43. CROTAPHYTUa. 203 



43. CROTAPHYTUS*. 



Crotapliytus, Holbr. X. Amcr. Ilevp. ii. p. 79 ; Baird^- Gir. in Stansb. 

 JE.vpeci. Gr. Salt Lake, p. .j.iJi) ; Bocoitrt, Miss. Sc. 31ex., liept. p. lo3. 

 Leiosauius, part., A. Dinn. Arch. Mus. viii. p. 5.'J2. 



Tympanum distinct. Body depressed ; no dorsal crest ; dorsal 

 scales small. Upper head-scales small. A transverse giilar fold ; 

 no gular poucli. Digits with sharply keeled lamelUe inferiorly. 

 A long series of femoral pores. Tail long, cylindrical. Lateral 

 teeth tricuspid; pterygoid teeth. No sternal fontanelle. No ab- 

 dominal ribs. 



Southern iSorlh America. 



1. Crotaphytus collaris. 



Agama collaris, Say, in Lony^s Expecl. Rockij Mount, ii. p. 252 ; 



Harlan, 3Ied. Phijs. lies. p. 142, pi. — . tig. 4. 

 Crotaphytus collaris, Holbr. I. c. pi. x. ; Wied, Nov. Act. Ac. Leop.- 



Car. xxxii. 1805, p. 5S ; Baird, Hep. U.S. Expl. Surv. xiii. pt. iii. 



p. 17, pi. xxiv. tig. 1 ; Cope, Proc. Ac. F/iilud. 18GG, p. o02 ; 



Bocourt, I. c. p. 154, pi. xvii. bis. tigs. 5, G. 

 Leiosaurus collaris, A, Dum. I. c. 



Head large, much depressed, very distinct from neck, especially 

 in the males, in which it bears resemblance to that of Geclco verti- 

 cillatus ; nostril large, turned upwards and outwards, a little nearer 

 the end of the snout than the orbit ; ear-opening large, vertically 

 reniform ; scales on the snout a little enlarged, irregular, convex ; a 

 series of enlarged supraorbital scales, in contact or fusing with each 

 other between the orbits ; siipraocular scales small ; back of the 

 head with small granules ; occipital not enlarged ; labials very 

 small ; a series of enlarged infraorbital scales, very variable in 

 number and in size, the median one sometimes much elongate, 

 owing to the fusion of two or three scales. Throat covered with 

 small granules, which are slightly enlarged and flat in front of the 

 gular told. Sides of the neck strongly plicate. Dorsal scales uni- 

 form small juxtaposed granules ; ventral scales larger, flat, hexa- 

 gonal. Limbs long ; the adpressed hind limb reaches the eye or the 

 tip of the snout ; digits rather long. Seventeen to twenty femoral 

 pores on each side. Tail slender, cylindrical, nearly twice as long 

 as head and body, covered with uniform, small, smooth or feebly 

 keeled scales. Brownish or olive above, back guttate with whitish ; 

 two parallel oblique black bands on each side across scapular region, 

 usually separated on the median line of the nape ; lower surfaces 

 white ; throat frequently spotted with grey. 



* Crofaphi/fus rdiculafu.': Baird, Prcc. Ac. Piiilarl. 18.58, p. 2.53.— Texas. 

 Crotaphytus copeii. Yarrow, Proc. U.S. Nat. Mus. v. 1882, p. 441. — 

 La Paz, California. 



