J77 



1864.] '277 



gin of the ciypeus a blackish, well impressed puncture ; antennae two- 

 thirds the length of the body, porrect, blackish, the base and apex yel- 

 lowish, the basal joint beneath yellow. Thorax black, shining; tegulae 

 pale yellowish ; metuthorax shining, with four sharply defined longitu- 

 dinal carinas, the two middle ones approximate. Wings hyaline ; ner- 

 vuresand stigma fuscous, pale at base; areolet small, triangular, slightly 

 petiolated, the second recurrent nervure angular in the middle. Legs : 

 the two anterior pairs, the posterior coxae and trochanters, and the basal 

 half of their tibiae, and most of their tarsi beneath, yelfbw ; the poste- 

 rior femora rufous, their extreme tips, the apical half of their tibias and 

 most of their tarsi above, black. Abdomen elongate, subsessile, rufous; 

 basal segment except its apex, black, flattened, with two elevated lines, 

 very slightly dilated at the apex ; apical segment faintly tinged with 

 yellowish. Length 5 lines ; expanse of wings 8 lines. 



^«6.— Delaware (Dr. Thos. B. Wilson) ; Canada West (Mr. B. Bil- 

 lings, Jr.) 



8. Tryphon aflSnis, n. sp. 



Black ; mouth, legs and abdomen, rufous ; wings hyaline, areolet subtrian- 

 gular, petiolated ; abdomen subsessile, subclavate. 



Female. — Head black ; ciypeus, mandibles and palpi, dull yelloAvish; 

 antennte two-thirds the length of the body, blackish, yellowish at base 

 and at tips. Thorax shining, black ; tegulae pale yellow ; scutellum 

 and metathorax black, the latter polished, with four very sharply de- 

 fined longitudinal carinae as in the preceding species. Wings obscure 

 hyaline, faintly tinged with fuliginous at tips ; nervures and stigma 

 blackish, whitish at base; areolet minute, subtriangular, slightly oblique, 

 petiolated; 2nd recurrent nervure angular in the middle. Legs pale 

 rufous, the two anterior pairs and the posterior trochanters tinged with 

 yellowish ; posterior femora at tips, their tibiae, except a broad, pale, 

 ill-defined annulus near the base, and most of their tarsi, blackish. 

 Abdomen subsessile, subclavate, shining, rufous, the first segment ex- 

 cept tip, black, with two approximate, well-defined longitudinal carinas 

 on the middle towards the base ; apical segments very slightly com- 

 pressed. Length 4 lines ; expanse of wings 6 lines. 



Hab. — Pennsylvania and New Jersey. E. T. Cresson. 



Closely allied to T. americanus, but is smaller, with the face entirely 

 black. 



