BAEBOUR: VERTEBRATA OF GORGONA ISLAND, 99 



Tlie two representatives of the Geckonidae are indistinguishable from 

 widely spread mainland forms. One notes with surprise the fact that no 

 Sphaerodadylus occurs in the collection. Of the Iguayiidae the Anolis, 

 though quite different from, is probably a modiMcation of, A. andianus. 

 The series of Basiliscus americanus and the single young Iguana 

 tuherculata are typical of their respective species. Dr. Stejneger has 

 very kindly examined the Enyalioides and the two amphibians. For this 

 kindness I wish to thank him. He considers E. heterolepis as the 

 nearest relative of E. iiisulae. The specimens of Ameiva show a constant 

 difference from A. bi'idgesii, in the weak carination of the dorsal scales. 

 With only four specimens from Gorgona Island, and these all of the same 

 age, it hardly seems desirable to name the island specimens. 



Of the snakes,* the Green Tree Snake (Leptophis occidentalis) differs 

 sufficiently to warrant its being considered a new subspecies. The 

 Spilotes agrees well with Gunther's figure of S. argus in the Biologia 

 Centrali-Americana, The Leptodeira belongs to a wide-ranging species 

 of the Continent. 



Owing to the luxuriant vegetation, Mr. Brown used his gun very 

 freely in collecting reptiles, and there are several specimens so imperfect 

 that they cannot be identified, but which lead one to believe that there 

 are other new forms, besides those described. 



Reptilia. 



GECKONIDAE. 

 1. Gonatcdes fuscus (Hallo well). 



Nine typical examples. 



2. Gonatodes caudiscutatus (Gunth.). 

 Four examples. 



IGUANIDAE. 



3. Anolis gorgonae, sp. nov. 

 Types. — Mus. Comp. Zool., No. 6,984, Gorgona Island. 



Three specimens nearly related to A. andianus Blgr. From this species it 

 differs in having five rows of loreal scales, no tricarinate supraoculars, and six 

 labials to below the centre of the eye. The hind limb is longer than in the 

 continental specie?. 



Ear opening medium and round. Body hardly compressed. Yentrals small, 

 but considerably larger than the dorsals and strongly imbricate. The ap- 

 pressed hind limb reaches a point halfway between the orbit and the tip of 



