CHECKLIST OF REPTILES OF MEXICO 105 



Type locality. — State of Sonora, not far from the boundary of 

 Arizona. 



Range. — Known only from the type locality. 



Genus SCELOPORUS Wiegmann 



Sceloporus Wiegmann, Isis von Oken, 1828, p. 369. 



Tropidolepis Cuvier, Rfigne animal . . . , ed. 1, vol. 2, 1817, p. 38 (type, Agama 



undulata Daudin). 

 Lysoptychus Cope, Proc. U. S. Nat. Mus., vol. 11, 1888, pp. 397-398 (type, L. 



lateralis Cope = Sceloporus couchii Baird). 



Genotype. — Sceloporus torquatus Wiegmann. 



Species.— In all, 104 forms are recognized at present, consisting of 

 54 species representing 15 groups. Eighty-nine forms of 52 species 

 are known from Mexico. 



Range.— Southern Canada on the west and southern New "York on 

 the east south throughout North and Central America to western 

 Panama. 



KEY TO MEXICAN GROUPS OF SCELOPORUS 



1. Postfemoral dermal pocket present 2 



Postfemoral dermal pocket absent 4 



2. Postrostral scales absent; nasals and internasals in contact with rostral. 



maculosus (p. 133) 

 Postrostral scales present; internasals and nasals separated from rostral. _ 3 



3. Tail strongly compressed in males, rounded and light pink in females; femoral 



pores 24 or more on each side pyrocephalus (p. 138) 



Tail rounded in both sexes, not pink in females; femoral pores 20 or less. 



variabilis (p. 129) 



4. Lateral body scales not imbricate 5 



Lateral body scales imbricate 6 



5. Preanal scales keeled in females; males with poorly developed postanals; no 



distinct belly patches in males; tail over twice length of body. 



utiformis (p. 135) 

 Preanal scales smooth in females; males with well-developed postanals; 

 lateral belly patches distinct in males; tail less than twice length of body. 



merriami (p. 132) 



6. No postrostrals; nasals and internasals in contact with rostral 7 



Postrostrals present; nasal and internasals separated from rostral 8 



7. Dorsal scales 50 or more; femoral pores 17 or more; preanals smooth in 



females scalaris (p. 136) 



Dorsal scales 46 or less; femoral pores 16 or less; preanals keeled in females. 



siniferus (p. 133) 



8. Ventral scales, at least laterally, pointed, not notched; preanal scales keeled 



in females; no lateral belly markings in males; femoral pore series widely 



separated medially; two postrostrals siniferus (p. 133) 



Ventral scales notched, or, if pointed, femoral pore series closely approxi- 

 mated medially (separated by four scales or less); preanal scales smooth 

 in females 9 



9. Males uniform white below; anterior section of frontal longitudinally divided; 



femoral pore series widely separated medially chrysostictus (p. 133) 



Males with lateral belly patches distinct or, if not, anterior section of frontal 

 entire 10 



