Vol. II, Ft. I] VAN DENB URGH—SLEVIN—GALAPAGOAN LIZARDS 143 



T. pacificus. — p 



d.- — Head not speckled above; more or less suffused with 

 red; scales around body 76 to 92. Duncan. 

 T. duncanensis. — p. 

 CC.2 — Scales around body fewer than 76. 



dd. — Scales smaller, 61 to 76 around body. Barrington. 

 T, albemarlensis barringtonensis. — p. 

 (ld.=— Scales larger, 50 to 69 around body. Indefatigable, 

 James, Jervis, Albemarle, Narborough, etc: 

 T. albemarlensis. — p. 



Tropidurus pacificus Steindachner 

 Abingdon Island Lizard 



1876, Tropidurus {Cranio peltis) pacificus, Stfindachner, Festschrift 

 Zool-Bot. Ges. Wien, 1876, p. 313, pi. II, fig. 3 (type locality Indefati- 

 gable [?] and Bindloe Islands, Galapagos Archipelago), 



1877, Liocephalus pacificus, Gunther^ Proc. Zool. Soc. Lond., 1877, p. 

 67 (part). 



1885, Tropidurus pacificus, Boulenger, Cat. Lizards Brit. Mus., II, 1885, 

 p. 173; Cope, Proc. U. S. Nat. Mus., XTI, 1889, p. 147; Boulenger, Ann. 

 and Mag. Nat. Hist, (6), VII, p. 501 (part); Baur, Festschrift fiir 

 Leuckart, 1892, p. 270; Heller, Proc. Washington Acad. Sci., V. 1903, p. 83. 



1890. Tropidurus abingdonii, Baur, Biol. Centralbl., X, 1890, p. 479 

 (type locality Abingdon Island, Galapagos). 



Diagnosis. — Sides of neck with numerous folds; skin be- 

 tween neck- folds granular; hind legs without definite blackish 

 spots; interparietal usually much broader than long; 83 to 101 

 scales around middle of body ; top of head mottled or speckled 

 v/ith light color ; a middorsal light streak in males. 



Type. — Vienna Museum. Collected by Dr. Habel on "In- 

 defatigable [ ?] and Bindloe Islands," Galapagos Archipelago. 

 Specimens with the high scale counts given by Dr. Steindach- 

 ner, however, could only have come from Abingdon. 



Distribution. — This species occurs only on Abingdon Island, 

 Galapagos Archipelago. 



Material. — The Academy's collection contains about one 



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



sixty-five females have been included in the scale counts. 



Description of adult male. No. 12587. — The head is covered above with 

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

 supraoculars ; superciliaries imbricate ; five 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 five or six Jong, narrow 

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

 folds, covered with granular scales. A strong antehumeral, but no com- 

 plete gular, fold. A well-developed medium 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. 



