74 HETEROMERA. 
the elytra less convex, broader at the base and less rounded at the sides, and with rows 
of shallow punctures towards the base. 
CENTRIOPTERA. 
Centrioptera, Mann. Bull. Mosc. ii. 1848, p. 279; id. Mag. de Zool., 1843, Ins. t. 126; Lac. Gen. 
Col. v. p. 186; Horn, Rev. Ten. N. A. p. 278; Lec. & Horn, Class. Col. N. A, p. 368. 
Oochila, Lec. Class. Col. N. A. p. 220. 
Asbolus, Lec. (part). 
Seven species are known of this North-American genus; one is also found in Mexico, 
and another just on our northern boundary; the remainder are peculiar to Texas, 
Lower California, and Arizona. 
1. Centrioptera caraboides. | 
Centrioptera caraboides, Maun. loc. cit. p. 280°; id. Mag. Zool. loc. cit.; Horn, Rev. Ten. N. A. 
p. 280. 
Hab. Norta America, California!.—Mexico, Puebla (Sallé). 
An example in the Sallé collection agrees very well with Mannerheim’s description 
and figure. C. spiculifera, if the specimens in Mr. F. Bates’s collection are correctly 
named, is not identical with this species. 
2. Centrioptera muricata. 
Centrioptera muricata, Lec. Ann. Lyc. New York, v. p. 142’; Horn, Rev. Ten. N. A. p. 279°. 
Hab. Norra America, deserts of the Colorado! ? and Gila rivers 2. 
Group CONIONTIDES. 
This group is represented, as yet, by one genus (Eusattus) only in Central America. 
Allied genera are found in North America—Coniontis in California and Oregon, Celus 
on the coast of California, and Celotasxis peculiar to Guadalupe Island west of the 
peninsula of Lower California. 
EUSATTUS. 
Eusatius, Leconte, Ann. Lyc. New York, v. p. 131 (1852) ; Horn, Rev. Ten. N. Am. p. 292; Lec. 
& Horn, Class. Col. N. A. p. 371. 
Discodemus, Lec. Class. Col. N. A. p. 228. 
Conipinus, Lec. loc. cit. p. 223. 
A North-American genus, found in Kansas, Arizona, California, Oregon, Colorado, 
New Mexico, &c., and extending also into Mexico. Four species only are known as 
