Records of Bees, 485 



Prosopis personatella, sp. n. 



? . — Length about 5'5 mm. 



Head, thorax, and abdomen entirely black, without light 

 markings ; flagellum dull ferruginous beneath ; head broad; 

 front and vertex dull and very finely punctured, but region 

 behind tips of eyes shining; mesothorax dullish, extremely 

 minutely and closely punctured ; scutellum broad and flat, 

 shining, the punctures distinctly separated ; metathorax dull, 

 the area roughened; tegulse black. Wings very ample, clear 

 hyaline, nervures and stigma piceous ; second s.m. large and 

 long. Legs black, the hind tibiae with rather more than the 

 basal fourth cream-coloured. Abdomen shining, first segment 

 with very minute, widely separated punctures, second micro- 

 scopically lineolate. Under the compound microscope the 

 base of metathorax appears cancellate. 



Hah. Corona, Colorado, above timber-line, at flowers of 

 Erigeron pinnatisectus, July (L. A. Kenoyer). 



Readily known by the entirely black face, combined with 

 the rather small size and ordinary antennas. It has some 

 superficial resemblance to the smaller P. saniculce, Rob. At 

 the same place and flowers Mr. Kenoyer took a male which 

 I referred to P. coloradensis, Ckll., for, although it looks a 

 little different from typical specimens of that species, there is 

 nothing tangible on which to separate it. The female 

 described above differs from coloradensis {tuertonis, Ckll.) 

 not only by its black face, but also by the long second s.m. 

 The mesothorax of tuertonis is much more deeply and strongly 

 punctured. It therefore seems that we have to do with a 

 distinct species, not a variety of coloradensis, and that the 

 male coloradensis is not conspecific. 



Prosopis varifrons, Cresson. 



Females from Florissant and Boulder, Colorado, are recog- 

 nizable by their relatively large size; lateral face-marks 

 ending about the level of antennas, where they are very 

 obliquely truncate (approaching the form of those in the 

 male) ; first abdominal segment very smooth and shining, • 

 second finely and distinctly punctured, in complete contrast. 

 Metz (Trans. Am. Ent. Soc. xxxvii. pi. ix. fig. 130) figures 

 as female varifrons an unusual variety or some other species. 

 P. subtristis, Svvenk. & Ckll., appears to be a race of vari- 

 frons, as was suggested in the original description. Metz, 

 who makes subtristis a variety of P. episcopalis, Ckll., 



