134 TRANS. ST. LOUIS ACAD. SCIENCE. 



glabrous tubercle on the disk of the face. 2. The palpi are generally dull 

 dark rufous in $, sometimes pale rufous, sometimes almost whitish, but 

 in d* they are always whitish. The antennae are about | as long as the 

 body, the ist joint of the flagellum in d" 3-3* times, in $ 4-5 times, as long 

 as wide, the entire flagellum c?$ tinged with rufous beneath. 3 The 

 thorax is finely and sparsely punctate both above and below, and the me- 

 tathorax is confluently and rather coarsely punctate, and usually more or 

 less covered with fine whitish pubescence so as to be opaque, the poste- 

 rior declivity and a small area behind the scutel glabrous and polished, 

 the two glabrous areas never quite confluent. Carinae all obsolete, except 

 a small basal portion of the two central ones. 4. The abdomen is conflu- 

 ently punctate and opaque ; the usual tubercles are subobsolete ; and the 

 sides and extreme tips of the intermediate joints are often more or less 

 tinged with sanguineous in $, sometimes conspicuously so, but never in 

 (5*. In joint I the usual carinae scarcely extend half waj' to the tip, and 

 enclose between them a glabrous, circular, subbasal excavation. 5. The 

 ovipositor is i as long as the body ; the sheaths pubescent, scarcely ta- 

 pered, and basally rather narrower than the last tarsal joint of the hind 

 legs. Venter dull rufous, blackish at tip, sometimes all blackish except 

 the extreme base". 6. The legs are pale bright rufous, but io the front legs 

 of more than i of the cfc? the trochanters are whitish, in the middle legs 

 C?? the second ^ of the tibia is whitish, and very rarely the first | and the 

 terminal J blackish exteriorly; and in the hind legs the cTS extreme tips 

 of the femora and the whole tibia except the second ^ are black, and the 

 tarsi are pale dusky, often with the base of each joint gradually a little 

 paler. 7. The areolet is mostly rhomboidal, verj' rarely subtruncate an- 

 teriorly, but never peduncled. The bullae A and B are confluent, and C 

 and D sometimes separated by a small space and sometimes quite conflu- 

 ent. Length (^.14-. 44 inch; ? .20-.47 inch. Front wing d'.ii-.33 inch; 

 $ .20-38 inch. Ovipos. .10-. 19 inch. 



' Twenty-six c? ; twenty-seven 9. I bred a single $ from a 

 small Lepidopterous pupa. The variation in size is enormous, but 

 all the intermediate grades occur, and the variations enumerated 

 in the description are not correlated with size. In P. conquisi- 

 tor^ Say, the size is almost as variable. Very near tenuicornis. 

 Cress., described from a single ^, but differs in the metathorax 

 not being " indistinctly sculptured," in the tegulae being always 

 white not "piceous," in the anterior coxae being never black, and 

 in the middle tibiae being always annulate with whitish and the 

 tips of the hind femora black. Brull6 describes only the $, and 

 says that " it is only behind that the middle tibiae are black" ; 

 whereas it is only on their exterior (or superior), not on their 

 ■posterior^ surface that they are ever black, and even then but 

 rarely so. Sanguineous tips to the intermediate abdominal joints 



