1897.] LTZABDS OF THE GENlTS SOELOtORCTS. 501 



Hah. Lower California. Numerous specimens were obtamed at 

 San Jose del Cabo, Miraflores, and in the Sierra San Lazaro and 

 Sierra El Taste. 



15. SCELOPOEUS rOEMOSUS. 



Sceloporus formosus, Wiegm. Herp. Mex. p. 50, pi. vii. fig. 2 

 (1831) : Bocourt, Miss. Sc. Mex., Eept. p. 182, pi. xviii. fig. 3 

 (1874); Bouleng. Cat. Liz. ii. p. 222 (1885). ^ 



Tropidolepis forraosus, Dum. & Bibr. Erp. Gen. iv. p. 303 (1837). 



Sceloporus mcdacJiiticus, Cope, Proc. Ac. Philad. 1864, p. 178, 

 and Proc. Amer. Philos. Soc. xxii. 1885, p. 394. 



Sceloporus luncei, Bocourt, 1. c. p. 184, pi. viii. bis, fig. 5 ; Cope, 

 1. c. p. 395 ; Giinth. Biol. C.-Am., Eept. p. 67 (1890). 



Sceloporus smccrar/clinus, Bocourt, 1. c. p. 186, pi. xviii. fig. 6 and 

 pi. xix. fig. 1 ; Giinth. 1. c. p. 68. 



Sceloporus viviparm, Cope, Proc. Amer. Philos. Soc. xxii. 1885, 

 p. 398. 



Sceloporus tceniocnemis, Cope, 1. c. p. 399. 



Sceloporus torquatus formosus, Cope, 1. c. p. 402. 



Sceloporus irazuensis, Giinth. 1. c. p. 67. 



Sceloporus salvini, Giinth. 1. c. p. 68. 



Head-shields smooth: frontal transversely divided, usually in 

 contact with the interparietal ; latter as long as broad or a little 

 broader than long, much larger than the parietals, which may be 

 divided ; a series of three to five more or less enlarged, transverse 

 supraoculars, bordered inwards by a complete or incomplete 

 series of scales ; one, two, or three series of scales between the 

 large supraoculars and the supraciliaries ; one or two canthal 

 scales ; three or four pointed scales, not or but a little larger than 

 those before them, form a denticulation on the anterior border of 

 the ear. 



Dorsal scales much larger than ventrals, as long as broad or a 

 little broader than long, strongly keeled, moderately or shortly 

 mucronate, entire or tri- or quinque-cuspid, the keels forming 

 parallel lines or obliquely converging towards the middle Line on 

 the posterior part of the back ; 35-45 scales between the inter- 

 parietal shield and the base of the tail ; 8 or 9 scales (exceptionally 

 10), taken in the middle of the back, correspond to the length of 

 the shielded part of the head. Lateral scales graduating into 

 dorsals and ventrals, strongly keeled, pointing upwards and back- 

 wards. Ventral scales small, smooth, hi- or tricuspid. 38-52 

 scales round the middle of the body. 



The adpressed hind limb reaches the shoulder, the collar-fold, or 

 the ear ; tibia as long as or slightly longer than the shielded part 

 of the head ; the distance between the base of the fifth toe and the 

 extremity of the fourth equals or slightly exceeds the distance 

 between the end of the snout and the collar-fold. 11-16 femoral 

 pores on each side. 



Caudal scales as large as or a little larger than dorsals, strongly 

 keeled and mucronate. Males with enlarged postanal scales. 

 As Bocourt, Cope, and Giinther all agree to consider the 



