272 



ANGUIDJ!:. 



8. Gerrhonotus iml)ricatus. 



Barissia imbricata, Gray, Cat. p. 5o. 



lichenigerus, Gra;/, I. c. 



Gerrlionotus imbricatus, Wiegm. Isis, 1828, p. 381, and Herp. 3Iex. 



p. 34:, pi. X. figs. 2, 5 ; Dum. Sj- Bihr. v. p. 407 ; G'unth. Biol. C.-Am., 



Rept. p. 38. 

 lichenigerus, Tfagl. Icon. Amph. pi. xxxiv. fig. 2 ; Wiegm. 



Herp. Mex. p. 35, pi. x. fig. 6 ; Bum. ^_ Bibr. v. p. 408. 

 Barissia iinbricata, Gray, Ann. N. H. i. 18-38, p. 390, and Zool. 



Beechey''s Voy., Rept. p. 96, pi. xxxi. fig. 1. 

 Gerrhonotus (Barissia) imbricatus, Bocourt, 3Iiss. Sc. Mex., Rept. 



p. 363, pi. xxi. B. figs. 1, 2. 



Head-shields swollen ; three pairs of shields between the frontal 

 anrl the rostral ; nasal separated from the rostral ; a snpranasal ; a 

 postnasal ; a loreal ; two outer supraoculars ; ten or eleven upper 

 labials. Sides of neck covered with granular scales. Lateral 

 fold strong, extending to the neck. Nuchal scales in eight or ten 

 longitudinal series. Dorsal scales large, subrhomboidal, in twelve 

 or fourteen longitudinal series, the four to eight median strongly- 

 keeled, the others obtusely keeled or smooth ; thirty-five to forty 

 transverse series ; veutrals smaller than dorsals, in ten or twelve 

 longitudinal series. The adpressed fore limb usually reaches the 

 anterior corner of the eye ; the hind limb measures two thirds to 

 half the distance from axil to groin. Tail not twice as long as head 

 and body, compressed at the base ; upper caudal scales strongly- 

 keeled. OHve-browu above, uniform or with dark brown or greenish- 

 white spots or dots sometimes forming longitudinal bands ; head 

 frequently punctulated with whitish ; lower surfaces greenish or 

 yellowish white. 



millim. millim. 



Total length 265 Fore limb 28 



Head 28 Hind limb 35 



Width of head .... 19 Tail 160 



Body 77 



Mexico. 



a-c. (5 2 • Citv of Mexico. Mr. Doorman [C.]. 



d-f. cS & ligr. Mexico. M. Salle [C.]. 



g. (S . Mexico. Mr. Geale [C.]. 



h. c?. Mexico. Dr. J. E.Gray [P.]. 



i. 2 - Tehuantepec. 



k. d. ? 



9. Gerrlionotus rudicollis. 



Barissia rudicollis, Gray, Cat. p. 55. 

 Gerrhonotus rudicollis, Wiegm. Isis, 1828, p. 380, and Herp. Mex. 



p. 33, pi. X. fig. 1 ; Dum. 8,- Bihr. v. p. 410. 

 Barissia rudicollis, Gray, Ann. N. H. i. 1838, p. 390. 

 Gerrhonotus (Barissia) rudicollis, Bocourt, Miss. Sc. Mex., Rept. 



p. 367, pi. xxi. B. fig. 3. 



Closely allied to the preceding. Head larger ; nasal in contact 

 with the rostral ; nuchal shields more strongly keeled. Only 



