396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



Female. — Length 8.5 mm. Clypeiis rather shallowly arcuately 

 emarginate anteriorly, basally transversely convex; antennal and 

 supraclypeal fovese confluent; middle fovea large, subquadrate, well 

 defined; lateral fovese sharply defined, confiuent with the large anten- 

 nal foveas below, above the level of the middle fovea; ©cellar basin 

 triangular in outhne, better defined above; frontal crest well defined; 

 antennal furrows complete to the crest from the occiput; postocellar 

 furrow curved anteriorly; postocellar line shorter than the ocelloc- 

 cipital or ocellocular; postocellar area subquadrate; antennre pilose, 

 short, tapering beyond middle, third joint longer than the fourth and 

 fifth; stigma tapering; transverse radius in apical fourth of cell; 

 transverse median much beyond the middle; lanceolate cell of the 

 hind wings sessile; liind basitarsis much shorter than the following. 

 Black; clypeus, labrum, apical joints of palpi, narrow posterior mar- 

 gin of pronotum, tegulse, four anterior femora beneath, apicies of 

 coxse, trochanters, bases of posterior femora, tibiae except apicies (the 

 band is incomplete on the four anterior ones) and anterior tarsi white. 

 Wings dusky hyaline, iridescent; venation black. 



Federal District of Mexico. One female from Guillermo Grandara 

 of Estacion Agricola Central. 



Type.—Csit. No. 14008, U.S.N.M. 



Genus STRONGYLOGASTER Dahlbom. 

 STRONGYLOGASTER TUBERCULICEPS, new species. 



Readily distinguished from Strongylogaster tacitus Norton by the 

 strongly parted postocellar area, shining ocellar and frontal areas 

 and the better defined ocellar basin. 



Female. — Length 7 mm. Clypeus angulately emarginate, lobes 

 broad, triangular, surface very coarsely sculptured; supraclypeal 

 fovese large, circular in outline; supraclypeal area subconvex, 

 smooth shining; antennal fovese large sharply defined, and subangu- 

 late above; antennal furrows complete from the fovese, deeper at the 

 postocellar area; middle fovea small, oval in outline; ocellar basin 

 shining, well defined laterally, triangular in outline; postocellar 

 furrow poorly defined; postocellar line shorter than either the 

 oceUoccipital or ocellocular; postocellar area strongly convex, parted 

 in the middle which makes it appear bituberculate; first and second 

 flagellar joints subequal; head shmmg, with irregularly scattered, 

 distinct punctures; mesonotum shining, practically impunctuate; 

 third cubital cell much longer than the second receiving the trans- 

 verse radius near apical third; transverse median somewhat beyond 

 the middle; sheath obtusely rounded apically. Black; anterior tibise 



