1903.] NATURAL SCIENCES OF PHILADELPHIA. 583 



Nomada zebrata, Cress. 



The female varies a good deal in size, and looks much like N. mor- 

 risoni. I have before me the following specimens: Beulah, N. M., 

 8,000 feet, August, 1902, Id"; South Fork, Eagle Creek, White .Alts., 

 N. M., about 8,000 feet, August 16, 1 9 , collected by C. H. T. Townsend ; 

 Colorado Springs, Colo. (L. Bruner, No. 26), 1 ? . A female in Acad. 

 Nat. Sci. Phila., marked "Col. Snow" (I suppose from Colorado), 

 has precisely the colors of N. mnda, but from the broad scutellum 

 and postscLitellum, etc., I take it to be a form of zebrata, the two 

 species being very closely allied. 



Nomada elrodi, sp. n. 



6^. — Length about 10 mm., moderately slender; head and thorax 

 black, with rather abundant pubescence; short and grayish dorsally, 

 snow-white and conspicuously plumose on face, cheeks, pleura, etc.; 

 facial quadrangle broader than long, orbits not far from parallel; 

 labrum, mandibles except tips, broad band beneath eyes extending a 

 little beyond middle of posterior orbits as a narrow stripe, clypeus, 

 supraclypeal mark (covered by silver-white hair), and lateral face- 

 marks, lemon-yellow; lateral face-marks very broad, ending a short 

 distance above level of antennae, the end rounded and diverging from 

 the orbital margin; scape swollen but not excessively so, yellow in 

 front, reddish with two large black spots behind; flagellum reaching 

 to metathorax, bright ferruginous, the first four or five joints largely 

 black above; third antennal joint about half length of fourth, fourth 

 considerably longer than fifth; lateral borders of mesothorax red; 

 upper border of prothorax, tubercles, large transverse mark on pleura 

 (almost concealed by white hair), and most of scutellum, yellow^; post- 

 scutellum black; metathorax with four reddish-yellow spots, the upper 

 two on the enclosure; tegulae honey-color; wings long, not far from 

 clear, apex dusky, stigma bright ferruginous, nervures ferruginous on 

 basal half and fuscous on apical half of wing; second submarginal cell 

 little narrowed above, third large; basal nervure a moderate distance 

 basad of transverse medial ; legs red ; a spot at base of anterior femora 

 beneath, basal half of under sidt? of middle femora, and a suffused band 

 on hind femora beneath, black; abdomen light lemon-yellow; basal 

 half of first segment black, the edge of the black wavy; apical margins 

 of all the segments reddish, broadest and darkest on the first three; 

 apex slightly notched ; venter yellow with pale ferruginous (marginal) 

 bands, first segment ferruginous marked with a broad black V. 



i7a6.— ."Montana," one in Coll. of Acad. Nat. Sci. Phila. Named 



