AMERICAN HYMENdPTERA. 281 



tiireil, tlie spnoe within ocelli iirotiil)el-ant : apex of soape, mandibles and palpi 

 ferruginous : thorax rather deeply and coarsely punctured, conlluently so on 

 mesopleura; posterior margin of prothorax, tubercles, arcuate line at base of 

 scutelkun, and posterior margin of abdominal segments 1 — 4 above, more or less 

 interrupted medially on 2 — 4, and spot on sides of segment five, white; some- 

 times the line on sides of segment four is reduced to a spot; basal middle of 

 metathorax with short longitudinal rugse, the spines acute; tegulse, legs and 

 basal segment of abdomen, and sometimes the extreme sides of the second 

 segment above and beneath, ferruginous; the coxse and tarsi ai-e more or less 

 fuscous: wings subhyaline, in the posterior pair the anal and discoidal cells 

 are separated by a jjrolonged longitudinal nervure; abdomen rather sparsely 

 and deeply punctured on basal segments and more densely and coarsely so on 

 the apical segments. Length .25. — .27 inch. 



Hob. — Montana, (Morrison) ; Texas, (Belfrage). Six specimens. 



Nysson basilaris n. sp.— 9- — Black, opaque; head and thorax deeply, 

 coarsely and somewhat conlluently punctured; face and cdypeus clothed with 

 silvery pubescence; on inner side of each posterior ocellus a prominent, shining, 

 longitudinal, subreniform tubercle; scape tinged with ferruginous; scutellura and 

 base of metathorax above longitudinally rugose ; tubercles, tegulse, legs except 

 coxse, and basal segment of abdomen, ferruginous; wings fusco-hyaline, in the 

 posterior pair the anal and discoidal cells are separated by a prolonged longitudinal 

 nervure; coxse and posterior tarsi black; abdomen robust, strongly punctured, 

 closely so on apical segments; a rather narrow yellowish-ferruginous band on 

 posterior margin of segments 1 — 4 above, that on the first slightly interrupted 

 medially, and widely so on the third and fourth; apical margin of the segments 

 with a narrow fringe of yellowish pubescence. Length .25 inch. 

 Hah. — Georgia, (Ridings). One specimen. 



Nyssoil tristis n. sp. — %. — Black, opaque, head and thorax above densely 

 anil finely jjuiictured ; sides of face, clypeus, spot between base of antennae, cheeks, 

 sides of thorax and venter, clothed with a fine silvery-sericeous pubescence; 

 clypeus except apical margin, spot on mandibles, scape more or less in front, 

 interrupted line or median spot on posterior margin of prothorax, sometimes 

 a spot on tubercles, a spot or line at base of four anterior femora behind, a spot or 

 short line at base of four anterior tibi?e, sometimes much reduced, and a transverse 

 spot on lateral apical margin of segments 1 — 4 of abdomen above, those on first 

 segment largest and more or less emarginate anteriorly, those on fourth segment 

 small, all yellowish-white ; upper anterior orbits sometimes golden ; anterior tibirc 

 and base of their tarsi sometimes testaceous; tubercle between insertion of antenna? 

 unusually prominent; scape large, more than twice longer than broad, flagellum 

 thickened to tip, the terminal joint as long as the two preceding together, deeply 

 emarginate beneath: space between ocelli not raised: mesopleura rugose; base 

 of metathorax above with about ten tolerably evenly spaced coarse longitudinal 

 rugse, the interstices smooth and shining, spines prominent and subacute; wings 

 subhyaline, the apical margin smoky; in the posterior wings the anal and dis- 

 coidal cells are separated by a short transverse nervure; legs with a silvery 

 sericeous pile especially at base; abdomen above finely and rather sparsely 

 punctured, the apex of seventh segment truncate, with a short tooth on each 

 side. Length .28— .30 inch. 



Hah. — Washington Territory, (Morrison). Four specimens. 



TRANS. AM. ENT. SOC. IX. (66) MARCH, 1882. 



