38 PROCEEDINGS OF. THE NATIONAL MUSEUM. vol. 58. 



and ocell-ociilar line equal; temples convexly sloping; antennae 

 stout, tapering slightly toward apex; thorax suhpolished, weakly 

 punctate; notauli deep, complete, prescutum rather low; meta- 

 pleura and propodeum more coarsely and densely punctate, the 

 latter polished medially; stigma narrow, radius in middle; nervulus 

 postfurcal; nervellus perpendicular, strongly broken in middle; first 

 tergite as broad at apex as long, with anterior basin broad and set 

 off by rather strong carinae, with ' deep oblique 'apical impressions ; 

 following tergites rather densely, finely punctured, elevations trans- 

 verse, apical tergites subpolished; exserted portion of ovipositor 

 rather longer than first tergite. 



Black; palpi white; clypeus, mandibles, and scape below piceous; 

 antennae brown; tegulae yellow; wings faintly brownish; legs mostly 

 testaceous, coxae piceous, those of front and middle legs reddish 

 toward apex; hind tibiae and tarsi fuscous with sub basal annuhis on 

 tibia and basal anmdus on basitarsus yellowish; apices of front and 

 middle femora, bases of their tibiae, and all trochanters more or less 

 yellow. 



Type locality. — Montana. 



Type.—Cat. No. 19172, U.S.N.M. 



One female without other data. 



Tribe THERONIINI Cushman and Eohwer. 



The genera included in this tribe are Therorda Holmgren, Neothe- 

 ronia Krieger, and Einmecoideus Ashmead. The first two have here- 

 tofore been placed in the (Pimphni) Ichneumonini, while Aslmiead's 

 genus was described in the Lissonotini. Pseudacoenites Kriech- 

 baumer, synonymous with Theronia, was considered by its author 

 to be related to Acoenites Gravenhorst, but was placed by Ashmead 

 in the Lissonotini. 



The closest relative of the Theroniini among tlie tribes is probably 

 the E])hialtini, and from that tribe it is easily distinguished by the 

 form of the ovi])ositor, the slit-like propodeal spiracles with their 

 prominent surrounding carinae, the short, deep, parallel notauli, and 

 the polish.ed, usually light-colored body. 



So far as definite information in regard to the host-relations of these 

 insects is at hand, they are apparently secondary parasites through 

 other Ichneumonidae, records of their having been reared from other 

 Ichneumoninae and Ophioninae having been published. 



Description. — Entire body almost unsculptured, smooth and pol- 

 ished; head transverse, narrow behind eyes, temples more or less 

 convex; face broader than long, narrowed toward clypeus; eyes large, 

 more or less distinctly emarginate or sinuate opposite antennae; 

 ocelli large; frons slightly concave; malar space very short; clypeus 

 truncate or rounded at apex; antennae long filiform, scape short. and 



