OF WASHINGTON. 119 



SOME BEES OF THE GENUS HALICTUS. 



By T. D. A. COCKERELL. 



Halictus manitouellus, n. sp. 



?. — Length, 9 to 9.5 mm. ; black ; similar to H. trizonatus Cresson, 

 but averaging a little larger, with decidedly darker wings, especially at 

 apex, the stigma longer and redder; face broader; mesothorax dull, 

 with the punctures as close as is possible, and the hair scanty and 

 inconspicuous; area of metathorax with five longitudinal rugae, much 

 finer and closer than in H. sisymbrii; area with no sharp rim; trunca- 

 tion of metathorax with a very sharp rim below, but it fails above; 

 abdomen closely and exceedingly minutely punctured, with no median 

 band on first segment, nor any apical bands or discoloration; bases of 

 segments 2 to 4 with broad bands of tawny felt-like pubescence, very 

 conspicuous, narrowing medially on 2 and 3 ; apical segment with 

 mostly black hair; legs black, with pale hair; hind spur finely serrate; 

 tegulae shining black, with the edge broadly pallid anteriorly. In 

 Crawford's table (Jr. N. Y. Ent. Soc, Dec, 1907) it runs to H. bardus 

 Cress., but hairs fringing apex of clypeus are fuscous, the scutellum 

 is rather closely punctured, the stigma is not fuscous, and the abdominal 

 bands are strongly tawny. 



Cheyenne Canon, Colorado Springs, Colo., two at flowers of 

 Salix, May i8 (W. P. Cockerell) ; Manitou, Colo., April 29, 

 one at Salix, one at Ribes leptanthmn (T. D. A. and W. P. 

 Ckll.). The same year, in April, H. trizonatus was common 

 at flowers of Salix at Colorado Springs (W. P. Ckll.). 



The wings oi H. manitouellus are grayish, not yellowish. 



Halictus galpinsiae Ckll. 



Boulder, Colo., at flowers of Gaura, June 12, 1905, 7:30 p. 

 m. (W. P. Cockerell), 2 ?. These specimens were unfortu- 

 nately overlooked when I was preparing my tables of Boulder 

 County bees (Univ. of Colo. Studies, 1907). The stigma is a 

 lighter, brighter orange than that of H. aherrans. 



Halictus cooleyi Crawford. 



This recently described species proves to be one of the most 

 abundant and characteristic bees of the front range and foot- 

 hills in Colorado. Numerous specimens from Boulder, mostly 

 taken by my wife, show dates from April 30 to July 3 ; and the 

 females are recorded as visiting Hydrophyllum, Viola nuttaUii, 

 Ribes, Opuntia, Antennaria and Nothocalais. At Salina, 

 Boulder County, females were taken at Salix and Berheris 



