1903.] NATURAL SCIENCES OF PHILADELPHIA. .577 



of metathorax, and middle and hind coxae; facial quadrangle nearly 

 square, laut broader above than long; mandibles except tips, rather 

 broad upper margin of labrum, rather broad anterior margin of clypeus, 

 and extreme lower corners of face sending a just visible line along 

 orbital margin up to level of antennse, all yellow more or less tinted 

 with reddish ; scape black ; fiagellum dark ferruginovis, becoming black- 

 ish above on basal two-fifths; third antennal joint shorter than fourth 

 seen from below, but a trifle the longer seen from above ; tubercles and 

 tegulse ferruginous; a very small but very distinct dull yellow spot 

 before each anterior corner of scutellum; postscutellum reddish in 

 middle, yellow at sides; upper border of prothorax with two small 

 3'ellow marks; scutellum, metathorax and pleura entirely black; legs 

 ferruginous, coxse and trochanters nearly all black; anterior femora 

 with a black mark beneath at base ; middle and posterior femora with 

 the basal and upper parts largely black or blackish ; most of the hind 

 surface of posterior femora black; hind tibiae with a j^ellowish-white 

 mark at base and one at apex, the later with a blackish cloud on each 

 side of it; apical pointed process of hind tibiae unusually long; wings 

 dusky at apex; stigma reddish-brown with a dark-brown margin; 

 second submarginal cell quadrate, little narrowed above; third niuch 

 narrowed above; basal nervure ending opposite transverso-medial, 

 slightly on the basad side; abdomen rather narrow, pale ferruginous; 

 first segment with basal half black, the black sending a pointed pro- 

 jection backward in the middle line; cream-colored marks as follows, 

 two oblique small marks on the red of first segment, large lateral 

 pyriform (pointed mesad) marks notched posteriorly on second, similar 

 marks so deeply notched anteriorly as to be almost divided into two 

 on third, broad band on fourth deeply notched laterally and very 

 slightly divided in middle line, transversely placed hour-glass-shaped 

 mark on fifth ; base of fourth segment and practically all of fifth except 

 the light mark, black; venter ferruginous more or less suffused with 

 blackish, and with four crescentic cream-colored marks. 

 Hab. — "So. Cal.," one in Coll. Acad. Nat. Sciences Phila. 



Nomada oregonica, Ckll. 



If ah. — "So. Cal.," one c in Coll. Acad. Nat. Sciences Phila. 

 Nomada bifurcata, sp. n. 



c^. — Length about 6 mm.; head and thorax black, with abundant 



long hair, the dorsal hairs brownish, the others white ; facial quadrangle 



nearly square; mandibles except tips, labrum, clypeus and lateral 



face-marks pale yellow; lateral face-marks broad below, rapidly nar- 



37 



