Vol. II, Pt. I] VAN DENB URGH—SLEVIN—GALAPAGOAN LIZARDS 169 



None of these were designated as types. I have been unable 

 to learn their present location. 



Distribution. — This lizard has been found only on Barring- 

 ton Island, Galapagos Archipelago. 



Material. — The Academy's collection contains one hundred 



and fifty-five specimens, of which fifty-seven males and 



seventy-four females have been included in the table of scale 



counts. 



Description of adult male No. 10196. — The head is covered above with 

 smooth scales ; interparietal largest, broader than long ; five or six large 

 supraoculars ; superciliaries imbricate ; four superior and five inferior 

 labials, to below middle of eye ; rostral very broad and low ; symphyseal 

 broad, followed by a series of large sublabials, of which all but the first 

 are separated from the infralabials by a row of smaller plates. Ear- 

 opening large, with an anterior denticulation of four or five long, narrow 

 scales. Side of neck between ear-opening and fore limb with numerous 

 folds, covered with granular scales except on tops of folds. A strong 

 antehumeral, but no complete gular, fold. A well-developed median dorsal 

 crest begins half the length of the interparietal behind this plate, and runs 

 continuously to and along the tail, being highest on the proximal fourth of 

 the tail. The dorsal regions of the neck, body, and tail are covered with 

 rather small, keeled, mucronate scales, which, on the body, change gradu- 

 ally to smaller, keeled, mucronate laterals. These again change grad- 

 ually into the smooth ventrals, which are much smaller than the dorsals. 

 The gular scales are smooth, smaller posteriorly, smallest below the ears. 

 The scales on the chest are largest, smooth and imbricate. The 

 limbs are provided above with keeled, and below with smooth scales. The 

 posterior surface of the thigh is covered with weakly keeled, imbricate 

 scales. The lateral caudals are strongly keeled and mucronate ; while the 

 inferior caudals are smooth proximally, but become keeled on the distal 

 portion of the tail. 



The color above is olive brown, somewhat mottled on the top and 

 sides of the head. The dorsal surfaces of the body, neck, and fore limbs 

 show numerous dark brown or black spots or cross-bars. The lower sur- 

 faces are greenish white, lightest on the chin. The gular region is suf- 

 fused with dark gray, and the throat, chin and chest bear discrete, rounded 

 spots of blackish brown. 



Length to anus mm. 95 



Length of tail ..., 113 + 



Snout to ear 20 



Width of head 16 



Fore limb 41 



Hind limb 69 



Base of fifth to end of fourth toe 28 



Height of crest on nape 2 



Height of crest on midbody 1.5 



Height of crest on tail 2.8 



Coloration in life of adult male. — Above light grayish 



brown, tail darker grayish; whole upper surface except the 



head spotted with blue-gray; the dorsum anteriorly and fore 



limbs black-barred and spotted ; hind limbs and tail without 



dark bars. Head above olive green, grayish on sides and 



neck, black-spotted. A black antehumeral spot. Sides of 



