202 IGUANID^. 



millim. millim. 



Total length (tail re- Body 109 



produced) 300 Fore limb 52 



Head 26 Hind limb 98 



Width of head .... 21 



Lower California to Arizona. 



o. (5 . La Paz, California. Smithsonian Institution [P.]. 



42. SAUROMALUS. 



Sauromalus, A. Bum. Arch. 3Ius. viii. p. 535 ; Cope, Proc. Ac. Philad. 



1864, p. 177 ; Bocourt, Miss. Sc. Mex., Rept. p. 149. 

 Euphryne, Baircl, Proc. Ac. Philad. 1858, p. 253. 



Tympanum distinct. Body depressed ; no dorsal crest ; dorsal 

 scales small. Upper head-scales small. A strong transverse gular 

 fold; no gular pouch. Digits with tubercularly keeled lamellae 

 inferiorly. A long series of femoral pores. Tail rather short, cylin- 

 drical. Lateral teeth tricuspid ; no pterygoid teeth (?). 



South-western North America. 



1. Sauromalus ater. 



Sauromalus ater, A. Dum. I, c. p. 536, pi. xxiii. fig. 3 ; Bocourt, I. c. 



pi. xvii. bis. fig. 11. 

 Euphryne obesus, Baird, I. c, and U.S. Mex: Bound. Surv., Rept. 



pi. xxvii. 



Habit stout, head and body much depressed. Snout narrowed, 

 obtuse ; nostril a little nearer the end of the snout than the orbit, 

 directed upwards and sliglitly outwards ; upper head-scales small, 

 smooth, a little enlarged on the snout ; occipital not enlarged ; 

 labials small ; four conical scales forming a strong denticulation on 

 the anterior edge of the ear. Sides of neck strongly plicate, with 

 some large conical scales. Flanks longitudinally plicate ; a slight 

 median groove along the back. Dorsal scales small, squarish, 

 smooth, forming regular transverse series ; flanks granulate ; ventral 

 scales smooth, a little smaller than dorsals. Limbs strong, covered 

 "with scales larger than those on the body : thej- are smooth on the 

 arms and thighs, tubercular on the forearms and legs ; digits short. 

 Fourteen or fifteen femoral pores on each side. Tail scarcely longer 

 than head and body, cylindrical, depressed at the base, covered with 

 moderate-sized, equal, keeled, slightly spinose scales arranged in 

 verticils. Yellowish brown or olive-green, head and limbs some- 

 what lighter ; back dotted with black, with five broad transverse bars 

 in the young. 



millim. millim. 



From snout to vent 128 Tail 132 



Head 24 



Lower California and Sonora. 



