Vol.1] VAN DENBURGH— GECKOS OF GALAPAGOS ARCHIPELAGO 415 



The largest and smallest specimens measure 



Length to anus 55.5 23. 



Snout to orbit 7. 3. 



Snout to ear 13.7 7. 



Orbit to ear 5. 2.2 



Fore limb 19. 9. 



Hind limb 24. 9.8 



Base of fifth to end of fourth toe 6. 3. 



Coloration in life. — "The back is slate-blue with black mark- 

 ings, and a light stripe runs from the neck to the middle of the 

 back. The lower surfaces of the body are pale lemon, and the 

 throat is light flesh color" (Slevin). 



Variation. — All the specimens before me have two post- 

 mentals in contact with the mental. The median band of small 

 granules is constantly present, as is the series of enlarged sub- 

 caudals. There is much variation in the number and extent of 

 the rows of enlarged, keeled, dorsal tubercles. These tuber- 

 cles always are smaller than in any other Galapagoan geckos, 

 and set close together in the rows. A row is almost always 

 present from the neck to the base of the tail immediately out- 

 side the middorsal band of small granules. Other rows of 

 enlarged tubercles are most in evidence on the sacral region 

 and base of tail and between the forelimbs. There may be 

 traces of only one or of two or three rows on each side of the 

 back anteriorly; on the base of the tail there usually are three 

 or four ; while just in front of the hind legs there are four or 

 five rows. The internasal plates are separated in several speci- 

 mens. The lamellae under the fourth toe vary in number from 

 twelve to sixteen. 



The ground color is light yellowish gray in young, darker 

 grayish brown or brown in adults. All specimens show at 

 least a trace of the light gray middorsal band. This band may 

 extend the whole length of the back or may be limited to the 

 neck, where it is always most evident. Some specimens have 

 no dark markings. The majority show, along the back of the 

 neck and body, six or eight pairs of more or less definite dark 

 brown blotches, which often are edged posteriorly by lateral 

 branches of the light middorsal stripe. A brown band is 

 usually present on the side of the face, but sometimes is nearly 

 obsolete. 



Habits.— ''Sti^t 24, 1906. Landed on the N. E. end of 

 Wenman Island, and climbed up on a small plateau covered 



