AMERICAN HYMENOPTERA. 211 



segment narrowly and the remaining segments broadly clothed at apex with 

 a very short dense appressed cinereous pile; a patch of short dense yellowish 

 pubescence on apical middle of fifth segment; venter piceous, apical margin 

 of segments dull testaceous. Length .40 inch. 



■^ . — The pubescence of thorax above sometimes tinged with fulvous: face 

 narrower than <^ and eyes larger, scape yellowish in front; four anterior tarsi 

 long and slender, nearly twice the length of the tibise, posterior legs incras- 

 sate; abdomen smaller than in J and more acuminate, apical segment biden- 

 tate and fulvous at tip, with a blunt tooth on each side at base. Length 

 .30— .35 inch. 



Hah. — Nevada, (Morrison). Twelve specimens. In some speci- 

 mens the abdomen above is almost entirely covered with the cinereous 

 pile. This and the next two species are allied to alhata Cress. 



Anthophora flexipes. — 9- — Small, same form as maculifrons,ar}d very 

 much like it in ornamentation ; a whitish stripe connects the broad band on 

 apex of clypeus with the spot on middle of face; the pile on segments 1 — 4 

 of abdomen above is of a pale cinereous color, while the two apical segments 

 are entirely black; otherwise there appears to be little or no difference. 

 Length .40 inch. 



'^ . — Eyes larger; face narrower and clothed, as also the tibise, with a dense 

 silvery-white pubescence; scape white in front, flagellum fulvous beneath; 

 tips of the four anterior femora and their tibise and tarsi mostly honey-yellow; 

 anterior tibise fringed behind with long pale hairs, their tarsi nearly twice as 

 long as the tibise, slender, the first joint curved and dilated at tip, blue-black 

 beneath and fringed with long black and white hairs, second joint short, 

 black, remaining joints longer, yellow, the apical spurs and claws black; 

 intermediate tibise short, dilated and covered with a dense white pile, their 

 tarsi extremely long and slender, being nearly four times the length of the 

 tibise, the first joint as long as the tibise, twisted flattened and fringed behind 

 with short black hair, remaining joints shorter, equal in length and sub- 

 filiform, the single spur at tip of the tibise long and very acute; posterior legs 

 incrassate, their tibise covered with a dense white pile, their tarsi a little 

 longer than the tibise, the first joint as long as the remaining joints taken 

 together, black, narrow at base, then suddenly dilated and then narrowed 

 to tip, and fringed behind with long black hair; abdomen much as in the 

 9 , but smaller, with the two apical segments black, apex bideutate. Length 

 .35 inch. 



Hab. — Nevada, (Morrison). Eight specimens. The tarsal struc- 

 ture of the S of this little species is exceedingly curious, all three 

 sets being differently formed. 



Anthophora exigua. — 9. — Form of the two preceding species, but 

 much smaller; black, clothed with a cinereous pubescence; thorax above 

 with short sparse black pubescence ; transverse mark on middle of face, 

 broad anterior margin of clypeus, labrum except upper corners, and base of 

 mandibles, white; vertex and occiput with a few black hairs; tegulse piceous, 

 margined with testaceous; wings hyaline; legs robust, densely clothed with 

 cinereous pubescence, the four posterior legs with black pubescence on under 

 side, basal joint of posterior tarsi broad, with an apical comb-like tuft of 



