386 E. T. CRESSON. 



One 9 specimen. Described from three 9 , 'ind one % , specimens. 

 The % and one 9 "^'^s found in Colorado by Mr. James Ridings, and 

 one 9 5 i" tli6 collection of Mr. Edward Norton, is from Kansas. 

 .31. Nomia 1 apacha, n. sp. 



Female. — Black, shining, the head, sides of thorax, mesothoras, 

 postscutellum, legs, sides and apex of abdomen and the apical margins 

 of all the segments, densely clothed with short, dull yellowish pubes- 

 cence; second joint of antenna) dull rufous; metathorax truncate and 

 subexcavate behind ; tegulae very large and pale fulvous ; wings yel- 

 lowish-hyaline, the apical margin fuscous, stigma and costal nerve ful- 

 vous ; tibise and tarsi more or less fulvous, the posterior legs with the 

 pubescence long and d^nse, basal joint of tarsi large and flat, claws 

 cleft; abdomen oblong-ovate, subconvex, the segments transversely im- 

 pressed at base and apex, the first segment deeply and angularly exca- 

 vated at base and transversely impressed on the middle; apical mar- 

 gins of the first and second segments rufo-testaceous and pubescent 

 only on the sides ; ventral segments densely fringed with long dull 

 fulvous pubescence. Length 7 lines. 



One 9 specimen. This also occurs in Colorado. 

 :-52. Perdita? albipennis, n. sp. 



Female. — ^Head and thorax dark metallic green, the latter above 

 brassy -green ; rather thickly clothed with erect whitish pubescence; 

 clypeus polished, tinged with purplish at tip, a longitudinal yellow line 

 down the middle and a transverse yellow spot on each side; mandibles 

 long, curved at tip, fulvous on the middle; antennas short, black above, 

 testaceous at tip and beneath, the scape yellow beneath ; a subinter- 

 rupted line on prothorax, and the tubercles, yellow; tegulae testaceous; 

 wings whitish-hyaline, with an opaline iridescence, nervures and stigma 

 white; wing-cells arranged as in Perdifa, except that the marginal 

 cell is a little longer; legs black, paler at tips, thickly clothed with 

 pale pubescence, especially long and dense on the four posterior tibiae; 

 abdomen ovate, flat, blackish, apical margins of segments subtestaceous, 

 a dot on each side of first segment, a broad band at base of the four 

 following segments, slightly sinuous behind and narrowest on second 

 segment, lemon-yellow ; apical segments pale fulvous, clothed with 

 wjntish pubescence; beneath, the segments are blackish, with pale api- 

 cal margins, and subpubescent. Length 84 lines. 



One 9 specimen. Also found in Colorado. 

 y>'i. Anthidium occidentale, n. sp. 



Female. — Black, densely punctured, head and thorax clothed with 

 a dense white pubescence, long on the cheeks and sides of the meta- 



