No. 2312. NEW NORTH AMERICAN HYMENOFTERA—ROHWER. 213 



the habitus, characters of the head, and antennae are tjr^iical of the 

 genus Pteronidea. 



Female. — Length 5 mm. Robust; shining. Clypeus gently con- 

 vex, the anterior margin shallowly, arcuately emarginate, the lobes 

 broad and rounded apically; supraclypeal foveae deep, punctiform^ 

 not connected with the antennal foveae; supraclypeal area uniform^ 

 convex, not sharply defined dorsally but tapeziodal in outline; median 

 fovea shallow, circular in outline; frontal crest broken by an elongate 

 shallow depression which appears as an interrupted extension of the 

 middle fovea; ocellar basin short, sharply defined, shining, trape- 

 zoidal in outhne; antennal furrows well defined dorsally; postocellar 

 line subequal with the ocellocular line; postocellar area sharply defined 

 anteriorly by the distinct angulate postocellar furrow; a distuict fur- 

 row from the anterior ocellus to the postocellar furrow, posterior orbit?* 

 full, straight; antennae rather short, distinctly tapering, the third 

 joint a trifle shorter than the fourth; inner tooth of the claw shorter 

 than the outer; stigma long, narrow, sharply tapering, fully four 

 times as long as its greatest v/idth; reciu-rentella distinctly post- 

 f ureal; sheath broad, straight above, truncate apically, the trunca- 

 tion slightly emarginate, oblique to a broad base. Black; sides of 

 the nates ferruginous; legs black; trochanters, apices of the femora, 

 ail of the tibiae and tarsi, yellowish-ferruginous; wings hyaline, 

 venation dark brown, costa and stigma j^^ellow; head and thorax 

 with short white hair. 



Type locality. — St. George Island, Bering Sea. Described from 

 one female collected by G. Be Has Hanna, June 14, 1914, and re- 

 corded under his lot No. 12. 



Type.~Cat. No. 21644, U.S.N.M. 



PTERONroEA ALNIVOEA, new species. 



This species is closely allied to Pteronidea corylus (Cresson) but the' 

 scape and the supracl3^peal area are black, the middle fovea is broader 

 and more rounded, the lower margins of the lancets have small sharp 

 teeth. 



Female. — ^Length 6 mm.; length of the antennae 4.5 mm. Ante- 

 rior margin of the clypeus deeply arcuately emarginate, the lobes 

 obtusely rounded, distinctly narrower than the emargination; supra- 

 clypeal area uniformly convex, triangular in outline; supraclypeal 

 foveae deep, elongate, confluent with the antennal foveae; middle 

 foveae broad, U-shaped in outline, walls sloping; frontal crest very 

 prominent, broken; ocellar basin hexagonal in outline, open above 

 with the lateral and lower walls high but sloping; postocellar area 

 convex, parted, well defined laterally but only incompletely defined 

 anteriorly; antennae distinctly tapering, the third joint a trifle longer 

 than the fourth; head and thorax shining; stigma short, rounded 



