4G GEO. II. HORN. M. D. 



C. ebenus, Say, {Ateuchus ebenus) Journ. Acad. Ill, 208. 



Willi a clypeus as in pruhus this species has a very opaque surface 

 rather densely covered with coarse granules. The striae of the elytra 

 are barely distinct on the disc and quite deep toward the sides. Length 

 .30— .42 inch; 7.5—11 mm. 



Texas, Kansas and Tamaulipas. 

 C. depressipennis, Lee. Col. Kansas, p. 10. 



Similar to the preceding, but very much less coarsely granulate and 

 opaque. Striae of elytra similar to each other. Length .32 — .36 inch; 

 8—9 mm. 



Georgia. 

 C. perplexus. Lee. Journ. Aead. Ser. II, voL I, p. 85. 



Easily known by its small size, brown bronzed, shining surface, 

 coarsely j^uuctured thorax, each puncture of the thorax and elytra 

 bearing a small, recumbent, scale-like hair. Clypeus l-dentate. Hind 

 tibiae slightly arcuate. Length .18 — .20 inch; 5 — 5.5 mm. 



Texas. 



C. simplex, Lee. Pacif. E. E. Eep. App. I, p. 41 ; corvinus Harold, Berl. Ent. 

 Zeitschrift, 1SG8, p. 129. 



Easily recognizable by the characters given in the table. I cannot 

 agree with Harold in separating corvinus as distinct. Several distinct 

 varieties may be noted, however; 



simplex. — Surface entirely opaque, thorax not punctured. — Oregon. 



co?'y»«ws.— Surface entirely opaque, thorax punctured. — California and Ari- 

 zona. 



miVi^ari.s.— Surface ojiaque, thorax less punctured, humeri red, — Cal. (Tejou 

 and Visalia.) 



humeralis. — Surface less opaque, thorax less punctured and shining ; humeri 

 polished. — California (Coast Mts. South). 



The transition from those with impunctured thorax and those in 

 which it is so punctured, is so gradual as not to be at all defined. 

 The slight transverse plication of the elytra behind the humeri is an 

 individual character, some have it and many more are without it. 



Harold appears to have known but one specimen of sim2)Ir.c. My 

 own series is large, and my observation in California leads me to con- 

 sider all these forms as mere local varieties and not distinct species. 

 Length .23— .38 inch; 6—9.5 mm. 



Oregon, California and Arizona. 

 C. lecontei, Harold, Berl. Zeitsch. 1868, p. 68. 



Remarkably like probiis but differs in ha,ving the humeral stria ca- 

 rinate at base. The hinder tooth of the clypeus is obtuse, and the 

 notch between it and the next one very slight. The head and thorax 



