516 



REPORT OF NATIONAL MUSEUM, 1898. 



Wiegmaiiii's type, but the iuterfroutouasal is entirely inclosed by the 

 prefrontonasals and prefrontals, as in the second specimen from the 

 Berlin collection described by Bocourt. There are ouly four preanals. 



GERRHONOTUS LIOCEPHALUS Wiegmann. 



Gerrhonotus Uocephalus Wiegmanx, Isis, 1828, p. 381.— BOCOUUT, Miss. Sc, Mex., 



Kept., 1878, p. 342.— GuNTHEH, Biol. C. Am., Rept., p. 41.— Boulengek, Cat. 



Liz. Brit. Mus., II, 1885, p. 275. 

 Gerrhonotus tessellatiis Gray, Cat. Liz., 1845, p. 53. — Wiegmann, Herpt. Mex., 



1834, p. 32, pi. X, lig. 3; Dumeril and Bibron, Erp. G6n., V, 1837, p. 405.— 



Aug. Dumeril, Cat. M6th. Coll. Rept. Mus. Paris, 1851, p. 143. 

 f Scincus veiitralis Peale aud Green, Jour. Acad. Nat. Sci. Phila., VI, 1830, 



p. 233. 

 ? Gerrhonotus infernalis Baird, Proc. Acad. Nat. Sci. Phila., 1858, p. 225; Emory's 



U. S. Mex. Bouud. Surv., 1859, p. 11. 

 ? Gerrhonotus ophiurns Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 321. 

 Gerrhonotus lemniscatus Bocourt, Nouv. Arch. Mus., VII, 1872, Bull., p. 105. — 



O'Siiaugnessy, Ann. Mag. Nat. Hist., XII, 1873, p. 45. 

 Pterogasterus ventralis Cope, Proc. Am. Phil. Soc, XVII, 1877, p. 96. 

 Fterogasterus tessellatus Cope, Proc. Am. Phil. Soc, XVII, 1877, p. 96. 

 Pterogasterus ophiurus Cope, Proc. Am. Phil. Soc, XVII, 1877, p. 96. 

 Pterogasterus infernalis Cope; Proc. Am. Phil. Soc, XVII, 1877, p. 96. 

 Pterogasterus lemniscatus Cope, Proc. Am. Phil. Soc, XVII, 1877, p. 96. 



This handsome species is widely distributed in eastern and central 

 Mexico, where it is represented by three well-marked subspecies, which 

 may yet come to be regarded as true species. A fourth subspecies is 

 found in western Texas, which differs less widely from the typical form. 

 The characters of these subspecies are as follows : 



One preocular, two loreals, posterior cauthal descending to labials. Legs separated 

 by length of hind leg. Belly immaculate ; tail shorter G. I. ventralis. 



No preoculars, two loreals, posterior canthal descending to labials. Tail moderate; 

 extended legs separated by length of forearm ; brown above, with ten cross bands; 

 belly black spotted G. I. Uocephalus. 



Two preoculars, three loreals, not separated by the single posterior canthal ; pre- 

 nasal in contact with first labial. Tail 2.75 times head aud body; exteuded limbs 

 separated by length of humerus; red, with ten light cross bands V-shaped back- 

 ward ; belly black spotted 0. I. ojihiurus. 



Three loreals, posterior canthal divided, each half corresponding to a loreal; pre- 

 nasal separated from contact with first labial; tail twice head and body. Light 

 olive, with seven or eight dark cross-bars; below yellowish marbled with olive. 



G. I. infernalis. 



The first subspecies is Pterogasterus ventralis Peale aud Green.^ and 

 and the typical specimen is from the Valley of Mexico. The G. I. 



' Journal Acad. Nat. Sci., Phila., VI, p. 223, 



