no. 2064. BEES OF GENUS ANDRENA—VIERECK AND COCKERELL. 7 



A. tacitula has a similar red-haired form (grossulariae) , but it has a 

 different area of metathorax and different venation. 



b 8 . Second abdominal segment in middle depressed less than one-half. 



a 9 . Stigma and nervures clear amber; second submarginal receiving first recurrent 



nervure near end; hind tarsi clear red. (Area of metathorax much more coarsely 



sculptured than in A. clay teniae.) 



ANDRENA CRATAEGIPHILA, new species. 



Boulder, Colorado. May 10, at flowers of Crataegus coloradensis 

 Nelson. (T. D. A. Cockerell.) 



Male. — Length, 7J mm. Black, with pale ochreous hair. Facial 

 quadrangle broader than long. Eyes diverging above. Process of 

 labrum truncate. Clypeus very densely punctured. Antennae long. 

 Flagellum dark brown beneath; third antennal joint not quite as long 

 as fourth. Cheeks normal. Mesothorax dullish, with small shallow 

 punctures. Scutellum more shining. Area of metathorax shining, 

 with strong longitudinal ridges. Tegulae rufopiceous. Wings dusky 

 hyaline, nervures and the large stigma ferruginous; basal nervure 

 falling just short of transverse median. Second submarginal small, 

 receiving the first recurrent nervure near its end. Small joints of all 

 the tarsi, and hind tarsi entirely, clear ferruginous. Abdomen convex, 

 shining, without distinct punctures. Narrow hind margins of seg- 

 ments testaceous. Second segment in middle depressed about one- 

 third. Sides of second and following segments with rudimentary hair 

 bands. Apical plate with a rather rounded truncation. 



ANDRENA CRATAEGIPHILA, variety. 



Boulder, Colorado. March 30, at Salix bebbiana. (S. A. Rohwer.) 

 Male. — Length, 9 mm. Black, with pale slightly ochreous pubes- 

 cence. Facial quadrangle broader than long. Process of labrum 

 truncate. Clypeus shining but densely punctured. Facial foveae 

 seen from above white, extremely narrow, hardly as broad as the 

 width of an ocellus. Flagellum thick, bright ferruginous beneath. 

 Third antennal joint about as long as fourth. Cheeks normal. 

 Mesothorax dullish, with small not dense punctures. Scutellum 

 shining, sparsely punctured. Area of metathorax with large irregu- 

 lar wrinkles. Tegulae rufopiceous. Wings reddish hyaline, nerv- 

 ures and the large stigma ferruginous, basal nervure falling a little 

 short of transvere median, second submarginal broad, receiving first 

 recurrent nervure at its end. Small joints of anterior and middle 

 tarsi, hind tarsi entirely and a large part of hind tibiae ferruginous. 

 Abdomen very finely punctured, extreme hind margins of second 

 and following segments red. Second segment in middle depressed 

 about one-third. Rudimentary hair bands at sides of second and 



