166' FREDERICK BANCHARD. 



Var. humeralis Horn, 1. c. — Surface less opaque, thorax less punctured and 

 shining, humeri polished. 

 Cal. 

 Length 6—9 mm. Yellowstone Lake, Idaho, Vane, Sonera. 



9. C cyaiiellus Lee, Col. Kans. 1859. p. 11 ; Horn. 1. c. p. 45; C. speciosus 

 Harold, 1. c. p. 41. 



Outer edge of subhumeral stria finely carinate ; no denticle on the 

 lower margin of prothorax. Length 7-9.5 mm. Texas. (Mex. Harold) 



10. C. vigilans Lee. Jour. Acad. 1868, ser. 2, IV, p. Ifi; Col. Kans. 1859, p. 

 10 ; Harold, I. c. p. 100 , Horn, 1. c. p. 47. 



In this and the next three species the hind tibife appear slightly 

 twisted, the plane of the upper surface being deflexed outward toward 

 the apex. Length 17-22 mm. Mich., Penn., Ga. to Kans., Texas, Col. 



11. C laevis Drury (Scarabaeus), Exot. In.'*. 1770. I, p. 79, pi. 35, fig. 7; ed. 

 Westwood, 18.'57, I, p. 73, pi. 35, fig. 7; Oliv., Ent. 1789, I, p. IfiO, pi. 10, fig. 89; 

 Lee. ( Canthon), Col. Kans. 1859, p. 10; Harold, 1. c, p. 99; Horn, 1. c. p. 47 : Sc. 

 pilulariuH De Geer, Mem. Ins. 1774, IV, p. 311, pi. 18, fig. 14; Sc. hudsonins Forst., 

 Cent. Ins. 1781 ; Ateuchus volvens Fabr., Syst. El. 1801, I, p. 60 ; Lap. (Canthon), 

 Hist. Nat. II, p. 68; Candeze, Mem. Soc. Liege 1861, XVI, p. .345, pi. 2, fig. 2 

 (larva) ; C. obtusidens Zieg., Proc. Acad. 1844, II, p. 45 ; var. viridesctns Horn 1, c. 

 p. 47. 



Northern and eastern specimens are usually black with a dull coppery 

 tinge. South and west occur black, deep blue and dull and bright green 

 varieties. The spur of the anterior tibia? of the male in this species and 

 in the last is rather more excurved than usual, the sides nearly parallel, 

 the outer angle acute and longer than the inner which is also acute. 

 Length 1(1-19 mm. N. Eng. to S. Cal. 



12. C Chalcites Hald., Proc. Acad. 1843, I, p. 3il4 : Lee, Col. Kans. 1859, p. 

 10 : Horn 1. c. p. 47. 



The surface of the thorax is finely scabrous and without distinct 

 granules. The spur of the front tibiae of the male is broad at apex, 

 moderately emarginate, the outer angle acute, scarcely longer than the 

 inner which is broad and rounded. In the male the front tibiae are much 

 longer and more arcuate, and the middle tibiae distinctly longer than in 

 the female. Length 13-20 mm. N. C, Ga., Kans., Texas, N. 111., 

 Mo., Neb., La., Ind. Terr. 



13. C. indigaceiis Lee, Proc. Acad. 1866, p. 280; Horn 1. e p. 45. 



Owing to the very bad condition of the type, by an error in observa- 

 tion, the hind tibiae have been said by Dr. Horn to have two spurs. 

 Reference to the type and the examination of many other specimens 

 show that there is never in reality but a single spur. The pygidium of 

 the male is concave before and very strongly convex at posterior two- 



