SAUROMALUS 93 



perhaps by crawling about in crevices. One individual se- 

 cured had lost the front foot on one side and the hind 

 foot on the other, and in spite of its misfortune was lively 

 and had a stomach full of food. One chuckwalla was seen 

 up in a small creosote bush from which most of the leaves 

 bad been stripped. The three stomachs examined contained 

 plant remains. In two cases the leaves were swallowed 

 entire and belonged to a composite (Franseria dumosa) and 

 a spurge {Eu-phorbia folycarfa) ; the other stomach con- 

 tained many chewed leaves and stems." 



1 1 . Sauromalus townsendi Dickerson 

 TiBURON Island Chuckwalla 



? Sauromalus Belding, West. Amer. Scientist, Vol. Ill, 1887, p. 97. 



Sauromalus toicnsendi Dickerson, Bull. Amer. Mus. Nat. Hist., Vol. 

 XLI, 1919, p. 464 (type locality, Tiburon Island, Gulf of Cali- 

 fornia, Mexico) ; Nelson, Mem. Nat. Acad. Sci., Vol. XVI, 1921, 

 p. 171. 



Descriftion. — Head and body large, much depressed, 

 the latter very broad. Head almost triangular, With nar- 

 row rounded snout, and covered with small plates largest 

 on frontal and temporal regions. Nostrils opening up- 

 ward, outward, and slightly backward, in round plates a 

 little nearer to end of snout than to orbits. Superciliaries 

 like supraoculars, small and juxtaposed. Suboculars all 

 short, but slightly keeled. Rostral plate very small. 

 Labial plates small and of about equal size. Symphyseal 

 plate long but very narrow. Several series of slightly en- 

 larged sublabials passing gradually into the finely granular 

 gulars. Gular fold covered with very small scales. Ear- 

 opening large, almost vertical, with strong anterior denti- 

 culation of spinose scales. A' strong fold on each side of 

 neck, bearing numerous spinose tubercles. Nuchal scales 



