OPHISAURUS.—GERRHONOTUS. , 30 
OPHISAURUS. 
Ophisaurus, Daudin, Hist. Rept. vii. p. 346. 
1. Ophisaurus ventralis. 
Glass-Snake, Catesby, Carol. ii. t. 59. 
Anguis ventralis, Linn. Syst. Nat. 12 ed.i. p. 391. 
Ophisaurus ventralis, Daud. 1. c. p. 352, t. 61. figg. 40, 41, & t.88; Dum. & Bibr. Erp. Gén. v. 
p. 425; Holbrook, N. Amer. Herpet. ii. p. 189; Yarrow, Bull. U.S. Nat. Mus. no. 24, 
p. 46. 
Hab. Nortu America, Southern States—Mexico, Jalapa (U. S. Nat. Mus.). 
GERRHONOTUS. 
Gerrhonotus, Wiegmann, Herpet. Mex. p. 29. 
Abronia, Gerrhonotus, Elgaria, Barisia, Gray, Ann. Nat. Hist. 1838, i. pp. 889, 390. 
Pterogasterus (Peale & Green), Gerrhonotus, Mesaspis, Barissia, Cope, Proc. Am. Phil. Soc. 1878, 
Xvli. pp. 96, 97. 
This genus is a truly Central-American, or rather Mexican, type, two only out of 
seventeen species occurring beyond the northern boundary of Mexico, and only one of 
them being more widely and generally spread north than south of that boundary. I have 
therefore appended short diagnoses to all the species, except the two following, about 
the relations of which to the other species I have not been able to form an opinion :— 
Gerrhonotus webbii, Baird, Proc. Ac. N. Sc. Phil. 1858, p. 255; and U.S, and 
Mex. Bound. Exped., Rept. p. 11, t. 24. figg. 1-10.— Had. San Diego. 
Gerrhonotus fulvus, Cope, Journ. Ac. N. Sc. Phil. 1865, p. 118. (not Bocourt), 
= Gerrhonotus monticolus, Cope, Proc. Am. Phil. Soc. 1877, p. 97.—Hab. Eastern 
Cordillera of Costa Rica (11,500 feet). 
The majority of the species are inhabitants of the mountainous or alpine districts, 
where they live in oak- and pine-forests, at an altitude varying from 6000 to 12,000 
feet, under decaying trunks, or among the large floating tufts of Zillandsia usneoides. 
When caught they bite most furiously (Sumechrast). 
1. Gerrhonotus deppii. 
Gerrhonotus deppiit, Wiegm. Herpet. Mex. p. 31, t. 9. fig. 2; Dum. & Bibr. Exp. Gén. v. 398; 
Bocourt, Miss. Sc. Mex., Rept. p. 325, t. 21a. figg. 3. 
Abronia deppii, Gray, Cat. Liz. p. 53. 
Hab. Mexico (Wiegmann). 
Dorsal scales smooth, in ten or eleven longitudinal series. Nasal shield not in 
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