120 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 

 RHADINELLA SCHISTOSA Smith 



Rhadinella scMstosa Smith, Copeia, 1941, No. 1, pp. 7-10, fig. 1 (head and neck 

 only) ; Proc. U. S. Nat. Mus., vol. 93, 1943, pp. 465-466. 



Type.—E. H. Taylor-H. M. Smith Coll. No. 23580. 



Type locality. — Cuaiitlapan, Veracruz. 



Range. — Central Veracruz ; known only from the type locality. 



Genus RHINOCHEILUS Baird and Girard 



Rhinocheilus Baied and Girakd, Catalogue of North American reptiles, 1853, pp. 

 120-121.— Klaubee, Trans. San Diego Soc. Nat. Hist., vol. 9, 1941, pp. 289- 

 380, pis. 12-13, map (generic revision). 



Genotype. — Rhinocheiliis lecontei Baird and Girard. 



Range. — Southwestern Idaho to northern Baja California, east 

 through central Texas and western Kansas, south to southern Coahuila 

 and Chihuahua, and along the Pacific coast to Jalisco. 



Species. — Four subspecies are known, all occurring in Mexico. 



KEY TO FORMS OF RHINOCHEILUS "^ 



1. Dorsal blotches on body usually 17 or less ; longitudinal extent of blotches 



(at midbody) 3 or more times the interspaces antonii antonii 



Dorsal blotches on body usually more than 17; longitudinal extent of 

 dorsal blotches at midbody less than 3 times the interspaces 2 



2. Snout sharper and with a distinct upward tilt toward point ; rostral raised 



appreciably above nasals and internasals lecontei tessellatus 



Snout blunter and without a distinct upward tilt toward point; rostral 

 raised only slightly or not at all above nasals and internasals 3 



3. Black dorsal blotches on body usually 25 or more ; lateral areas between 



primary dai'k blotches heavily mottled or spotted with black (may be 

 faint in juveniles) ; red usually present in interspaces; ground color 



cream lecontei lecontei 



Black dorsal blotches on body usually less than 25 ; lateral areas between 

 primary dark blotches immaculate, faintly punctated, or marked with a 

 single series of secondary spots at the edges of ventrals ; red usually 

 absent in interspaces ; ground color white antonii clarus 



RHINOCHEILUS ANTONII ANTONII Duges 



Rhinocheilus antonii Duces, Proc. Amer. Philos. Soc, vol. 23, 1886, pp. 290-291, 



figs. 1-5. 

 Rhinocheilus lecontei antonii Klaubeb, Trans. San Diego Soc. Nat. Hist., vol. 9, 



1941, pp. 314-318, map p. 330. 

 Rhinocheilus antonii antonii Smith, Amer. Midi. Nat., vol. 28, 1942, pp. 201-203. 



Type. — Mus. Alfredo Duges, Univ. Guanajuato, Mexico. 

 Type locality. — San Bias, Nayarit. 



Range. — Pacific coast, Jalisco northward to northern Sonora 

 (recorded from the states of Jalisco, Nayarit, Sinaloa, and Sonora). 



«» From Klauber, op. cit., p. 326. 



