CHECKLIST OF THE SNAKES OF MEXICO 35 



Genus CHIONACTIS Cope 



Lamprosoma Haixoweiol, Proc. Acad. Nat. Sci. Philadelphia, vol. 8, 1856, p. 310 

 (genotype, Rhinostotmi occipitale Hallowell ; uame preoccupied by Lampro- 

 soma Kirby, 1819 [Coleoptera]). 



Chionactis Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 12, 1860, p. 241. — 

 Sttckel, Proc. Biol. Soc. Washington, vol. 56, 1943, pp. 127-128 (resurrection 

 and comparison with So^iora and Procinura). 



Genotype. — Rhinostoma occipitale Hallowell. 



Ra/r\ge. — Southern California except near coast, extreme southern 

 Nevada, and western Arizona. 



Species. — One species with four subspecies is recognized. Two 

 forms occur in Mexico. 



KEY TO MEXICAN FORMS OF CHIONACTIS 



1. Total number of dark bands on body and tail 22 or more_ occipitalis annulatus 

 Total number of dark bands on body and tail 21 or less- occipitalis palarostris 



♦CHIONACTIS OCCIPITALIS ANNULATUS (Baird) 



Lamprosoma anmdatum B.vird, Rep. U. S. Mex. Bound. Surv., vol. 2, 1859, 



Rept., p. 22, pi. 21, fig. 1. — Van Denbukgh, Occ. Pap. California Acad. Sci., 



vol. 10, 1922, pp. 859-862 (part), pi. 95, fig. 2. 

 Sonora occipitalis annulata Stickel, Bull. Chicago Acad. Sci., vol. 6, 1941, pp. 



136-137. 

 Chionactis occipitalis annulatus Stickbx, Proc. Biol. Soc. Washington, vol. 56, 



1943, p. 128. 



Type.—U. S. N. M. No. 2105. 



Type locality. — Colorado Desert. 



Range. — Southwestern Arizona, extreme southeastern California, 

 probably extreme northeastern Baja California, and probably extreme 

 northwestern Sonora. 



CHIONACTIS OCCIPITALIS PALAROSTRIS (Klanber) 



Sonora palarostris Klatjber, Trans. San Diego Soc. Nat. Hist., vol. 8, 1937, 



pp. 363-365. 

 Sonora occipitalis palarostris Stickel, Bull. Chicago Acad. Sci., vol. 6, 1941, 



pp. 137-138. 

 Chionactis occipitalis palarostris Stickel, Proc. Biol. Soc. Washington, vol. 56, 



1943, p. 128. 



Type.—L. M. Klauber Coll. (San Diego, Calif.) No. 26771. 

 Type locality. — Five miles south of Magdalena, Sonora. 

 Range. — Northern and central Sonora. 



Genus CLELIA Fitzinger '« 



Clelia FrrziNGEB, Neue Classification der Reptilien, 1826, p. 56. 

 Dubcrria Fitzinger, idem (type, Coluier plumbeus Wied). 



See footnote for Oxyrhopus, p. 103. 



