272 ANGUID. 
8. Gerrhonotus imbricatus. 
Barissia imbricata, Gray, Cat. p. 55. 
lichenigerus, Gray, 1. ¢. 
Gerrhonotus imbricatus, Wiegm. Isis, 1828, p. 381, and Herp. Mex. 
p. 34, pl. x. figs. 2,5; Dum. § Bibr.v.p. 407; Giinth. Biol. C-Am., 
Rept. p. 38. 
lichenigerus, Wagl. Icon. Amph. pl. xxxiv. fig. 2; Wiregm. 
Herp. Mex. p. 35, pl. x. fig. 6; Dum. & Bibr. v. p. 408. 
Barissia imbricata, tives, Ann. N. H. i. 1838, p. 390, and Zool. 
Beechey’s Voy., Rept. p. 96, pl. xxxi. fig. 1. 
Gerrhonotus (Barissia) imbricatus, Bocourt, Miss. Sc. Mex., Rept. 
p. 3638, pl. xxi. B. figs. 1, 2, 
Head-shields swollen ; three pairs of shields between the frontal 
and the rostral; nasal separated from the rostral; a supranasal; 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; ventrals 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. Olive-brown 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! saxo vusta ica 28 Hind limb........ 35 
Width of head .... 19 WAM os wee os eaiacs 160 
Body .........005 77 
Mexico 
a-c. SQ. City of Mexico. Mr. Doorman [C.]. 
d-f. 3 & her. Mexico. M. Sallé [0.]. 
g. 3. Mexico. Mr. Geale [C.]. 
A Mexico. Dr. J. E, Gray | P.]. 
t Tehuantepec. 
ko —! 
9. Gerrhonotus rudicollis. 
Barissia rudicollis, Gray, Cat. p. 55. 
Gerrhonotus rudicollis, Wiegm. Isis, 1828, p. 380, and Herp, Mex, 
p. 33, pl. x. fig. 1; Dum. & Babr. v. p. 410. 
Barissia rudicollis, Gray, Ann. N. H. i. 1838, p. 390. 
Gerrhonotus (Barissia) rudicollis, Bocourt, Miss. Sc. Mex., Rept. 
p. 867, pl. xxi. B. fig. 3. 
Closely allied to the preceding. Head larger; nasal in contact 
with the rostral; nuchal shields more strongly keeled. Only 
