66 PROCEEDINGS OF THE ACADEMY OF [1896. 



brownish-orange. Vertex granular. Head rounded. Face below 

 antenna yellowish-white, the upper border of the pale color coinci- 

 dent with the loAver level of the insertion of the antennje, except 

 that on each side of the dog-ear plate there is a notch formed by an 

 incursion of the dark color. Clypeus Avith a small black spot on 

 each side. Mandibles rufous at tips. Antennae dark above, below 

 dirty yellowish, the scape whiter. Sides of face with appressed white 

 hairs. Cheeks unarmed, rather densely clothed beneath with erect 

 white hairs. Sides of metathorax, and postscutellum, with similar 

 hairs. Tubercles yellowish-white, tegulse hyaline. Wings hyaline, 

 nervures very pale straw-yellow, third discoidal very weak, second 

 submarginal narrowing about one-half to marginal. Legs pale 

 yellow, a dark patch on anterior femora, and middle and posterior 

 femora and tibiae largely dark. Abdomen above bandless, first 

 segment dark at base. Venter entirely orange. (Ckll., 4,568, etc.). 



9 • — Closely similar, but the dog-ear marks and pale mark above 

 clypeus wanting, i. e., the pale color on face is confined to the clypeus 

 and triangular marks at sides of face. (Ckll., 4,573). 



Hab. — Albuquerque, N. M., in the old town at flowers of ChamoB- 

 saracha coronopus, Aug. 16, 1895, abundant. Also at Santa Fe, in 

 the capitol grounds, on flowers of C. coronopus, Aug. 2, 1895, two 

 specimens. At Santa Fe it was associated on the flowers with Halic- 

 tus S and Colletes. This species resembles P. semicrocea, but that 

 has the face dark in the 9 . 



A species from the transition zone in New Mexico, habits unknoum. 



21. Perdita foxi Ckll. Proc. Phila. Acad., 1895, p. 18. ^ (Hab., Santa Fe, N. M.) 



The unique type, taken on June 25th, is only known. The species 

 may be known by its orange-rufous legs, and black unhanded 

 abdomen. 



A species found on Sphoiralcea, very different in the sexes, ranging 

 in modified form over 3,200 feet altitude. 



22. Perdita sphaeralceae n. sp. 



9 . — Length 7 5 mm. Head and thorax dark greenish, abdomen 

 black with three light bands. Head rather small, rounded, some- 

 what broader than long, vertex and occiput dark olive-green, gran- 

 ular; a shining brassy prominence between the antennse; clypeus 

 black, shining, sparsely punctured toward the sides. No pale 

 marks on face, except a small yellow spot on extreme lower corner. 

 Mandibles brownish, ferruginous at apex, sharply and squarely 



