528 8. TEI1DM 



Distribution. This species is known only from Cerros 

 and Natividad islands, Lower California, Mexico. 



Remarks. I am unable to find the differences which 

 Cope stated to exist between this lizard and other members 

 of the tessellatus group. The nine specimens from Cerros 

 at hand seem to be more like C. t. stejnegeri than like any 

 other race, although they sometimes have the ashy suffusion 

 of the gular region seen in C. t. tessellatus. The large, well 

 defined black markings on the sides of the head and neck 

 and on the gular region are similar to those of C. /. stejne- 

 geri. The marking of the lower surface of the tail, how- 

 ever, is quite different. Each of the scales of the inferior 

 central rows has a large black central spot. No such regular 

 or abundant spotting is seen in this region in C. t. stejne- 

 geri. Twenty-three specimens from Natividad Island agree 

 with those from Cerros, but the black markings on the lower 

 surface of the tail are not quite so regularly distributed, and 

 those on the gular region are larger and more frequently 

 form cross-bars. 



