REPTILES 77 



Distributed generally over the entire extent of Barrington Island but 

 most abundant about the sand beaches. 



Food insectivorous. All the stomachs examined contained insects, 

 chiefly Orthoptera. 



Many of the females secured during our visit (May 29-30) con- 

 tained large eggs. 



TROPIDURUS DUNCANENSIS Baur. 



Tropidurus grayi COPE, Proc. U. S. Nat. Mus., xn, p. 145, 1889 (part). 



BOUL., Ann. N. H. (6), vii, p. 502, 1891 (part). 

 Tropidurus duncanensis BAUR, Biol. Centralbl., x, p. 477, 1890, and Festschr. 



Leuckart, p. 270, 1892. 



Range. Galapagos Archipelago ; Duncan Island (Albatross 1888, 

 Baur, Hopkins Stanford Expedition). 



Specific Characters. Belly and tail inferiorly red ; breast and 

 mandible dark-spotted ; throat black. Sides of neck granular, much 

 folded behind ear-opening. Scales small, 80 to 90 in circumference 

 of body. Length of head and body: of male 83 to 95 mm., of 

 female 70 to 76 mm. 



Plates on top of head variable as in T. g. grayi. A single small 

 frontal plate; prefrontals usually four, large. Parietal large, bor- 

 dered laterally by two temporals. Dorsal crest in male of medium 

 height ; highest on tail ; height at nape one half internasal width. 



Coloration of adult male, Cat. No. 4912, Stan. Univ. Mus. Above 

 olive-brown, black-spotted except the head ; tail more brownish with 

 few dark spots; hind limbs and tail light blue-gray-spotted; fore- 

 limbs dark-spotted like back. Sides of head and body from snout to 

 tip of tail brick red, finely black-spotted on sides and along the belly 

 where the red is brightest ; a black antehumeral spot. Throat black ; 

 breast, mandible and fore limbs reddish, black-spotted ; chin, belly, 

 and hind limbs and tail inferiorly red. 



Twelve males are in the collection. In some the breast as well as 

 the throat is black, in others it varies from red to orange, black- 

 spotted. A few are spotted with blue-gray on back. 



Length of head and body 83 to 95 mm. 



Coloration of adult female, Cat. No. 491 9, Stan. Univ. Mus. 

 Above olive-brown. Sides of head and body from snout to tip of 

 tail brick red, darkest dorsally where the red extends high up and en- 

 croaches on the dorsum, brightest along belly ; a black antehumeral spot. 

 Below red from mandible to tip of tail, darkest anteriorly on lower 

 jaw, brightest on tail ; breast and belly lighter, breast darkspotted. 



