THE CANADIAN ENTOMOLOGIST 253 



Andrena hirticincta surda, Ckll. 



This was described from Colorado, the precise locahty un- 

 known. Mr. S. A. Rohwer took a male at flowers of Polygonum, 

 along with a female A. vierecki Ckll., at Boulder, Colo., Aug. 24, 

 1908. The occurrence of vierecki, a spring species, on this date is 

 surprising, and seems to indicate a second brood. 



Andrena pertarda, Ckll. 



A female was taken at Meeker, Colorado, Aug. 7, 1909 {Terry 

 Ducc) . 



Andrena apacheorum, Ckll. 



This occurs in Colorado; Green Mountain Falls, August 

 {J. W. Frey). 



Andrena tacitula grossulariae, V. & C. 



Only the male has been described. I took a female at flowers 

 of Prunus melanocarpa, Florissant, Colo., June 24. It looks like 

 A. cyanophila, but is quite distinct by the less broadly depressed 

 second abdominal segment, the details of area of metathorax, and 

 colour of hair on hind tarsi. It is also near to A . salicifloris, but the 

 metathorax is different. Clypeus very densely and coarsely punc- 

 tured, with a smooth median line; facial foveae narrow, separated 

 from eye only by a shining line, extending far below level of an- 

 tenna;; third antennal joint about as long as the two following 

 together; flagellum largely red beneath, broadly so apically; 

 mesothorax and scutellum strongly and densely punctured, but 

 disc of mesothorax posteriorly shining between the more widely 

 separated punctures; area of metathorax with strong longitudinal 

 ruga; stigma dark reddish; hair of head and thorax above fox-red; 

 abdomen shining, well punctured, second segment depressed a 

 little more than half; second to fourth segments with yellowish 

 white hair-bands at sides; hair at apex fawn colour; hair on inner 

 side of tarsi light reddish. 



Andrena nigritarsis, V. & C. 



Mr. S. A. Rohwer took both sexes at flowers of Opulaster 

 ramaleyi; at Boulder, May 23; also a female, June 1. The species 

 is close to A. fragariana Graen., but larger; it has the venational 



