CHECKLIST OF REPTILES OF MEXICO 203 



Genus GERRHONOTUS Wiegmann 



Gerrhonotus Wiegmann, Isis von Oken, vol. 21, 1828, No. 3, p. 379. — Tihen, 



Amer. Midi. Nat., vol. 41, 1949, pp. 591-593. 

 Pterogasienes Peale and Green, Journ. Acad. Nat. Sci. Philadelphia, vol. 6, 



1830, p. 234 (type, Scincus ventralis Peale and Green). 



Genotype. — Gerrhonotus tessellatus Wiegmann [=Gerrhonotus lioce- 

 phalus Wiegmann]. 



Range. — Central Texas southward through the plateaux of Mexico 

 to southwestern Chiapas. 



Species. — One. Five forms recognized, all occurring in Mexico. 



KEY TO SPECIES OF GERRHONOTUS 



1 . Three loreals (loreocanthals) on each side 2 



Four or more loreocanthals on each side 3 



2. Supranasals absent; azygous prefrontal much longer than broad; frontal 



widely separated from interparietal; all except lowermost anterior temporal 



touch fifth medial supraocular liocephalus austrinus (p. 204) 



Supranasals present; azygous prefrontal as broad as or broader than long; 

 frontal in contact with or very narrowly separated from interparietal; onlj' 

 2 uppermost anterior temporals in contact with fifth supraocular. 



liocephalus liocephalus (p. 203) 



3. Dorsal bands obsolete; venter nearly without marking; 52-60 dorsal scales 



(average 55. 6) ; tail to body ratio, 2. 5-2. 6; caudals 157-163; second primary 

 temporal touches the fifth medial supraocular. 



liocephalus loweryi (p. 204) 

 Dorsal bands distinct ; venter mottled and flecked 4 



4. Dorsal scales 45-54 (average 49); tail-body ratio, 1. 75-2. 1; caudals, 116-137. 



liocephalus infemalis (p. 204) 

 Dorsal scales 49-52 (average 51); tail-body ratio 2. 3; caudals (approx.) 140. 



liocephalus ophiurus (p. 204) 



GERRHONOTUS LIOCEPHALUS UOCEPHALUS Wiegmann 



G[errhonotus] liocephalus Wiegmann, Isis von Oken, vol. 21, 1828, p. 381. 

 Gerrhonotus liocephalus, Bocourt, Mission scientifique au Mexique . . . , Etudes 



sur les reptiles, livr. 5, 1878, pp. 342-346, pi. 21A, figs. 1, 2, 2a. 

 Gerrhonotus liocephalus liocephalus, Cope, Ann. Rep. U, S. Nat. Mus. 1898 (1900), 



pp. 516-517.— Smith, Proc. U. S. Nat. Mus., vol. 92, 1942, p. 369. 

 G[errhonotus] tessellatus Wiegmann, Herpetologia Mexicana, pt. 1, 1834, pp. 



32-33, pi. 10, fig. 3 (substitute name for preceding). 

 Scincus ventralis Peale and Green, Journ. Acad. Nat. Sci. Philadelphia, 1838, 



pt. 4, p. 233 (type locality, "Mining Districts of Mexico" = "Valley of Mexico" 



fide Cope, here restricted to Magdalena, D. F.; type in Acad. Nat. Sci. 



Philadelphia, two cotypes). 



Type. — Zool. AIus. Berlin; F. Deppe collector. 



Type locality. —Mexico (Oaxaca, fide Bocourt loc. cit., p. 344, here 

 restricted to Tlapancingo). 



Range. — Central plateau region, from Guanajuato to Guerrero and 

 Oaxaca. Reported from Distrito Federal: Magdalena, Mixiuhca; 

 Guerrero: Omilteme; Mexico: Temascaltepec; Oaxaca: Llano Ocotal, 



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