262 AMERICAN HYMENOPTERA. 



yellow; wings fuscous, but not deeply so, nervures and stigma brown ; front, in- 

 cluding clypeus, very coarsely and quite closely punctured ; metathorax com- 

 pletely areolated ; abdomen, including basal segment, broad, punctured, apex not 

 excavated above; spurs on claws short and close and extending to apex. 



One specimen from Texas (type, coll. Amer. Ent. Soc). 



Moiioblastiis Tarifrons Cress. (TrypJion), Trans. Amer. Ent. Soc. ii, 104, % . 



Tryphon scutellaris Cress., ibid. 104, J . 



TrypJwn frontalis Cress., ibid. 109, 9 • 



Tryphon dufresnii Prov., Faune Ent. Can. ii, 411. % . 

 % J . — 5-7 mm. Head and thorax black ; abdomen usually rufous with basal 

 and apical segments black or piccous, but sometimes the whole abdomen, or nearly 

 all, is piceous; legs vary from entirely pale rufous to rufous, with four anterior 

 coxae and trochanters yellowish white, or more or less of posterior coxse black, 

 and sometimes the trochanters and apex of tibije and tarsi of hind legs, dusky ; 

 face, including clypeus, mouth-parts, tegulse, spot in front and almost always 

 more or less of scutellums, yellow ; occasionally the face is only partly yellow ; 

 antennae brown ; wings subhyaline, nervures and stigma brown ; face finely 

 punctured, and the clypeus has a slight impression between it and the front; 

 metathorax completely areolated ; abdomen slightly excavated behind for ovi- 

 positor; tarsal claws pectinate on basal two-thirds with strong short spurs. 



Thirteen specimens from Canada, New Hampshire, Massachusetts, 

 Connecticut, Michigan, Illinois (Dr. Nason), Montana and Florida 

 (Mrs. Slosson). Type, coll. Amer. Ent. Soc. 



iflouoblastus aciculatus n. sp. 



% . — 8 mm. Rufous, with thoracic sutures, anterior mesosternum and anterior 

 and posterior metathorax, black; face, mandibles and tegulse. yellow; antennae 

 rufous at base, dusky at apex ; wings yellowish, subhyaline. nervures and stigma 

 reddish brown ; parapsidal grooves present ; metanotum lacks the transverse 

 basal carina; first two abdominal segments longitudinally aciculate; flagellum 

 slightly enlarged in the middle ; tarsal claws pectinate on basal half with strong 

 sparse spu I'S. 



One specimen from ^Montana (type, coll. Amer. Ent. Soc). 



POLYBL,ASTlJS Hartig. 

 (Wiegemann's Archiv. f. Naturg.. Jahrg. 3, H. 2, p. I'wa, 158. 1837.) 



Head transverse, inflated behind eyes, oval in front ; eyes placed 

 low and well in front ; clypeus distinctly separated from the face by 

 a deep groove, narrow, elliptical, and with small transverse ridge 

 near the base, which is usually a dividing line in color also ; antennse 

 moderately long. Thorax gibbous, pilose, polished, sparsely punc- 

 tured ; parapsidal grooves indicated anteriorly ; scutellum broad, 

 flat above and with lateral carinse ; metathorax rugosely punctured, 

 completely areolated. Abdomen pilose, coarsely punctured at base, 

 polished at apex, broad in middle, narrowed at base and apex ; basal 

 segment sessile, slightly widened at apex, carinse present. Wings 



