Genus Colletes from New Mexico. 51 



cell narrower than usual. Legs with pale grey pubescence, 

 white on first four femora. Tibial spurs pale ; hind spur of 

 hind tibia barely ciliate. Abdomen broad, suboval, shining ; 

 first segment with very distinct but very sparse punctures ; 

 second segment more closely punctured, the punctures perfectly 

 distinct on a shining surface ; first segment with a thin pale 

 grey pubescence all over ; segments 1 to 5 with broad apical 

 bands of white hair, which are not continued on to the venter. 

 Bases of segments also pubescent. No black hairs. 



Var. a. — Posterior triangle of thorax without ridges. 



Hah. Las Cruces, N. M., on Salix, May 2 and o. 



This is much like Louisce, but flies at a different time of 

 year. In salicicoJa the stigma is black, in Louisce it is ferru- 

 ginous and tapers more at the end. There is little difference 

 in the punctuation of the abdomen. C. Louisce. has conspicuous 

 white ventral hair-bauds, which are wiiolly lacking in 

 salicicola. 



XX. Punctuation of first abdominal segment relatively strong and 

 close ; summer and autumn species. 



Colletes americana, Cresson, 1868. 



I have several lots of specimens which must be referred to 

 americana^ for, although they present ditferences among 

 themselves, I fail to find satisfactory specific characters to 

 separate them. Nevertheless, it is probable that one or two 

 segregates may be established hereafter with close study of 

 more abundant material. The specimens referred to are : — 



(1) A female from Watrous, N. M., 6200 feet, July 13. 



Peculiar for its sharp mandibles, with the notch 

 very distinct and a good distance from the end. 

 Abdomen very pubescent, including bases of second 

 and third segments. 



(2) A female. Las Vegas, N. M., July. Mandibles 



blunt, with the notch very near the end. Abdomen 

 hairy, as in the Watrous example. 



(3) Six males, Tuerto Mountain, near Santa Fe, N. M., 



7850 feet, Aug. 1, flying over damp sand in* 

 numbers. Mandibles sharp, notch near end. 



(4) A male, Santa Fe Caiion, N. M., 7625 feet, on 



floweis of liudheckia laciniuta, Aug. 11. 



(5) Santa Fe, N. M. One female, Mr. Bojle's garden, 



July '25, 1895, at flowers of Sphceralcea angusti- 

 folia. One male, July 25, 1S91. One male, 

 July 18, at white Clematis flowers. 



4* 



