AMERICAN COLEOPTERA. 47 



are ileiiscly and finely granulate, almost rugose. Length .25 inch ; 

 6. mm. 

 Texas. 



C. viridis, Beauv. ( Copr is) Ins. AC ct. Amnr. p. 2:1, pi. .3, fig. 2; viridlcalus, 

 Sav, {Onthophagus), Bost. Journ. I, 175 ; obsoletus, Say, {Ateuchua), Journ, Acad. 

 Ill, p. 208. 



Easily known by its small size, bidentate clypens, and sliglitly arcu- 

 ate hind tibicB. Surface shining, very finely punctured, and green or 

 bronze in color, the latter being the ohsolefns, Say. Length .10 — .20 

 inch J 4 — 5 mm. The smallest species of the genus. 



Southern and Western States, also iu Central America. 

 C. vigilans, Lee. Journ. Acad. Ser. II, vol. IV., 1S38, p. Ifi. 



Oar largest species. Easily distinguishable from the two f illowing 

 by the larger eyes. Surface granulate and opa(|ue. Length .Gi — .S-t 

 inch; 17 — 22 mm. 



Pennsylvania, Delaware, Missouri, Kansas and Texas. 



C. laevis. Drury, {Scarabreus), Exot. Ins. I, p. 79, pi. .'>.), fig. 7; Oliv. Ent. 1, .3, 

 p. Kii), pi. II), fig, 8<J; pilularius, DeGeer Mem. Ins. IV., p. 311, pi. 18, fig. 14, 

 volven-i, F ah., (Ateuckus) Sy St. El. 1,60; voluens, Ca,st. [Canthon) Hist. Nat. II, 

 68; obtusidens, Zeig. Proc. Acad. II, 45. 



This species is entirely too well known to need comment. Several 

 varieties, all having the thorax and elytra distinctly granulate may be 

 noted. 



Obtusidens, Zeig., in which the teeth of the clypeus are barely distinct. 

 These are usually old specimens and have the teeth of the anterior tibifie also 

 obtuse. 



Viridcscens, Lee, (Coll.) — Surface bright green. The clypeus normally 

 dentate. 



The more general color is a dull black with a tinge of copper. 

 Length .40 — .75 inch ; 10 — 19 mm. 



Widely diffused over the entire region cast of the Rocky Mts., west- 

 ward into Arizona, and south througli Northern Mexico. 

 C. chalcites, IlaUl. Proc. Acad. 1, 304. 



I cannot agree with Harold in uniting this with the preceding. 

 The elytral sculpture is similar, but the granules are more sparsely 

 placed. The thorax is finely and intricately rugose and not granulate 

 as iu Isevis. I have seen specimens of the latter in which the thorax 

 was quite smooth, yet very evident traces of the granules remain in 

 smooth round spaces between which are the finer granules, visible 

 even in strongly granulate specimens only under high power. The 

 form of chalcites is more robust, being shorter and broader than Isevis. 

 Length .50 — 70 inch ; 13 — 19 mm. 

 Missouri and Kansas. 



