AMERICAN HYMENOPTERA. 385 



30. Nomia Nortoni, n. sp. 



Female. — Black ; sides of face, cheeks, thorax anteriorly, posteriorly 

 and laterally, the legs, and base of abdomen, densely clothed with 

 ochreous-yellow pubescence;' antennae short, with the flagellum testa- 

 ceous beneath ; thorax rather closely and deeply punctured, scutellum 

 sparsely so, the latter impressed medially, (the mesothorax and scutel- 

 lum are shining and may be denuded of pubescence) ; nietathorax 

 truncate ; wings subhyaline, their apical margins fuliginous, nervures 

 brown-black ; second submarginal cell small, quadrate, the third as 

 long as the first and narrowed one-half toward the marginal, receiving 

 the second recurrent nervure between the middle and apex; legs ro- 

 bust, densely pubescent, especially the posterior pair, posterior tarsi 

 golden within ; abdomen ovate, shining, subconvex, the apical half or 

 one-third of the segments transversely impressed ; second, third and 

 fourth segments each with a beautiful emerald green apical margin ; 

 apical segments with black pubescence; ventral segments fringed 

 with ochreous pubescence. Length 11 lines. 



Male. — Differs much from the 9 ; the head is smaller, with the face 

 densely clothed with ochreous pubescence; the antennge are nearly as 

 long as the head and thorax, gradually attenuated to the tip, bright 

 fulvous, the scape above and a line on the flagellum above, brown-black, 

 the scape densely pubescent beneath, the joints very distinctly defined, 

 the terminal joint nearly as long as the basal joint and pointed at tip; 

 the anterior half of the mesothorax is densely clothed with fulvo-ochra- 

 ceous pubescence ; the four anterior tibife in front and their tarsi are 

 honey-yellow; the posterior femora arc short and enormously swollen, 

 being almost globose exteriorly, but are concave within ; their tibiae 

 are short, dilated posteriorly, and are dilated at tip beneath into an ir- 

 regularly shaped process, which is deeply excavated beneath the inser- 

 tion of the tarsi, and present, on the inner edge, three long, acute 

 spines; the tibiae are yellow, black at base; their tarsi are yellow, 

 dusky at tips, the basal joint very long, flat, and broader at base; the 

 abdomen is more depressed and subparallel, clothed, especially at base, 

 with short pale pubescence ; the apical fasciae of the second, third and 

 fourth segments are of a paler green, and the fifth segment has also a 

 greenish fascia, which does not, however, extend the whole width of 

 the segment; apex densely clothed with black pubescence; the apical 

 segment is emarginate at tip ; beneath, the second and third segments 

 present broad, flattened, slightly concave plates, each with a sharply 

 impressed line down the middle, the sides are densely pubescent. 

 Length 71 lines. 



TRANS. AMER. ENT. SOC. (49) FEBRUARY, 1868. 



