1865.] 15 



Male. — Head yellow, a spot behind antennae and a broad transverse 

 band on the occiput, brown; eyes black; antennae three-fourths the 

 length of the body, brown, paler beneath, basal joint beneath yellow. 

 Thorax yellow, shining; mesothorax brown, with two longitudinal, 

 dorsal, yellow lines, slightly converging on the scutellum ; an elongate 

 spot on each side of the pectus towards the mesothorax, a disconnected 

 line and a spot on the pectus under the wings, blackish; scutellum and 

 postscutelluni, as well as the posterior margin of the mesothorax, yel- 

 low, the space on each side brown ; metathorax finely rugose, yellow, 

 with the base, a broad stripe down the middle, a large spot on each 

 side at base and the lateral sutures, black, the elevated lines not well 

 defined, the central area moderate, subovate. Wings pale yellowish- 

 hyaline ; uervures fuscous, stigma ferruginous ; areolet 5-angular. 

 Legs yellow, the posterior pair tinged with fulvous, their tibiae and tarsi 

 slightly obfuscated. Abdomen elongate, depressed; first segment with 

 a long, slender peduncle, the tip suddenly and squarely dilated, with 

 two elevated ridges on the disk ; basal foveae of the second segment 

 oblique and well impressed ; basal segment black, extreme tip yellow ; 

 second segment black, the apical third yellow ; third segment yellow, 

 the basal third black ; remaining segments brown, tinged with ferrugi- 

 nous. Length 7 lines ; expanse of wings 12 lines. 



Collection. — Ent. Soc. Philad. One specimen. 



Genus MESOLEPTUS, Grav. 

 Mesoleptus insularis, n. sp. 



Black ; spot on mandibles, palpi, tegulse, legs, and middle of abdomen ob- 

 scurely, yellowish or testaceous ; wings hyaline, iridescent. 



% 9 . — Black, opaque, slightly pubescent, more obvious on the face; 

 spot on each mandible, and the palpi, yellowish ; antennae nearly as 

 long as the body, rufo-piceous; tegulae yellow; metathorax finely sculp- 

 tured, slightly rugose, the elevated lines ill-defined. Wings hyaline, 

 iridescent; nervures and stigma pale fuscous; areolet minute, oblique 

 and petiolated. Legs testaceous, the coxae black, the trochanters pale 

 yellowish, the posterior tibia; and tarsi dusky, the former with an indis- 

 tinct pale annulus. Abdomen elongate, very slender at base, gradually 

 broader and subcom pressed towards the tip, black, tinged with fuscous; 

 sides of 2nd, 3rd and sometimes the 4th segments obscurely testaceous; 

 ovipositor of 9 exserted about half a line. Length li line; expanse 

 of wings 2 2 lines. 



Collection. — Ent. Soc. Philad. 2 ( % $ ) specimens. 



