138 TRANS. ST. LOUIS ACAD. SCIENCE. 



Five (?, ten $ ; one <S bred June 7 from a small Lepidopterous 

 pupa beaten off forest-trees. The variation in the size of $ is 

 considerable, and evidently deceived Say into treating the sizes 

 as distinct species ; but all the intermediate grades occur, and a 

 still wider range is met with in the size of P. annuli'pes, Brull^. 

 {See above.) Say describes his 2 plurivinctus as having been 

 bred from the cocoon of a Bombyx, which is probably Clisio- 

 campa americana. According to Mr. Cresson (^Practical Ento- 

 mologist^ i. p. 19), conquisitor was bred fiom this same cocoon. 



To this group also appertains apparently P. tenuicornis^ 

 Cress. 



ttt Hind tibice black with a basal and a medial white 

 band. 



Pimpla {Ickneumon) inqoisitor, Say. — $. — Black. Head highly pol- 

 ished, very sparsely and almost microscopically punctate. Clypeus occa- 

 sionally piceous. Palpi white. Antennae ^-§ as long as the body, with 

 joint I of the flagellum 3-4 times as long as wide, brown-black, the flagel- 

 lum more or less tinged with rufous beneath. Thorax highly polished, 

 sparsely and almost microscopically punctate, the metathorax rather 

 closely and finely aciculate on the upper part of its pleura, and with its 

 two carinae distinct as far as the posterior declivity. Teguhe, and a con- 

 tiguous quadrangular spot in front of them, white ; the latter sometimes 

 rufescent, and the upper anterior angle of the quadrangle sometimes 

 slightly prolonged. Abdomen subpolished, finely and confluently punc- 

 tate except towards its tip and the tips of the joints, the normal tubercles 

 pretty distinct. Joint i scarcely narrower at tip than the base of 2, \ longer 

 than wide and i wider behind than before, the two carinae distinct nearly 

 to the tip and enclosing on their basal \ a highly polished excavation, the 

 polished surface continued between them | of the way to the tip. A shal- 

 low, transverse, lateral fovea on the suture between i and 2 occupying % 

 of its width. The very extreme tip of joints 5-7, and rarely that of 3 also, 

 pale sanguineous. Ovipositor piceous or black, i-| as long as the body; 

 sheaths black, rather densely hairy than pubescent, a little tapered, and 

 basally full as wide as the last tarsal joint of the hind leg. Venter whitish, 

 rarely pale fuscous. Legs pale rufous. Front legs with both trochanters 

 generally whitish, and the tibia- and tarsi whitish more or less tinged with 

 rufous. Middle legs with the 2d trochanter generally whitish, and the 

 tibise and tarsi whitish more or less tinged with rufous, the tibiae always 

 with their middle J faintly paler. Hind legs with the extreme tip of the 

 femora, except sometimes a very narrow white knee, obfuscated ; the tibiae 

 white, with their second J and terminal J-f black, and the tarsi dusky, 

 with the basal §-J of joints 1-3 and occasionally of 1-5 white. Wings 

 subhyaline, tinged with smoky yellow; veins black, radius rufous; stigma 

 black, basally pale rufous, sometimes with its disk also pale or dark rufous. 

 Areolet rhomboido-triangular, the 2d recurrent vein entering it § of the 



