1903.] NATURAL SCIENCES OF PHILADELPHIA. 567 



ish, nervures dark brown, stigma ferruginous; second submarginal cell 

 moderately, third greatly, narrowed above; transverso-medial nervure 

 a little basad of basal ; abdomen banded with black and yellow ; 3'ellow 

 band on first segment constricted but not divided in the middle ; bands 

 on second and third segments narrower in the middle than at the sides, 

 but not abruptly constricted like that on first; bands on fourth and 

 fifth segments broad throughout, not narrowed in middle; sixth seg- 

 ment all yellow; apical plate dark brown, notched; venter yellow, with 

 the bases of the segments black; first ventral segment dark with a 

 yellow mark shaped something a sheep's skull. 



Hab.— Santa Cruz Mts., Cal. (U. S. Nat. Museum). 

 Nomada (Xanthidium) subsimilis, sp. 11. (civilis, subsp.?). 



cJ^. — Length 8^ mm., black and yellow, head and thorax thickly 

 clothed with long erect coarse hair, yellowish-white below, brown above ; 

 scape also hairy. Tegulse yellow; nervures and stigma ferruginous; 

 basal nervure a little basad of transverso-medial; metathorax and 

 scutellums entirely black; basal area of metathorax with minute longi- 

 tudinal ridges ; tibiae yellow, each with a black spot behind, femora with 

 a black stripe behind. In all respects very closely related to N. civilis, 

 from Cresson's description of which it differs thus : Supraclypeal mark 

 well developed; flagellum mostly black above; anterior margin of 

 yellow band on first segment straight. These characters are not very 

 important ones, but I have N. civilis from Colorado, and am confident 

 that the Californian species is distinct, though it may prove that it 

 should rank only as a subspecies. The dark hair on the thorax of 

 subsimilis is a good distinguishing character. 



Hab. — Los Angeles county, Cal., February {Coquillett). In V. S. 

 Nat. Museum. Two specimens. 

 Nomada (Xanthidium) coquilletti, sp. n. 



c?. — Length about 9 mm., rather slender, black and yellow, legs red 

 with some yellowish and black. Head and thorax wdth abundant 

 brownish-white hair, dense and silvery on middle of clypeus and supra- 

 clypeal area; eyes brownish-gray; facial quadrangle nearly square, a 

 little narrowed below; basal part of mandibles, labrum, clypeus, stripe 

 beneath eyes, and narrow lateral face-marks extending to level of 

 antenna, pale yellow; scape swollen, hairy, yellow in front and black 

 behind; flagellum ordinary, bright ferruginous, the three basal joints 

 black above; third antennal joint conspicuously shorter than fourth; 

 thorax dull and very densely punctured, a stripe on upper margin of 

 prothorax, tubercles, flame-like mark (very not large) on pleura, and 

 tegulse, dull yellow ; no yellow on metathorax or scutellums ; legs pale 



