212 E. T. CRESSON. 



black pubescence as in maculifrons ; abdomen convex, entirely covered above 

 with cinereous pile, extreme apex black; venter piceous, shining. Length 

 .30 inch. 



■^ .—Closely resembles the 9, the face narrower and more pubescent, the 

 eyes larger, the scape whitish in front, the thorax not clothed with black 

 above, the legs more slender, the tarsi longer, more slender, but simple, and 

 the abdomen smaller and narrower. Length .25 inch. 



Bah. — Nevada, (Morrison). Eight specimens. 



Aiithopliora so<lalis. — % . — Black; head, thorax and base of abdomen 

 clothed with a rather long, dense ochraceous pubescence, that on thorax 

 and base of abdomen above strongly tinged with ferruginous; sides of face, 

 elypeus, line above, labrum, dot on base of mandibles and spot on scape in 

 front, white; wings faintly dusky on apical margins; legs thickened, espe- 

 cially the posterior pair, and simple, except basal joint of posterior tarsi 

 which is broad, flat and having a stout subacute tooth within near the base, 

 posterior femora subfusiform; abdomen with the two basal segments above 

 clothed with a short fulvo-ferruginous pubescence, that on remaining seg- 

 ments short and black, mixed with pale on apical margin of the third; 

 terminal segment bidentate ; venter with a patch of long pale pubescence 

 near apex. Length .55 inch. 



Ilab. — Nevada, (Morrison). One specimen. 



Anthophora centriformis.— % .—Black ; head, thorax, legs and basal 

 segment clothed with a dense cinereous pubescence, that on thorax above 

 tinged with ochraceous; sides of face, elypeus, transverse mark above, labrum 

 except a piceous spot on each side, base of mandibles and scape in front, 

 white; third joint of antennae slender, dilated at tip; wings hyaline; legs 

 thickened, especially the posterior pair, basal joint of posterior tarsi broad, 

 flat, dilated on inner edge near tip, the other tarsi simple; abdomen narrowed 

 to apex, shining, with a very short sparse black pubescence on second and 

 remaining segments, more or less mixed with pale on the lateral apical 

 margins; terminal segment obtuse, with a patch of white pubescence on 

 each side; venter with cinereous pubescence on middle of the segments. 

 Length .55 inch. 



Hab. — Nevada, (Morrison). One specimen. This has much the 

 form and general appearance of certain species of the genus Centris. 



Xylocopa arizoiiensis.— 9.— Shining black, with a strong dark or 

 steel-blue reflection; cheeks, thorax except disk above, and the legs, clothed 

 with black pubescence; head opaque, deeply punctured, densely so on face; 

 the two posterior ocelli sunken, carinate in front; face depressed about base of 

 autenuffi, with a short tubercle in front of anterior ocellus ; labrum emarginate 

 at tip; thorax deeply punctured, smooth and shining on disk of mesothorax 

 and base of scutellum; wings violaceous-black; abdomen sparsely punctured, 

 sides of ventral segments fringed with black pubescence. Length 1 inch. 



-^.—Shorter and more robust than 9, the blue color rather more brilliant, 

 the pubescence more dense, that on mesothorax anteriorly, sides of pleura and 

 on basal segment of abdomen more or less pale; face much narrower, eyes 

 larger and labrum not emarginate at tip. Length .85 inch. 

 Hab. — Arizona, (H. Edwards). Two specimens. 



