AiMERICAN HYMENOPTERA. 283 



margin of prothorax yellow; scutelluru with sparse shallow punctures; basal 

 middle of metathorax above with about ten short longitudinal carinse, a patch 

 of dense grey pubescence on each side above the short subacute spine; wings 

 subhyaline, dusky at tips, in the posterior pair the anal and discoidal cells are 

 separated by a short transverse nervure; abdomen shining, sparsely and feebly 

 punctured, more distinctly at apex ; first segment entirely and the second be- 

 neath and at base and sides above, ferruginous, the second, third and fourth 

 segments above have sometimes a yellow apical spot on each side of the middle. 

 Length .20— .25 inch. 



% . — More densely clothed with sericeous pubescence, that on the head and 

 thorax above tinged with brown ; clypeus, spot on mandibles, scape beneath, 

 a line dilated medially, or two spots on posterior margin of prothorax, tubercles, 

 dot on tegulse, sometimes a spot on four anterior coxse beneath, extreme tips of 

 their femora, their tibipe in front, and a transverse line on each side at apex of 

 abdominal segments 1 — 5 above, yellowish-white; face, clypeus, cheeks, meso- 

 pleura and coxse silvery; scape large, robust, flagellum thickened at tips, the last 

 joint longer than the two preceding together, obtuse at tip and broadly emarginate 

 beneath : sometimes the ferruginous color of the abdomen is confined fo the first 

 segment, and the lateral yellow lines on apical margin of the segments reduced 

 to transverse spots; the apical segment above has a stout tooth on each side 

 at tip. Length .23— .25 inch. 



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



Wyssoii rilfiveiltris n. sp. — 9 • — Small, black, opaque, finely and densely 

 punctured, subsericeous; head and thorax immaculate; space between ocelli not 

 raised; basal middle of metathorax above with longitudinal rugae, a patch of 

 dense silvery-grey pubescence on each side above the rather long acute spine; 

 anterior tibise and tarsi more or less ferruginous; wings hyaline, tips dusky, 

 in the posterior jmir the anal and discoidal cells are separated by a short trans- 

 verse nervure; abdomen very densely and finely punctured, ferruginous, with 

 the two apical segments more or less blackish ; a yellowish-white spot on each 

 side at apex of segments 1 — 4 above, sometimes obscure. Length .20 inch. 



Ilab. — Montana, Colorado, (Morrison). Three 9 specimens. Differs 

 from rusticns chiefly by the densely punctured abdomen. 



Mysson piiniiliis n. sp. — %. — Black, opaque, finely and densely punc- 

 tured; ch'peus, mandibles except tips, base of antennae beneath, short line on 

 posterior margin of prothorax, tubercles, spot on tegulse, tips of four anterior 

 femora beneath, all the tibiae and tarsi, and a narrow band on posterior margin 

 of all the abdominal segments above except the last, yellow; apex of flagellum 

 thickened, testaceous, the ternnnal joint truncate at tip and emarginate beneath; 

 space between ocelli not raised; basal middle of metathorax above with fine 

 radiating longitudinal carinas, the lateral spines short and subacute; wings sub- 

 hyaline, in the posterior pair the anal and discoidal cells are separated by a pro- 

 longed longitudinal nervure; the two basal segments of abdomen, except discal 

 spot above, ferruginous; the narrow yellow bauds are slightly interrupted medi- 

 ally, the apical segments above broadly triangular and terminated by two short 

 approximated teeth. Length .17 inch. 



Hab. — Nevada, (Morrison). One specimen. 



