1S(U.] 25 



shining, clothed with black pubescence, the anterior femora beneath 

 with long ochraceous pubescence; apical joints of the tarsi ferruginous. 

 Abdomen subovate, deep blue, densely and finely punctured, the basal 

 segment as well as a portion of the second segment, clothed with ochra- 

 ceous pubescence, that on the basal segment long; remaining segments 

 with short black pubescence ; apical segment notched in the middle ; 

 beneath, the pubescence is black. Length 4i Hues. 



Hah. — Pike's Peak, Colorado Territory. Two specimens. Coll. 

 Bntom. Soc. Philadelphia. 



Resembles in form some of the males of 0. lignarla Say, but quite 

 distinct ; the wings of the two specimens before me are purely hyaline. 



12. 0. densa, u. sp. 



Female. — Head subtransverse, slightly wider than the thorax, dark 

 green, slightly tinged with blue about the clypeus, densely and finely 

 punctured, the punctures rather finer on the clypeus ; the latter some- 

 what prominent, densely clothed with short black pubescence, with the 

 anterior margin depressed, truncate, black, smooth and shining ; vertex 

 clothed with rather long fuscous pubescence, slightly mixed with ochra- 

 ceous ; mandibles stout, deeply channelled along the outer margin and 

 armed with three short blunt teeth, the innermost one bifid ; antennae 

 rather longer than the head, black. Thorax dark opaque-blue anteri- 

 orly, dark green with blue refiections posteriorly, very densely, conflu- 

 eutly and rather strongly punctured, anteriorly the punctures are so 

 dense and confluent as to appear granulate, on the scutellum and meta- 

 thorax the punctures are finer ; clothed with rather long ochraceous 

 pubescence ; disk of the thorax in front with a finely impressed longi- 

 tudinal line, and on each side above the tegulte a minute, smooth, shin- 

 ing spot ; tegulas blackish-piceous, slightly tinged with green, sparsely 

 punctured, shining. Wings subhyaline, apical margin slightly clouded, 

 nervures black. Legs black, shining, profoundly punctured, clothed 

 with short black pubescence. Abdomen subglobose, densely and rather 

 strongly punctured, dark green, shining, apical margins of the segments 

 steel-blue, smooth and subdepressed ; the basal segment above thinly 

 clothed with ochraceous pubescence, that on the apical segment some- 

 what fuscous ; beneath, the ventral scopa is dense and black. Length 

 4^ lines. 



Hah.—V\\ie^ Peak, Colorado Territory. Coll. Entom. Soc. Philad. 



