30 [April 



mixed with fuscous on the face ; clypeus deep blue, its anterior margin 

 truncate ; mandibles stout, black, channelled along the outer margin 

 and armed with three teeth, the inner one blunt and bifid, the apical 

 one rather long and acute; antennae slightly longer than the head, 

 black, shining;, flaoellum beneath tint>ed with rufo-testaceous. Thorax 

 dull blue-green, densely and finely punctured, clothed with pale ochra- 

 ceous pubescence, which is long above, and rather short and mixed 

 with fuscous beneath ; disk in front with a very finely impressed long- 

 itudinal line, and on each side above the tegulae, a minute shining- 

 spot; tegulae black, tinged with green, smooth and shining. Wings 

 subhyaline. faintly clouded ; nervures blackish. Legs black, shining, 

 sparsely clothed with short fuscous pubescence. Abdomen short, sub- 

 globose, dark blue-green, shining, densely, finely and confluently punc- 

 tured ; basal segment above thinly clothed with rather long whitish 

 pubescence, remaining segments with very short blackish pubescence, 

 having a sericeous appearance in certain lights ; beneath, the ventral 

 scopa is dense and black. Length 4 lines. 



Hah. — Pike's Peak, Colorado Territory. One specimen. Coll. Kntom. 

 Soc. Philadelphia. 



Closely resembles 0. atriventrU. but the head is proportionally 

 larger, the punctation of the abdomen is not so distinct, the pubescence 

 not so dense and is of a different color (jn the abdomen above. 



211. 0. distincta, n. sj). 



Female. — Head as wide as the thorax, dark greenish-blue, shining, 

 densely and finely punctured ; vertex and face thickly clothed with 

 long pale golden-yellow pubescence, slightly fuscous on the vertex ; 

 anterior margin of the clypeus slightly iridescent, and somewhat emar- 

 ginate ; antennfe rather longer than the head, black. Thorax dark 

 green with a slight bluish reflection, densely and finely punctured, 

 thickly clothed with rather long hoary pubescence, anterior margin of 

 the scutellum slightly impressed; tegulfe black, tinged with purple, 

 smooth and shining. Wings almost hyaline, having a very faint tinge 

 of fuscous ; nervures blackish. Legs black, slightly tinged with green, 

 shining, clothed beneath with short pale pubescence ; tarsi beneath 

 with fuscous pubescence. Abdomen short, broad, only slightly convex 

 above, densely and finely punctured, blue-green, shining; basal seg- 

 ment a])ove clothed with hoary pubescence, the remaining segments. 



