CHECKLIST OF REPTILES OF MEXICO 193 



Genotype. — Trachyderma horridum Wiegmann, 



Range. — Southern Utah to the Isthmus of Tehuantepec. 



Species. — Two. 



KEY TO SPECIES OF HELODERMA 



1. Tail equal to or longer than body; head and neck about half of body length; 

 predominating color black ; pterygopalatine teeth present. -horridum (p. 193) 

 Tail about two-thirds of body length; head and neck about one-third of body 

 length; colors pink, yellowish, and black; none or rarely 1 or 2 pterygo- 

 palatine teeth suspectum (p. 193) 



HELODERMA SUSPECTUM Cope 



Heloderma suspectum Cope, Proc. Acad. Nat. Sci. Philadelphia, 1869, pp. 5-6; 

 Ann. Rep. U. S. Nat. Mus., 1898 (1900), pp. 47&-483, fig. 87.— Smith, 

 Handbook of lizards, 1946, pp. 472-475, pi. 134. 



Type. — U.S.N.M. No. 2971, three cotypes; Major Emory collector. 



Type locality. — Sierra de la Union, "Sonora"(= Arizona). 



Range. — Sonora as far south as Guaymas; in the United States, 

 Arizona, southern Nevada, and southwestern Utah. Recorded from 

 Sonora: Guadelupe Canon, San Pedro Bay, La Posa about 10 miles 

 northwest of Guaymas, Monument 88, San Bernardino, Niggerhead 

 Mountain, 10 miles south of Noria, etc. 



HELODERMA HORRIDUM (Wiegmann) 



Trachyderma horridum Wiegmann, Isis von Oken, vol. 22, 1829, p. 421. 

 Heloderma horridum, Wiegmann, Isis von Oken, vol.22, 1829, p. 628; Herpeto- 



logia Mexicana, pt. 1, 1834, pp. 24-25, pi. 1. — Gtjnther, Biologia Centrali- 



Americana, Reptilia and Batrachia, 1885, pp. 43-44, pi. 26. — Smith, Univ. 



Kansas Sci. Bull., vol. 22, 1935, pp. 145-146. 

 Heloderma Hernandesvi Wiegmann, Herpetologia Mexicana, pt. 1, 1834, p. 25 



(for a theoretical form). 



Type. — Zool. Mus. Berlin; Ferdinand Deppe collector. 



Type locality. — "Vivit in ferventibus terrae Mexicanae regionibus," 

 here restricted to Huajintlan, Guerrero. 



Range.- — Coastal areas from Oaxaca to Sonora, extending up 

 the Rio Balsas Valley to Morelos.^^ Recorded from Sonora: 

 Alamos, Guirocoba; Sinaloa: Presidio near Mazatlan, San Bias; 

 Jalisco: Autlan, Barranca de San Crist6bal; Morelos: Canon del 

 Lobo near Cuernavaca; Oaxaca: Tapanatepec, Salina Cruz, Jimiltepec, 

 Juchitan, Tehuantepec, Quiengola and Mixtequilla Mountains; 

 Michoacdn: Apatzingan, Parecuaro, Oropeo, Etucuaro, Puruaran; 

 Colima: Paso del Rio, Colima; C^errgro; Huajintlan; CAiapos ; Rancho 

 San Bartolo. 



»« A sight record for Zongolica, Veracruz (Martin del Campo, Anal. Inst. Biologfa, vol. 6, 1935, p. 297) 

 is unacceptable and may be referable to Xenosawus. Likevrise unacceptable are records for Guanajuato 

 and Yucatto. We are unable to find authoritative records for Nayarit, although Martin del Campo 

 (loc. cit.) cites the state. 



