 

 yellowish. 



Male. — About as given for female except that sculpture of face 

 varies but little. Perhaps the most remarkable variation is in the 

 form of the abdomen in this sex. In the small specimens it is but 

 little more than twice as long as the thorax, elongate fusiform, and 

 densely, rather opaquely punctured, while in the large ones it is fully 

 three times as long as the thorax, linear, sparsely punctate, and 

 highly polished. In the small form the wings reach nearly to the apex 

 of the abdomen and in the large form barely two-thirds of the way. 

 The above characters vary -wdth considerable constancy with size. 

 Other variations not so closely correlated with size are: Ovipositor 

 much less than one-third to distinctly more than one-third as long 

 as the abdomen; front and middle tibiae entirely without or with 

 considerable black externally; apices of tergites from nearly pure 

 white to pale reddish yellow; hind tarsal joints from mostly white to 

 less than half white; scape beneath in male from entirely white to 

 entirely black. 



Distribution.— From the States and Provinces represented in the 

 National Museum collection the range of this species is practically the 

 entire area east of the Rocky Mountains and from Quebec south to 

 Georgia and Texas, and there is also a series of a dozen specimens 

 from Bermuda. 



Hosts. — The host range is as wide as the geographic, including 

 both macrolepidoptera and microlepidoptera, with an occasional case 

 of secondary parasitism and of parasitism on an insect of some other 

 order. The following hosts are represented in the United States 



