Vol. II, Pt. I] VAN DENB URGH—SLEVIN—GALAPAGOAN LIZARDS 159 



season, and the natives report having had no rain for some 

 time. 



General remarks. — The Chatham Island Tropidiirus is one 

 of the smaller species. The males are very prettily striped, 

 while the females are nearly unicolor. The crest is moderately 

 well developed in the males, low in the females. This species 

 agrees with the Bindloe lizard in having scales instead of 

 granules on the sides of the neck, a character which distin- 

 guishes these two species from all the other species of the 

 archipelago. 



Tropidurus delanonis Baur 

 Hood Island Lizard 



1889, Tropidurus grayi, Cope, Proc. U. S. Nat. Mus., XII, 1889, p. 145 

 (part) ; Boulenger, Ann. and Mag. Nat. Hist, (6), VII, 1891, p. 502 

 (part). 



1890, Tropidurus delanonis, Baur, Biol. Centralbl, X, 1890, pp. 478, 

 479 (type locality Hood Island, Galapagos Archipelago) ; Baur, Fest- 

 schrift fiir Leuckart, 1892, p. 270; Heller, Proc. Washington Acad. Sci., 

 V, 1903, p. 78. 



1890, Tropidurus hoodcnsis, Baur, reprints from Biol. Centralbl., X, 

 1890, pp. 478, 479 (substituting name) ; Baur, Festschrift fiir Leuckart, 

 1892, pp. 265, 270. 



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

 tween folds covered with granules, some small scales on ridges 

 of folds of large males; hind legs of males with definite dark 

 spots; interparietal plate seldom much broader than long; not 

 more than eighty scales around middle of body; 50 to 61 

 scales in crest; back not definitely spotted as in T. grayi; 

 much red in coloration; old males larger than in other 

 species. 



Types. — This species was described by Dr. Baur from thir- 

 teen specimens, numbered 15014 to 15026 of the U. S. Na- 

 tional Museum collection, which had been secured on Hood 

 Island by the naturalists of the "Albatross," in April, 1888. 



Distribution. — This species has been found only on Hood 

 Island and Gardner-near-Hood, Galapagos Archipelago. 



Material. — The Academy's collection contains about two 

 hundred and forty specimens from Hood, and twenty-three 

 from Gardner ; of which seventy males and sixty-eight females 

 from Hood, and seven males and six females from Gardner 

 have been included in the tables of scale counts. 



Description of adult male No. 11802. — The head is covered above with 

 smooth scales; interparietal largest, little if any broader than long; five 

 to seven large supraoculars ; superciliaries imbricate ; five superior and 



