NORTH AMERICAN HYMENOPTERA. 227 



coidal and second submarginal cells, terminating in a streak, extending to the 

 first submarginal cell ; tegulaj round, polished ; abdomen roundly ovate, basal 

 segment petiolate, black, coarsely punctured, clothed with erect black hairs, 

 second segment dark ferruginous, finely punctured, clothed with long fulvo- 

 ferruginous pubescence, remaining segments black, densely clothed with long, 

 coarse, black pubescence ; ventral surface entirely black, second segment finely 

 punctured, shining. Length 9 mm. ; expanse of wings 16 mm. 



Hab. — Colorado. 



This species is allied to S. monticola Cresson, but may be separated 

 by the head and thorax being black, and the ventral surface entirely 

 so, and by the wings being fuliginous, whereas in monticola they are 

 fuscous. 



Spliaerophtlialnia castor Blake. 



Male. — Black ; head rounded, closely punctured, clothed with erect black hairs; 

 eyes round, prominent; thorax elongate subquadrate, anterior angles rounded, 

 densely punctured, thinly clothed with long black pubescence, metathorax 

 roundly truncate, closely reticulate ; tegulffi round, polished ; wings ample, black- 

 ish, marginal cell elongate subquadrate, truncate at tip, second submarginal sub- 

 triangular, wide beneath, receiving the first recurrent a little before the middle, 

 third subpentagonal, so much narrowed at base that its extreme nervure is op- 

 posite to and joins the second recurrent; legs black, thinly clothed with black 

 hairs; abdomen ovate, petiolate, petiole closely punctured, having a longitudinal 

 carina on each side, clothed with erect blackish hairs, disc dark ferruginous, base 

 and apical margin black, second segment having the basal half castaneous, apical 

 half bright ferruginous, apical margin and following segments black, clothed 

 with dense black pubescence ; under side of second segment castaneous, the ab- 

 dominal fovea large and deep. Length 1-2-18 mm. ; expanse of wings 19-27 mm. 



Hab. — Kansas, Texas. 



In some individuals the petiole and basal half of second abdominal 

 segment is entirely black. The neuration of the wings in this spe- 

 cies is similar to that of S. eontracta described by Say. 



Sphseroplithalina iiiacer u. sp. 



3Ial£. — Head transversely rounded, black, finely punctured, thinly clothed 

 with mixed pale and black hairs; mandibles and antennae black, eyes round and 

 prominent; thorax ovate, closely punctured, black, metathorax roundly trun- 

 cate, coarsely reticulate, lateral declivities of the mesothorax smooth and shining ; 

 legs black, thinly clothed with pale hairs, as well as thorax beneath ; wings fulig- 

 inous, marginal cell ovate roundly truncate at tip, first submarginal cell large, 

 pointed at base and apex, second subtriangular, and having a faint hyaline streak 

 longitudinally through its entire length, and receiving the first recurrent nervure 

 before the middle ; tegulaj round, finely and remotely punctured anteriorly ; 

 abdomen ovate, basal segment petiolate, black, coarsely punctured, second and 

 following segments finely punctured, feebly pubescent with black, fusco-ferru- 

 ginous, second segment paler on disc, apical margins fringed with blackish pubes- 



