Genus Colletes /?*o?n }\eio Mexico. 47 



nervure black. Legs black, ordinary, claw-joint becoming 

 ferruginous. Abdomen short, convex, suboval, shining, with 

 small and sparse but distinct punctures. No black hairs. 

 First segment with long hairs at base and sides ; segments 1 

 to 5 with very distinct white apical bands of appressed hairs, 

 which bands are continued somewhat more narrowly on the 

 venter. First joint of flagellum almost as long as second. 



Hah. A few miles E. of Las Cruces, N. M., below the rise, 

 Sept. 27, 1896 (CM.; CI). 



Colletes gypsicolenSj sp. n. 



6 . Length about 11 millim. 



Closely related to Loinsce, but considerably larger, and the 

 dorsal pubescence of the head and thorax has a very delicate 

 yellowish tinge, not readily noticed under the lens, but con- 

 trasting with the white paper lining of the store-box, giving 

 the insect a quite distinct fades. Another peculiarity is 

 found in the mandibles, the rufescent ends of which are broad 

 and flattened, pointed at the tip, like a Roman sword. The 

 labium has merely a shallow median pit or concavity. Sides 

 of vertex closely and minutely punctured. Flagellum entirely 

 black. No prothoracic spine. Mesothorax with large, rather 

 close punctures. Enclosed quadrangles of base of meta- 

 thorax very few, the middle ones at least considerably broader 

 than long. Lateral areas of posterior truncation shining, 

 hairy, punctured. Tegulas extremely hairy. Wings per- 

 fectly hyaline ; nervures black, stigma pale ferruginous or 

 honey-colour. The wings are relatively somewhat shorter 

 than in Louism. Tarsi sometimes more or less ferruginous, 

 especially the hind tarsi, which may be conspicuously so. 

 Abdominal punctures very minute. White bands very broad 

 and distinct. Hind margin of sixth segment hyaline. 



Ilah. White Sands by Whitewater, N. M,, on flowers of 

 Bujelovia, Oct. 6, four males [C. II. T. Townsend; C 30). 



This interesting species is probably peculiar to the Wiiite 

 Sands, an enormous deposit of pure gypsum extending for 

 many miles, looking exactly like banks of snow. 



Colletes, sp. n. 



2. Length about 10 millim. 



Abdomen narrow, elongate, tapering, after the manner of 

 C. m'tidus, Smith, with very distinct white hair-bands. 

 When the segments are extended it is seen that tlie bases of 

 the second and third are hairy. I give this form no name, as 



