Dec, 1919.] Cockerell: Bees of Peaceful Valley. 299 



Halictus euryceps Ellis. 2 J, at PJiacelia, Aug. 26 (W. P. C). 



Halictus hemimelas Ckll. 1 J, Aug. 25. New to Colorado. The 

 abdomen is strongly brassy-greenish ; the type, from Xew Mexico, 

 has the abdomen faintly bronzy or greenish. In all other respects, 

 the Colorado specimen agrees with hemimelas, and I am confident 

 that it is the same species. 



Halictus synthyridis Ckll. 1 J*. 



Halictus (Chloralictus) phaceliarum new species. 



Female. — Length about 6.5 mm.; robust, with broad head, and eyes not 

 much converging below ; face and front olive-green, the front dull and granular, 

 clypeus mainly black ; cheeks and metathorax blue-green, the latter shining, 

 with a steely lustre, with minute punctures, sparse on disc; antennae dark, the 

 flagellum partly red beneath toward apex ; hair of face and thorax above 

 tinged with yellow, of cheeks and pleura clear white ; area of metathorax 

 large, with an oblique raised line at sides ; surface of area with delicate but 

 conspicuous plicae, complete at sides, but in middle weak and running into a 

 reticulation which does not reach the hind margin ; tegulae smooth, brownish 

 black; wings very faintly grayish, stigma and nervures pale dull reddish- 

 testaceous ; legs black, tarsi brownish at apex ; hind spur with long spines ; 

 abdomen polished, black (including hind margins of segments), not at all 

 metallic; third and following segments (third sparingly on disc), and sides 

 of second, covered with grayish pruinose pubescence. 



Peaceful Valley, Colo., Aug. 26, 1918, at flowers of Phacelia, col- 

 lected by W. P. Cockerell. 



Variety a. Mesothorax olive green; wings slightly reddish. 



Peaceful Valley, Aug. 27 (T. D. A. Cockerell). 



Closely related to H. subconnexus Ellis, but the sculpture of meta- 

 thoracic area is much more delicate, the eyes converge less below, and 

 the abdomen is without metallic tints. 



There are also in the collection several small species of Halictus 

 represented only by males. They do not agree with any identified 

 males, but they may have been described from females, as numerous 

 species are known only in that sex at present. 



CaUiopsis coloradensis Cresson. 1 $> Aug. 27, at Chrysopsis. 



Perdita affinis Cresson. 1 5, Aug. 27, at Chrysopsis. 



Panurginus porterae Ckll. 2 J\ Aug. 26, at Hcliomcris. 



Halictoides oryx Viereck. Both sexes; females at Hcliomeris. 



Pseudomelecta interrupta rociadensis Ckll. One. Aug. 26. 



