49. scKLOPORirs. ' 233 



between the end of the snout and the posterior border of the ear. 

 , Fourteen to eighteen (twenty-two) femoral pores. Caudal scales 

 ,/ much larger than dorsals. Male with enlarged postanal scales. 

 Brownish, oUve, or green above, the sides marbled with black ; 

 dorsal region immaculate, or irregularly spotted with black and 

 whitish, more oftoii with a double series of angularly curved black 

 markings pointing forwards ; head frequently with transverse black 

 lines ; usually a large black spot in front of the shoulder, sometimes 

 connected with its fellow across the throat ; lower surfaces yellowish 

 or greenish, throat sometimes marbled with grey : male with the 

 throat and the sides of the belly blue, broadly edged with black near 

 the narrow whitish median ventral line. 



17. Sceloporus seneus. 



Tropidolt'pis peneus, firai/. Cat. p. 210. 

 Sceloporus a3neus, Wie(/m. Isis, 1828, p. .370, and Ilerp. Mex. p. •'iO ; 



Bocotirt, Miss. Sc. Mex., Sept. p. 205, pi, xviii. his, fig. 4 ; Cope, 



Proc. Am. Philos. Soc. xxii. 18<S5, p. •■J&4. 

 Tropidolepis leneus, Dian. S,- Bibr. iv. p. 309. 



Head-shields keeled or striated ; an irregular series of feebly 

 dilated transverse supraocnlars ; one or two canthal scales ; occipital 

 as long as broad ; parietals very small ; anterior border of ear very 

 slightly denticulated. Dorsal scales larger than vcntrals, strongly 

 keeled, sharply pointed, forming parallel longitudinal series ; forty 

 to forty-four scales between the occipital and the base of the tail ; 

 six to ten scales correspond to the length of tlie shielded part of the 

 head ; lateral scales nearly as large as the dorsals, more or less dis- 

 tinctly keeled, forming straight longitudinal or sliglitly oblique 

 series ; ventrals smooth, mostly bicuspid ; forty to forty-six scales 

 round the middle of the body. The adpressed hind limb reaches 

 hardly the axilla in the female, the shoulder or a little beyond in the 

 male ; tibia not quite as long as the shielded part of the head ; the 

 distance between the Itasc of the fifth toe and tlic extremity of the 

 fourth e(|uals or slightly exceeds the distance between the end of 

 the snout and the ear. Fourteen to nineteen femoral pores on each 

 side, the two series meeting medially. Caudal scales as hirge ajs, or 



