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



173 



borough Island, and is No. 3974 in the collection of Leland 

 Stanford Junior University. 



Distribution. — This lizard has been collected on Indefa- 

 tigable, South Seymour, Daphne, James, Jervis, Cowley, Brat- 

 tle, Albemarle, and Narborough islands, Galapagos Archi- 

 pelago. On Albemarle Island it has been found at Bank's 

 Bay, Tagus Cove, Cowley Mountain, Iguana Cove, and the 

 southeast coast near Vilamil or Turtle Cove. 



Material. — The Academy's collection contains specimens 

 about as follows : 



Indefatigable Island, 72; scales counted in 24 males, 42 females. 



Narborough Island 101 



Description of adult male No. 12287, Tagus Cove, Albemarle Island. — 

 The head is covered above with smooth scales ; interparietal largest, 

 broader than long; five or six large superoculars ; superciliaries imbricate; 

 five superior and five inferior labials, to below middle of the eye; rostral 

 very broad and low ; symphyseal broad, followed by a series of large sub- 

 labials, 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. Sides of neck between ear-opening 

 and fore limb with numerous granular 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 gradually to smaller, 

 keeled, mucronate laterals. These again change gradually into the smooth 

 ventrals, which are much smaller than the dorsals. The gular scales are 

 smooth, smaller centrally, smallest below the ears. The scales of 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 imbricate scales, which, toward the dorsal surface 

 of the thigh, become keeled. 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 coloration in alcohol is olive brown above, spotted, except on the 

 head, tail, and hind limbs, with small rounded, blackish spots, each cover- 

 ing one or more scales. The chin is yellowish. The throat is black. The 

 other lower surfaces are greenish or yellowish, marked on the chin, gular 

 region, chest, and sides of body with discrete, rounded spots of black or 

 dark brown. 



