THE CANADIAN ENTOMOLOGIST. 237 



either eye, two pairs of orbital bristles in the female wanting in the male, 

 frontals descending almost to base of second antennal joint, sides of face 

 bearing bristly hairs, and on the lower portion with several macrochaetae, 

 antennse from slightly over two-thirds to three-fourths as long as the face, 

 the third joint only slightly longer than the second, arista long pubescent 

 on basal half, thickened on the basal fifth, vibrissa? on a level with front 

 edge of oral margin, two or three bristles above each, cheeks three-fifths 

 as broad as the eye-height. Thorax gray pruinose, marked with three 

 black vittee ; three postsutural and three sternopleural macrochaetae, 

 scutellum bearing three long marginal pairs. Abdomen somewhat 

 polished, gray pruinose and with darker reflecting spots, last three seg- 

 ments bearing only marginal macrochaetae. Middle tibite each bearing 

 two or three macrochaetie on the front side near its middle, front pulvilli 

 of male as long as the last tarsal joint. Wings hyaline, tinged with yellow 

 at the base, costal spine longer than the small cross-vein, third vein 

 bristly at least half-way to the small cross-vein, calypteres white. Length, 

 8 to 10 mm. Oswego, N. Y. One male and three females collected in 

 July and August, 1895 and 1896, by Prof. Charles S. Sheldon, after whom 

 the species is named. Type No. 4069, U. S. Nat. Museum, 



ON SOME SMALL BEES FROM ARIZONA. 



BY T. D. A. COCKERELL, MESILLA, N. M. 



Some time ago Prof C. F. Baker sent me a lot of small bees 

 collected by Dr. R. E. Kunze' at Pha2nix, Arizona, May 12, 1897, " o'^ 

 willows and various low herbs." I have examined these with interest, as 

 they belong to genera not recorded from that region ; they prove to be as 

 follows : 



(i.) Perdita salicis, CkW., 1896. — ^. $. Very many specimens. 



(2.) Prosapis mesillce, CklL, 1896. — A few, mostly males. 



(3.) Halidiis jneii/oii, Ckll, 1895. — One 5- 



(4.) Halidus pseudotegidaris^ Ckll., 1896. — On April 12, 1897, I 

 took at flowers of Sisymbrium, in Mesilla, N. M., a single Halidus which 

 differed decidedly from Illinois H. tegularis, but, to my surprise, almost 

 agreed with the Mexican H. pseudotegularis, except that the wings were 

 clear. Now, among the Arizona bees I find examples oi pseudotegularis 

 with slightly dusky wings, as in the type of that species ; the second sub- 

 marginal cell is noticeably smaller than in iegularis, and receives the 

 recurrent nervure further from its end. 



