NORTH AMERICAN HYMENOPTERA. 231 



first recurrent nervure a little before the middle, third, obsoletely defined, ex- 

 tending a little beyond the marginal cell ; legs black, clothed with long hairs of 

 the same color, tibial spurs long; abdomen ovate, gradually narrowed behind, 

 basal segment nodose, coarsely i)unctured ; second segment shining ferruginous, 

 darker towards the base, finely punctured, thinly clothed with blackish hairs, 

 lateral carinpe distinct; ajjical segments clothed with long dense, black pubes- 

 cence, under side of entire abdomen closely punctured. Length 7 mm. ; expanse 

 of wings 13 mm. 



Hub.— Texas. 



Si>lii«ro|>lithaInia maeilenta Blake. 



Male. — Black ; head rounded, not as wide as the thorax, closely punctured, 

 thinly clothed with erect black hairs; eyes round, prominent; antenna' black; 

 thorax robust, gradually narrowed behind, closely punctured, thinly clothed 

 with erect black hairs ; metathorax abruptly rounded ; wings moderate, fuligin- 

 ous, marginal cell broad, short, and obtusely rounded at tip, second submarginal 

 subquadrate, not as large as the first, receiving the first recurrent nervure a little 

 before the middle, third submarginal obsolete ; legs black, thinly clothed with 

 pale hairs, calcaria long, rufo-piceous ; abdomen elongate ovate, basal segment 

 elongate, much enlarged at apex, shining, closely punctured ; second segment 

 ferruginous, shining, finely punctured, thinly clothed with erect blackish hairs ; 

 lateral carinte distinct, venti'al surface having a central black line ; apical seg- 

 ments closely fringed with long black hairs. Length 8.5 mm. ; expanse of 

 wings 13 mm. 



Hab. — Texas. 



Spliterophtlialina obscura Blake. 



Male. — Head black, rounded, closely punctured, clothed with obscure black 

 and golden hairs; eyes round, polished; antennae black, scape finely punctured; 

 thorax subovate, narrowed posteriorly, closely punctured, prothorax clothed 

 with obscure yellow hairs, metathorax coarsely reticulated ; tegulae convex, 

 punctured ; wings fuliginous, paler about the middle, marginal cell elongate 

 ovate, rounded at tip, first submarginal moderately large, second subquadrate, 

 receiving the recurrent nervure before the middle, third obsolete ; legs black, 

 clothed with black hairs, calcaria pale ; abdomen petiolate, black, closely punc- 

 tured, bearing a few erect black hairs ; second and following segments dark 

 brown, closely punctured, apical margins clothed with black pubescence, apex 

 bearing a few obscure yellow hairs. Length 8. .5 mm. ; expanse of wings 13 mm 



Hab. — Massachusetts. Collection of Pvof. Agassiz. 



Sphseroplitlialnia gibbosa Say. 



Male. — Body black ; witii numerous gray, but not concealing, hairs: densely 

 punctured, punctures large on the head and trunk; wings hyaline ; at tip and 

 including the radial cellule, fuliginous ; stigma moderate ; third cubital cellule 

 incomplete ; abdomen, fir.st segment petioliform, as long as the second and some- 

 what gibbous at tip, distinguished from the second by a deep stricture. Length 

 over three-tenths of an inch, 11 mm. (Say.) 



Hab. — Indiana. 



Resembles scrupea, but is larger, has a stigma and longer petiole ; 

 wings dusky at tip, and the petiole more gibbous at tip. 



