1873.] J-^7 [Horn. 



segment tubuliform and truncate. Hind trochanter with acute spine at 

 middle. 



Female. Fifth ventral sub-truncate, sixth with rounded notch. Hind 

 trochanter sub-angulate. Antenna? as in melana. 



Spurs of hind tibia? dissimilar, inner slender acute, outer broader 

 obliquely truncate and laminiform at tip. 



Occurs abundantly in Western Kansas and in Colorado. 



C, cyanipennis, Lee. Ann. Lye. V, p. 160; Proc. Acad. 1853, p. 333; 

 salicis, Lee. loc. cit. 



Head metallic green, shining, sparsely punctured. Thorax sub-pentago- 

 nal, sides obtusely prominent, disc uneven, sparsely punctured, color 

 metallic green. Elytra parallel, bluish or violet, finely scabrous. Body 

 beneath with bluish or greenish metallic lustre. Length .50-. 70 inch ; 

 13-18 mm. 



Male. Antenna? with intermediate joints moderately thickened. Fifth 

 ventral segment not deeply emarginate at middle, on each side broadly 

 rounded, sixth ventral elongate, deeply cleft. Last dorsal segment tubu- 

 liform truncate at apex. Hind trochanters with short spine at middle. 



Ft >it ale. Antenna? gradually thickened to tip. Fifth ventral truncate, 

 with semi-circular emargination. Hind trochanter neither armed with a 

 spine nor sub-angulate. 



Spurs of hind tibia? dissimilar, inner slender acute, outer somewhat 

 stouter, very obliquely truncate and laminate at tip. 



The variety salicis cannot be separated specifically, it differs by being 

 entirely blue or violet. A variety occurs in Oregon entirely green. 



Its distribution extends from Utah to Oregon. 



0. viridana, Lee. New Species, p. 162. 



Head metallic green, shining, sparsely punctured. Thorax scarcely 

 sub-pentagonal, surface uneven, color greenish metallic, shining with few 

 punctures. Elytra parallel, surface finely scabrous, varying in color from 

 green to violet. Body beneath bluish or violet with greenish reflection. 

 Length .60-. 70 inch ; 15-18 mm. 



Male. Joints 4-8 thicker, anterior face pilose with short hairs. Fifth 

 ventral segment broadly emarginate at middle, six prolonged and deeply 

 cleft. Last dorsal truncate. Hind trochanters mutic. 



Female. Antenna? as in cyanipennis. Fifth ventral segment truncate, 

 sixth semi-circularly emarginate. 



Spurs of hind tibia? as in cyanipennis. 



Resembles the preceding species but may be known by the male having 

 the hind trochanters simple, and intermediate joints of antenna? pilose. 

 Its distribution from the Platte Valley northward to Fort Edmonton. 



0. lugubris,* Ulke. Explorations in Nevada and Arizona Expedition 

 of 1871, Lieut. G. M. Wheeler, commanding. 



♦Through the kindness of Mr. H. Ulke, of Washington , I have been permitted to study this 

 species and also Epicauta XVheeleri, which are described by him in the forthcoming report of 

 Lieut. Wheeler. As no copy of the work has yet been received I am unable to quote the pages 

 on which they are described. 



