AMERICAN HYMENOPTERA. 279 



immaculate, the seventh above truncate at tip with a prominent tooth on each 

 side. Length .2(3 inch. 



Hah. — Nevada, (Morrison). Two specimens. 



IVysson aztecus n. sp. — 9. — Black, opaque; head sparsely punctured, and 

 together with the thorax clothed with a short appressed yellowish pubescence; 

 space within the ocelli not raised ; mandibles, tegulse, anterior femora beneath 

 and most of their tibi£e and tarsi, fulvous; posterior margin of prothorax, spot 

 on tubercles, transverse line on base of scutellum, broad band on apical margin 

 of first abdominal segment, notched on anterior middle, and a narrower band at 

 apex of second segment, interrupted medially, yellow ; mesothorax and scutellum 

 with deep, tolerably close punctures, the mesopleura more finely punctured; basal 

 middle of metathorax with several ill defined longitudinal carinse, the central one 

 most prominent, a patch of dense pale sericeous pubescence on each side above 

 the prominent obtuse spine; wings pale fusco-hyaline, in the posterior pair the 

 anal and discoidal cells are separated by a prolonged longitudinal nervure; 

 abdomen somewhat shining, strongly and sparsely punctured, more closely so on 

 apical segments. Length ..30 inch. 



Hah. — Mexico, (Suniichrast). One specimen. 



Nyssoil inellipes n. sp.— 9- — Black, opaque, coarsely punctured, clothed 

 with a very short sericeous pubescence, which is pale brownish above and whitish 

 or silvery beneath and on face, clypeus and cheeks; mandibles except base testa- 

 ceous; posterior margin of prothorax, tubercles, arcuate line at base of scutellum, 

 tip of metathoracic spines, short line on tip of four anterior femora beneath and 

 a lateral transverse line on apical margin of abdominal segments 1 — 4 above, long 

 and almost meeting on middle of first segment, short and widely separated on the 

 fourth, yellowish- white; posterior ocelli separated by two longitudinal, smooth, 

 shining subreniform tubercles; mesothorax and scutellum coarsely pitted; base 

 of metathorax above with eight or ten evenly spaced longitudinal rugae, the sides, 

 above the prominent obtuse spine, with a large patch of golden pubescence, pos- 

 terior face coarsely reticulated ; tegular, tips of four anterior femora, the posterior 

 pair entirely, and all the tibiae and tarsi, fulvo-ferruginous; wings subhyaline, 

 smoky at tips, in the posterior pair the anal and discoidal cells are separated by 

 a prolonged longitudinal nervure; abdomen deeply and rather closely punctured, 

 the apical margin of the segments with a fringe of short golden pubescence; 

 beneath, the second segment is coarsely and deeply punctured, sericeous with 

 glittering pile; apical segments piceous. Length .30 inch. 



% . — Rather more coarsely and deeply punctured ; sides of face and clypeus 

 densely clothed with silvery-white pubescence; apical joint of antennae truncated 

 at tip, but not emarginate beneath; legs, except coxae and trochanters, entirely 

 fulvo-testaceous ; bands on abdomen above scarcely interrupted on basal segment, 

 slightly so on second and widely on third and fourth, while the fifth has a small 

 yellow spot on each side ; ape.x of last segment truncate, with a short acute fulvo- 

 testaceous tooth on each side. Length .28 inch. 



Hah. — Colorado, Dakota, Montana, (Morrison). Three specimens. 



Nysson opulentus Gertstacker, Abhandl. d. Naturf. Gesellsch. zu Halle x, 

 114, "J, . — 9- — Black, opaque, covered with a silvery-grey sericeous pile, silvery 

 on face and clypeus; head deeply and closely punctured, a longitudinal tubercle 

 on inner side of each posterior ocellus; mandibles except base ferruginous; 



