1864.] 257 



Descriptions of North American HYMENOPTERA. in the Collection of the 

 Entomological Society of Philadelphia. 



BY E. T. CRESSON. 



{Continued from page 196.) 



ICHNEUMONID^E. 



Genus MESOLEPTUS. Grav. 

 Section 1. — Scutellura and abdomen black, margins of the segments 



sometimes pale Sp. 1 — 7 



" 2. — Scutellum black, abdomen red or red and black Sp. 8 — 25 



" 3. — Scutellum pale or red, abdomen red, or red and black, or 



yellowish Sp. 2(i — SO 



Section 1. 



1. Mesoleptus major, n. sp. 



Opaque-black; legs dull rufous; wings hyaline, areolet small, subtriangular 

 and petiolated. 



Male. — Opaque-black, clothed with a thin, very fine, short, whitish 

 pubescence, especially obvious on the face ; mandibles entirely black ; 

 palpi pale; antennce rather more than half the length of the body, 

 entirely black ; tegulse also black ; metathorax finely scabrous, somewhat 

 longitudinally sulcate behind and with a transverse, rather ill-defined ca- 

 rina at base. Wings hyaline, slightly iridescent, nervures and stigma 

 black, the former pale at base; areolet minute, subtriangular, petiolated. 

 Legs dull rufous, all the coxae and trochanters black. Abdomen elon- 

 gate, slender, subfusiform; the first segment slender at base, swollen 

 and convex at tip, shining; apical segments broad and subcompressed. 

 Length 4^ lines; expanse of wings 62 lines. 



Ilah. — Delaware. Dr. Thos. B. Wilson. 



This species makes an oval cocoon, 4 lines long and 2 broad, of a 

 dirty white color with a broad black transverse band near each end. 



2. Mesoleptus annulipes, n. sp. 



Black ; spot on mandibles, palpi, tegulse, -4 anterior coxae, all the trochanters 

 and annulus on posterior tibiee, whitish ; wings hyaline, areolet minute, ob- 

 lique, petiolated. 



Female. — Black, clothed with a thin, fine whitish pubescence, more 

 obvious on the face ; spot on each mandible and the palpi, whitish ; 

 antennae nearly as long as the body, entirely black ; tegulae whitish ; 

 metathorax with the elevated lines well defined, the central area large 



