1864.] 279 



1 1 . Tryphon analis. n. sp. 



Black : face yellow : legs and abdomen, except apex, rufous ; wings hyaline, 

 areolet triangular, petiolated; abdomen sessile, flattened. 



Male. — Head black ; face beneath antenuee, clypeus, mandibles and 

 palpi, yellowish ; lateral margins of the clypeus and extreme tips itf 

 mandibles, black ; face somewhat elevated with a deep, subtriangiilar 

 incisure towards the base of the antennae ; antennse three-fourths as 

 l(»nu- as the body, brown above, the two basal joints black, beneath red- 

 dish-brown, the basal joints paler. Thorax smooth and polished ; tegulte 

 yellow ; metathorax shining, the elevated lines irregular and tolerably 

 well defined, the central ai-ea moderate and subquadrate. Wings hya- 

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

 small, triangular, petiolated; 2nd recurrent nervure angular in the 

 middle. Legs, with the coxje, pale rufous, the trochanters yellowish, 

 the tips of the posterior femora, tibise and tarsi somewhat obfuscated. 

 Abdomen sessile and flattened as in Bassus, the dorsal surface of the 

 three basal segments being somewhat uneven, the first segment with 

 two carinae near its base ; the four basal segments pale rufous, the 

 apical margin of the foiarth and the remaining segments black, polished. 

 Length 3] lines; expanse of wings 6 lines. 



Hah. — Pennsylvania. E. T. Cresson. 



This species has much the form of those of the genus Bassus. 



12. Tryphon festivus, n. sp. 



Black ; mouth, antennse and four anterior legs, yellowish ; posterior legs and 

 abdomen except base, rufous : wings long, hyaline, areolet oblique, petiolated ; 

 abdomen subsessile, subclavate. 



3Iale. — Black, shining, clothed with a short, thin, whitish pubes- 

 cence, which is most obvious and silvery on the fece ; clypeus, man- 

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

 above, yellowish beneath, the basal joint yellow beneath ; tegulae pale 

 yellow; metathorax punctured, the elevated lines obsolete. Wings 

 long, hyaline, iridescent ; nervures and stigma blackish, pale at base ; 

 areolet small. obli({ue and petiolated ; 2nd recurrent nervure with a 

 rudimental nervure on its exterior middle. Legs : the two anterior 

 pairs yellowish, slightly tinged with rufous ; the posterior pair dull ru- 

 fous, somewhat obfuscated; their coxas black, with the tips beneath 

 and the trochanters, yellowish. Abdomen subsessile, or slightly sub- 

 petiolated, subclavate; basal segment carinated on its disk, with slight 



