422 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



POSTMENTALS IN CONTACT WITH MENTAL PLATE. 



The enlarged tubercles vary considerably. The lower row 

 on the body may be well developed, or may be represented by 

 only a few tubercles. Counting these, there nearly always are 

 six rows on each side of the back. Exceptions are found in 

 specimens from Daphne, Cowley Island, Cowley Mt., and 

 Tagus Cove. The upper dorsal rows of tubercles are contin- 

 ued, more or less irregularly, forward to the back of the neck 

 anterior to the insertions of the fore limbs in all the specimens 

 except one from Tagus Cove and eight from Daphne. The 

 tubercles in the dorsal rows are set much closer together than 

 in P. hauri, being usually either in contact or separated by not 

 more than the diameter of one small granule. However, the 

 two specimens from Duncan Island have many tubercles of 

 the upper rows separated by greater spaces often occupied by 

 several small granules. A somewhat similar spacing is found 

 in one of the Indefatigable specimens (No. 10393), but none 

 of the other examples of P. galapagoensis show any approach 

 to this condition. 



The Daphne specimens have few or no enlarged tubercles on 

 the head, and a similar lack of them is found in the geckos 

 from Tagus Cove, Cowley Mt., Cowley Island, and Brattle. 

 In specimens from Indefatigable, James, and Duncan there are 

 many enlarged tubercles on the head. Examples from south- 

 ern Albemarle (Iguana Cove, Vilamil and Cobos Settlement) 

 show more variation in this respect, and may have on the head 

 many, a moderate number, or few enlarged tubercles. 



