514 REPORT OF NATIONAL MUSEUM, 1898. 



GERRHONOTUS T^ENIATUS Wiegmann. 



Gerrhonotus tamiatus Wiegmann, Isis, 1828, p. 379; Herpet. Mexico, 1834, p. 32, 

 pi. IX, fig. 1.— DuMERiL and Bujkon, Erp. G^n., V, 1839, p. 399. — O'Shaugii- 

 NESSY, Auu. and Mag. Nat. Hist., 1873, p. 45. — Cope, Proc. Amer. Phil. Soc, 

 1877, p. 96.— Boulenger, Cat. Liz. Brit. Mus., II, 1885, p. 270. 



Abronia Ueiiiatns Gray, Cat. Spec. Liz. Coll. Brit. Mus., 1845, p. 53. 



Gerrlwnoius (Abronia) tamiatus BocouRT, Miss. Sci. Mex. Ropt., 1878, p. 327, pi. 

 XXI, A, ligs. 4, 5. 



Head flat on top; wide behind and covered in the temporal regions 

 with convex scales. Nasal scute separated from the rostral. Upper 

 edge of the tympanum bordered with granular scales. One pair of 

 prefrontonasal plates, a pair of internasals, and a supranasal. Eleven 

 or twelve pairs of supralabials. Mental divided. Dorsal scales show- 

 ing a slight longitudinal swelling, and larger than the ventral plates. 

 Lateral fold small. Tail of medium length. Color greenish gray, with 

 transverse bands of dark green. 



Head rounded in the temporal region and covered with finely rugose 

 scales; length to the middle of the auricular opening equal to eight 

 dorsal scales, and entering four times and a half into the space from 

 the chin to the anus. Muzzle covered with seven scales; the two inter- 

 nasals in contact with each other and anteriorly with the rostral and 

 on each side with the first supralabial. The prefrontonasal is larger 

 and is hexagonal. The interfrontonasal is eijually large, and is hex- 

 agonal and in contact T^ith six plates; in front with the prefrontonasals, 

 behind with the two prefrontals, and on each side with the upper loreal 

 jdate, which in this species is recurved on the upper border of the 

 muzzle. The supranasal is rectangular in outline, and is placed to the 

 right and left above the nasal scute; the prefrontals are irregularly 

 hexagonal, and each of them articulates behind with the frontal; the 

 latter is relatively short, is obtuse-angled in front and sharply so at 

 the back, with the point truncate and in contact with a narrow lozenge- 

 shaped interparietal. The latter is in contact with six scutes; in front 

 with the preceding and with two frontoparietals, on each side with a 

 large parietal, and behind with the occipital. The occipital is in con- 

 tact, right and left, with a postparietal scale, and is followed by two 

 ranks of nuchal scales. There are five supraocular plates, which 

 embrace three or four smaller scales between themselves and the sui)er- 

 ciliaries. The temples are prominent and are covered with convex 

 scales. Nostril opening pierced at the jjosterior part of the nasal 

 plate; the latter in contact anteriorly with the first labial plate and 

 wi;h the internasal; above with a small supranasal, below with the 

 second supralabial, and behind with two small superposed nasoloreals. 

 These latter are in front of one loreal or two superposed, of which the 

 toi) one is the smaller and is recurved on the upper face of the muz- 

 zle; the freno-ocular is large and irregularly hexagonal; the lower 

 side, rather narrow, rests on the fifth supralabial; the subquadrilateral 



