Vol. 1] VAN DENBURGH— GECKOS OF GALAPAGOS ARCHIPELAGO 417 



tubercles anywhere. Rostral much broader than high. Nostril between 

 rostral, first labial, and three nasals of which the upper is largest and meets 

 its fellow of the opposite side. Eight or nine upper and seven or eight 

 lower labials. Mental large, a little longer than broad, bordered behind 

 by four postmentals which are followed by polygonal shields which grad- 

 ually pass into the small granular gulars. Lower surface of body covered 

 with smooth, imbricate scales which change gradually into the granular 

 laterals and gulars ; about twenty-five to forty longitudinal, and sixty to 

 seventy transverse series. Tail covered with whorls of small smooth scales, 

 no inferior median series of broad plates. Limbs without enlarged tuber- 

 cles ; digits slender, distal pads large, truncate ; about twelve lamellae under 

 fourth toe. 



Yellowish or brownish gray above, palest on limbs and tail, irregularly 

 dotted with dark brown on head, neck, body, limbs, and tail. A trace of a 

 brown band may be made out from the nostril, through the eye and above 

 the ear, to the side of the neck. The lower surfaces are yellowish white, 

 faintly dotted and clouded with dark brown. 



Length to anus 43. 



Snout to orbit 4.5 



Snout to ear 10. 



Orbit to ear 3.3 



Fore limb 12.6 



Hind limb 17.5 



Base of fifth to end of fourth toe 4.4 



Variation. — All the specimens agree in the absence of scat- 

 tered enlarged tubercles between the hind limbs or elsewhere. 

 The number of the labials and the shape and size of the mental 

 plate are not constant. The postmentals in contact with the 

 mental are two in sixty-one specimens, three in eighty-four, 

 and four in three (Nos. 10818, 10826, 11994). The ground 

 color varies from a light brownish or yellowish gray to a dark 

 brown. Specimens of either light or dark ground color, may 

 show darker brown markings merely as scattered dots, as 

 indefinite cloudings, spots, or blotches, or as definite cross-bars. 

 The dark streak on the side of the face may be obsolete or 

 very clearly shown. The smallest specimen measures seventeen 

 millimeters from snout to anus. 



Coloration in life. — P. leei are flesh-colored with indistinct 

 black markings on the back; white underneath (Slevin). 



Habits. — The following notes by Mr. Slevin are based upon 

 both P. leei and P. tuberculosus: 



"Oct. 16, 1905. Geckos are rare at Wreck Bay. I found 

 ten during the day. They were under lava blocks. I saw very 

 few broken egg shells. Oct. 17. Worked up the road to the 

 settlement. Geckos were rare. I secured only seven or eight. 



