88 TRANS. ST. LOUIS ACAD. SCIENCE. 



tubercle placed J of the way to its tip, and very large and prominent; the 

 2 usual carinse reaching § of the way to its tip. Joint 2 with a round 

 fovea in its anterior angle. Joints 2 and 3, with a subobsolete transverse, 

 medial stria widely interrupted on the dorsum. Joint i with a narrow, 

 terminal white line ; 2-6 with a white fascia on their terminal \, very nar- 

 rowly interrupted above on 2, but more and more widely so in each suc- 

 cessive joint, till in 6 it is reduced to a mere lateral white dot. Venter 

 yellowish-white. Four front le^s very pale rufous, hind legs pale rufous; 

 all the coxae and trochanters white ; tips of the 4 front tarsi, and the whole 

 of the hind tarsi fuscous. Wings hyaline; veins black, radius whitish; 

 stigma black, whitish at base, twice as long as wide. BulUe indistinct, 

 the wings being in bad order. Length ^ .19 inch. Front wing ^ . id- 

 inch. 



One % ; $ unknown to me. Very near maculifrons^ Cress. 

 (2 only described), and may possibly be the other sex of that spe- 

 cies. Differs by its white face and orbits, and by the legs being 

 more marked with white, which are common sexual characters- 

 in % Ichneumonidce ; and also in the pale markings of the sternum 

 and abdomen, which may possibly be also sexual characters. The 

 clypeus, however, is not " profoundly impressed on each side,**" 

 unless by this phrase is meant the usual foveae, which are located, 

 as in all Ichneumonidce^ in the clypeal suture ; neither is its "ba- 

 sal margin prominent," nor is the metathorax "without elevated 

 lines." 



BasSUS bicapillaris, n. sp. — ,^. — Black. Head with the clypeus piceo- 

 rufous and truncate at tip, its anterior edge reflexed and in the middle 

 slightly depressed and emarginate. Mandibles and palpi white. Antennae 

 \ as long as the body. Thorax very finely and regularly punctate so as ta 

 appear subglabrous and polished. Tegulse, a short line beneath the front 

 wing, a roundish spot before it, and a subclavate line adjoining the hu- 

 meral suture above, all three of them nearly contiguous, white. Scutel 

 rufous. A capillary white line extending in a semicircle from the front of 

 the base of one hind wing behind the scutel to the front of the base of the 

 other one, and a similar line parallel with the first and extending from 

 the back of the base of one hind wing to the back of the base of the other 

 one. Abdomen with joints 1-3 rugoso-punctate, each gradually less so,^ 

 the remaining joints gradually almost glabrous and polished. No trans- 

 verse striae. Joint I with a wide, flattish, subglabrous, longitudinal carina, 

 bifurcating in front, and a narrow, acute, sublateral one terminating in a 

 small, glabrous tubercle at each hind angle. Joint 2 with similar carins^ 

 fading away at the middle. Venter blackish. Legs pale rufous. Hind 

 trochanters white. Terminal \ of hind femora, and whole of hind tarsi, 

 black. Hind tibiae black, with their basal \ white. Wings hyaline; vein* 

 black, paler on the postcosta ; the radius whitish ; stigma black, 3 times aa 



