bakboue: vektebrata of gorgona island. 99 



The two representatives of the Geckonidae are indistinguishahle from 

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

 Sphaerodad ijki^ occurs in the collection. Of the lyuanidae tlie Anolis, 

 thouoh quite different from, is probably a modification of, A. andianus. 

 The series of Basiliscus americanus and the single young Ljuana 

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

 very kindly examined the EnyaUoides a,nd the two amphibians. For this 

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

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

 difference from A. bridgesii, 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 {Leptoi^s occidentalis) differs 

 sufficiently to warrant its being considered a new subspecies. The 

 Spilotes agrees well with Gunther's figure of S. cm/us in the Biologia 

 Ceutrali-Americaua. The LejJtodeira 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. Gonatodes fuscus (Hallowell). 



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 

 difftn-s in having five rows of loreal scales, no tricarinate supraoculars, and six 

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

 continental species. 



Ear opening medium and round. Body hardly compressed. Ventrals 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 



