46 Mr. T. D. A. Cockercll oti Bees of the 



(ii.) Dorsum of thorax without any black hairs. 



a. Small males, with flagellum ferruginous beneath; tarsi ferruginous. 



Colletes prosopidisjS,^. u. 



6 . Length about 7 to 8i millim. 



Very near to G. dalece, the description of wliich, given 

 above, applies "with these exceptions : — The space between 

 eyes and base of mandibles is broader than long. Sides of 

 vertex are sparsely punctured. The flagellura is ferruginous 

 beneath. Hind third of scutellum only sparsely punctured. 

 Base of raetathorax sometimes as in dalece, sometimes not 

 distinctly separated into quadrate spaces. Nervures and 

 stigma fuscous or stigma dark ferruginous. Knees and all 

 the tarsi ferruginous, knees sometimes black, hind tibi?e some- 

 times ferruginous behind. Second abdominal segment with 

 very distinct punctures. 



Hab. Las Cruces, N. M. ; five at flowers of mesquite 

 {Prosojris), May 2; one on foliage of Populus, Campus of 

 Agricultural College, May 8 [Ckll. 2942). 



/3. Flagellum dark ; tarsi little if at all ferruginous, except in C. Annce. 



t runctuatiou of fir.-t abdominal segment feeble and spai-se. 



§ Cinereous species ; no hair-band at base of second abdominal segment 

 in the males. (Compare also C. salicicola.) 



CoIIetes Louisce, sp. n. 



6 . Length about 8 millim. 



Black, with rather dense greyish-white pubescence, stoutly 

 built, not slender like dalece and 2^'^'oso]){dis. Head rather 

 broad, vertex distinctly convex seen from in front ; face 

 densely covered with long silvery white hair ; sides of vertex 

 strongly but sparsely punctured ; labrum with three longi- 

 tudinal grooves, the lateral ones strongest. Mandibles dark, 

 rather unusually slender, the notch some distance from the 

 tip ; space between eyes and mandibles a little broader than 

 long. Antennaj wholly dark, not so long as in dalece and 

 prosojndis. Pubescence of thorax tolerably dense, but not 

 particularly long ; mesothorax with rather sparse but very 

 large and distinct punctures; scutellum sparsely punctured, 

 densely on hind margin ; base of metathorax bounded by 

 a sharp ridge and divided by sharp ridges into quadrangular 

 spaces. Prothoracic spine absent or concealed by the pubes- 

 cence. Tegulffi shining fuscous, finely punctured. NVings 

 perfectly hyaline j nervures and stigma fuscous, subcostal 



