400 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 83 



third joint (ring joint) of antennae wider than long, second joint 

 (pedicel) usually a Httle longer than wide; front and face, except 

 hyperclypeal area, rather densely pubescent wdth stout whitish hair. 



Thorax: Area along inner margin of parapsides smooth, sometimes 

 finely aciculate or reticulate; um.biUcate punctures on mesoscutum 

 and scutellum round or roundish, the interspaces on mesoscutum 

 and middle of scutellum more or less conspicuously broad and usually 

 in large part smooth, the scutellum laterally with dense granular 

 sculpture; pronotum laterally usually distinctly longer than prepectus 

 measured on a line bisecting the angle of latter at tegula of wing; 

 axilla with a triangular or roughly triangular extension as wide as or 

 wider than long on side of scutellum, its base extending to or above 

 middle of axilla, surface of axilla sloping toward base of extension 

 and not depressed or excavated above base of extension; basal shallow 

 furrows on underside of apex of scutellum not turning caudad medi- 

 ally but meeting on the median line to form a single gently curved 

 furrow, rarely forming a slight angle medially; wing hairs rather short. 



Abdomen: Posterior face wider than long to longer than wide (the 

 latter condition usually better marked in the males); area on each 

 side of middle sparsely covered with long hairs; first tergite stj-ongly 

 transverse, usually smooth or w^eakly sculptured, the anterior margin 

 strongly elevated and convex, completely masking posterior aspect of 

 neck of propodeum, sometimes resting on latter and appearing to 

 form a petiolelike tergite. 



Color: Head green to cupreous, usually with more or less of front 

 and face dark olive green or blackish; thorax green or greenish, the 

 notiun usually more or less cupreous (in males sometimes entirely so), 

 propodeum and pleural regions in large part black; abdomen black, 

 usually with more or less of a greenish or cupreous cast; flagellum of 

 antenna grayish dull dark brown to ferruginous, more or less pale on 

 underside except usually at apex; scape greenish brown to cupreous; 

 femora green, bronzy, or brown with apices testaceous to ferruginous; 

 tibiae reddish testaceous to ferruginous; tarsi testaceous or reddish 

 testaceous; wings hyaline, very often with a small darldsh or brownish 

 spot or patch at apex of submarginal vein and sometimes with a faint 

 cloud below marginal vein; veins brown to ferruginous, paler basally. 



Male. — Length about 1.75-2.5 mm. Similar to female; portion of 

 scape bearing sensorial punctures not greatly broadened apically and 

 occupying somewhat over one-thu'd to nearly one-half of scape, 

 sensoria fine to moderately coarse. 



Type.— U.S.N. M. no. 18305. 



Remarks. — Redescribed from 11 females and 8 males, including 

 type, allotype, and paratype, all in the United States National Mu- 

 seum except four in the collection of the Academy of Natural Sciences 

 of Philadelphia. 



