564 PROCEEDINGS OF THE ACADEMY OF [Aug., 



}jab. — ^"So. Cal./' two in Coll. Acad. Nat. Sci. Phila. Very distinct 

 by the character of the anterior femora. Aside from this, the entirely 

 black pleura and absence of supraclypeal mark distinguish it from 

 N. rivalis, N. suda, N. vincta, etc. 



Nomada (Micronomada) formula, Viereck. 



Hah. — San Pedro, .Cal., July 11 (Cockerell). This has the second 

 submarginal cell as in Robertson's genus Cephcn, but I cannot separate 

 the latter from Micronomada. N. flavipes, Prov. appears from the 

 description to be near to N. formula, but not identical. 



Nomada (XantMdium) crotchii var. nigrior, n. var. 



$ . — Length about 9 mm. ; the dark markings of abdomen black (not 

 ferruginous), sharply contrasting with the creamy-white bands; hind 

 margins of segments narrowdy subhy aline and pale brown; metathorax 

 black without spots. Basal nervure meeting transverso-medial, or very 

 slightly basad of it. 



Hab.—"So. Cal.," five in CoU. Acad. Nat. Sci. Phila. 



Nomada (Xanthidium) pascoensis, sp- n. 



J^ .—Length about 8 mm. ; yellow and black. Head and thorax very 

 densely punctured, hoary with white hair, which is dense on the face, 

 but not so as to hide the surface; basal part of mandibles, labrum, 

 clypeus (except a sutural spot) on each side, supraclypeal mark, lateral 

 face-marks and a flame-like mark beneath eyes, lemon-yellow; the 

 lateral face-marks fill in the whole space between the clypeus and the 

 eyes, but level with the supraclypeal mark suddenly narrow, and con- 

 tinue along the orbital margin as a rather broad band which ends 

 (slightly swollen) at the level of the antennae; thus the lateral face- 

 marks above present some resemblance in outline to the head of a 

 human femur; eyes green; scape much swollen, yellow in front and black 

 behind; flagellum reddish-orange, the basal joints largely black above, 

 apical joint long and pointed; third antennal joint triangular, about 

 half as long as fourth, joints beyond oblique, 5 to 7 or 8 with minute 

 denticles; flagellum crenulated; subtriangular patch on anterior part 

 of pleura, upper margin of prothorax, tubercles, teguke, scutellum 

 except margin, a small spot before each anterior corner of scutellum, 

 and band on postscutellum, all lemon-yellow; metathorax all black; 

 wings moderately dusky, stigma ferruginous; basal nervure almost 

 meeting transverso-medial, a mere fraction basad of it; second sub- 

 marginal cell quadrate ; legs red ; basal part of first four femora beneath, 

 hind femora Ijehind except apically, a suffused patch on hind tibiae 

 behind, and all the coxa?, black; knees, anterior legs in front (more or 



