1864.] 273 



Section 1. 



1. Tryphon pedalis, n. sp. 



Black, shining; legs pale fulvous, posterior tibipe and tarsi black, annulated 

 with white ; wings hyaline, iridescent, areolet small, oblique, subpetiolated ; 

 abdomen sessile. 



3fale. — Black, shining, slightly pubescent; most of the mandibles 

 and the palpi, whitish ; antennas as long as the body, piceous, the basal 

 joint black. Thorax polished, the dorsal lines well impressed, deeply 

 so in front; teguhie whitish; metathorax with the elevated lines toler- 

 ably well defined, the central area modei-ate, subquadrate. Wings hya- 

 line, iridescent ; nervures and stigma blackish, pale at base ; areolet 

 small, oblique, subpetiolated. Legs pale fulvous, the posterior tibire 

 black, with a broad white annulus in the middle ; their tarsi also black, 

 annulated with white. Abdomen black, shining, sessile ; basal segment 

 with two sharply defined longitudinal carina? on the disk ; apical seg- 

 ment somewhat pointed. Length 2f lines; expanse of wings 5 lines. 



ITaJ>. — Illinois. Dr. Samuel Lewis. 



2. Tryphon earinatus, n. sp. 



Black; face and legs yellow or yellowish-red; wings obscure hyaline, areolet 

 wanting; legs short and thick, abdomen sessile, subclavate, basal segments 

 carinated. 



Male. — Black, rather shining, thickly clothed with pale pubescence ; 

 face, except a short elongate blackish mark just beneath the antennae, 

 clypeus, except a blackish spot on each lateral margin, tips of the man- 

 dibles and the palpi, yellowish ; antennae about as long as the body, 

 black ; tegulae obscurely yellowish ; scutellum flat, rather large, its sides 

 carinated ; met:ithorax with the elevated lines longitudinal and sharply 

 defined, the central area narrow and extending the whole length of the 

 metathorax. Wings obscure hyaline, iridescent ; nervures and stigma 

 black, the former pale at base ; areolet wanting. Legs short and thick 

 as in Exodms ; pale rufous, the two anterior pairs more or less tinged 

 with yellowish, the posterior coxae mostly black, and their tarsi brown- 

 ish. Abdomen sessile, subclavate ; basal segment with four sharply 

 defined longitudinal carinae; the second segment longitudinally rugose, 

 with a well defined carina down its middle; the three following seg- 

 ments rather densely and deeply punctured and clothed with pale, ap- 

 pressed pubescence, the punctures on the apical segments fine and indis- 

 tinct. Length 3 lines; expanse of wings 4^ lines. 



