1. GEBRHONOTUS. 275 



Gerrhonotiis kingii, O'SIiaur/Iin. Ann. Sj- Macf. N. H. (4) xii. 1873, 

 p. 4G ; Bocoxrt, Miss. .S'c. 'Mex., Rept. p. 33!), pi. xxi. c. fig-. 2. 



Head-shields smooth ; three largo prjxifroiitals, the anterior broader 

 than long and normally separated from the frontal by the posterior 

 pair ; two pairs of small shields between the rostral and the odd 

 pnefroutal ; nasal in contact with the rostral ; two superposed post- 

 nasals and two loreals ; five large inner and two or three small outer 

 supraoculars ; ten upper labials. Sides of neck granular. Lateral 

 fold very strong, beginning on the neck. Nuchal shields smooth, in 

 ten or twelve longitudinal series. Dorsal scales in fourteen or 

 sixteen longitudinal series, those of the median sei'ies obtusely 

 keeled, the laterals smooth ; in size nearly equalling tlie ventrals ; 

 fifty to fifty-three transverse series. Ventrals in twelve longi- 

 tudinal series. Limbs and tail as in G. ccendeus. Brownish above, 

 with dark brown cross bands. 



From snout to vent 110 millim. ; tail 280 millim. 



Mexico ; Xew Mexico. 



Dr. Giinther regards this as one of the variations of 0. ccendens 

 (Z. c. p. 39). 



a. Ad., bad state. Mexico. T. Bell, Esq. [P.]. (Type.) 



b. Yg. Deming, New JNIexico. ]Mr. Ferrer [C]. 



13. Gerrhonotus lioceplialiis. 



Gerrhouotiis tessellatus, Grai/, Cat. p. o-'5. 

 Gerrhonotus liocepbalus, Wieiim. Isis, 1828, p. 381 ; Bocourt, Miss. 



Sc. Mex., Rept. p. 342, pi. xxi. a. figs. 1, 2 ; Ginith. Biol. C.-Am., 



Rcpt. p. 41. 

 Scincus ventralis, Peale Sf Green, Jotirn. Ac. Philad. vi. 1830, p. 233. 

 Gerrhonotus tessellatus, Wiegm, Herp. Mex. p. 32, pi. x. fig. 3 ; 



Dwn. 8)- Bib,: v. p. 405. 

 ? GenliODotus iiifernalis, Baird, Proc. Ac. Philad. 1858, p. 255. 

 Gerrbouotus ophiurus, Cope, Proc. Ac. Philad. 1866. p. 321. 



lemniscatus, Bocourt, Nouv. Arch. Mas. vii. 1872, Bull. p. 105. 



Pterogasterus veutrahs, Cojye, Proc. Am. Philos. Soc. xvii. 1877, 



p. 96. 



tessellatus, Cope, I. c. 



ophiurus, Cope, l. c. 



inferualis, Cope, 1. c. 



lemniscatus, Cope, I. c. 



Head-shields smooth ; three large praefrontals, forming a triangle ; 

 three pairs of small shields between the latter and the rostral, the 

 two front pairs usually separated by a small azygos shield ; nasal 

 separated from the rostral ; two superposed postnasals ; two or 

 three loreals, the posterior sometimes fusing with the canthal ; three 

 outer sui)raoculars ; ten to thirteen upper labials. Sides of neck 

 with granular scales. Lateral fold very strong, extending on the 

 neck. Dorsal scales in fourteen or sixteen longitudinal series, the 

 eight or ten median series strongly keeled, the others smooth ; 

 forty-nine to fifty -five transverse series. Ventrals nearly as largo 

 as dorsals, in twelve longitudinal scries. Limbs very variable in 

 length. Tail a little compressed at the base, once and two thirds to 



t2 



