TEIID LIZAKDS OF THE GENUS CNEMIDOPHORUS 209 



ucukii's nuiJiially -i; supraocular granules usually not extending 

 forward past the anterior border of the third supraocular; front- 

 oparietals 2; parietals 3; occipitals small, anterior largest; anterior 

 gulars moderate, often nearly uniform in size; posterior gulars 

 small, uniform; mesoptychials rather small, median scutes largest, 

 in 5-7 transverse rows. 



Body moderately elongate; ventral plates in 8 longitudinal and 

 34r-37 transverse rows; dorsal granules small; limbs rather weak, 

 somewhat shortened in some specimens; brachials 4— G; antebrachials 

 2-4; brachials and antebrachials more or less continuous at a point 

 of contact; postantebrachium with small or slightly enlarged gra- 

 nules; femorals 7-9; tibials 3-4; femoral pores lG-20; tail elongate, 

 tapering; caudal i:)lates large, oblique, with rather strong lateral 

 longitudinal keels. 



Coloration distinctive; under surfaces usually suffused with moi-e 

 or less bluish, grayish, slate or blackish; gular region often rather 

 light; tail usually unicolor. often grayish above; subcaudal region 

 often uniform deep purplish black; back and femora covered by 

 many small or fine white spots and reticulations, these rarely show- 

 ing a definite transverse arrangement ; usually no indication of longi- 

 tudinal arrangement in the dorsal markings; dorsal ground color 

 grayish or brownish, usually light. 



The sj)ecimens of canus from North San Lorenzo and Sal Si 

 Puedes Islands are colored and marked dorsally like specimens of 

 inartyris^ with the exception that in canus the ground color is much 

 lighter. As in martyris^ there is some variation in the fineness of 

 the reticulations on the back, and the general ground color is sub- 

 jected to variation within reasonable limits. The individuals which 

 show a darker or lighter shade dorsally, also exhibit the same 

 chromatic variation ventrally. Although the general series of canus 

 looks light while being compared to martyris^ they are decidedly 

 dark when compared with sexlineatus^ and this applies even to the 

 lightest specimens. The gular region in most specimens is a uni- 

 form slate, but in a feAv individuals there is a smattering of black 

 spots; the breast is not deep blackish, but always some particular 

 intensit}^ of slate. The abdominal scutes are usualh^ witli dark 

 margins, the centers being light in color. 



A series of 17 typical specimens has been examined. These were 

 collected on Sal Si Puedes and North San Lorenzo Islands. The 

 data may be summarized as folloAvs: Body, 52-74 mm.; tail, 129- 

 176; total length, 181-242; length of tail as percentage of total 

 length, 71-75; Avidth of head, 7.0-10.5; width of head as percentage 

 of body length, 11.8-15.5; hind leg, 35-50; length of hind leg as 

 percentage of body length, 59-82; supraoculars, 3-4 in 2 specimens, 



