142 On Bees from New Mexico, 



Springs, Colorado, at the middle of July, is distinguished 

 from meliloti by its considerably larger size and the fact that 

 the tuo middle teeth at the end of the abdomen are con- 

 siderably broader than long. 



I have a single female from Soledad Canon, in the Organ 

 Mountains, which I think must belong to meliloti. It was 

 collected by Prof. C. H. T. Townsend on Aug. 15 on MeJam- 

 podium cinereum, DC. (det. E. 0. Wooton) ; it is extremely 

 like Sta. F^ cactoruin, but larger, about 6^ millim. long, and 

 has a noticeably larger head and broader face. 



Halictus ruidosensis, sp. n. 



5 . Length 6 millim. 



Head and thorax very dark Prussian green, abdomen and 

 legs black. Head ordinary, face broad ; eyes converging 

 above and below, so that the inner orbital margin is noticeably 

 curved -, face and front rough from the strong and extremely 

 close punctuation, dark blue-green ; except the clypeus and 

 supraclypeal area, which are olive-green with a coppery 

 lustre, the anterior margin of the clypeus broadly black. 

 The punctuation of the lower parts of the face is also much 

 less close than that above, and the clypeus and supraclypeal 

 area are minutely roughened with strong but quite sparse 

 punctures. Mandibles dark rufescent at ends; antennse 

 wholly very dark brown. Pubescence throughout dirty 

 white, with a faint yellowish tint, sparse on head and thorax, 

 but conspicuous in certain lights, not at all concealing surface 

 of face. Thorax dark blue-green, metathorax perhaps a little 

 bluer than the parts in front of it ; mesotliorax minutely 

 granular and strongly and quite closely punctured ; a distinct 

 median impressed line ; with a strong lens in a good light the 

 postscutellum and hind part of scutellum appear quite an 

 olive-green and the metathorax deep blue- black, strongly 

 contrasting; metathorax minutely granular, rather shining, 

 truncate, the distinct crescent-shaped basal area bounded only 

 by a rounded edge ; basal portion of enclosure finely rugose- 

 plicate. Tegulaj shining piceous, not punctured. Wings 

 hyaline, iridescent, slightly dusky towards apex ; nervures 

 and stigma piceous. Legs black, tibial spurs rufous, hind 

 leos quite densely pubescent. Abdomen moderately broad, 

 brown-black ; first segment sparsely and feebly punctured, 

 remaining segments more closely but still feebly punctured ; 

 hind margins of segments so narrowly and feebly testaceous 

 that it is not readily noticeable ; no hair-bands, but sides of 

 first three segments, and dorsum of hind part of third and all 



