314 BARBOUR: ZOOGEOGRAPHY. 



Ameiva fuscata Gabman. 

 Gabman, Bull. Essex inst., 1887, 19, p. 5. 



This fine lizard is confined to the island of Dominica. The types are M. C. Z., 

 No. 6,087. Giinther (Ann. mag. nat. hist., 1888, ser. 6, 2, p. 363) says of this 

 species, "Closely allied to A. surinamensis; the Dominica form may be kept dis- 

 tinct on account of the modified scutellation of the fore and hind feet. The large 

 scutes of the forearm are separated from the rows of scutella of the toes by broad 

 areas of very minute scales." From this, it will be seen that the species is a 

 very distinct one: 



Ameiva aquilina Gakman. 

 Gabman, Bull. Essex inst., 1887, 19, p. 3. 



This species is really close to A . surinamensis, as would be expected from the 

 situation of the islands which this species inhabits, Grenada and St. Vincent. 

 The greater number of femoral pores and a number of other characters, some of 

 which, though perhaps not all, may be found diagnostic in each individual, so 

 that the specimens may always be separated quite easily. The types are 

 M. C. Z., No. 6,088 and 6,089. 



Dr. Allen procured eight specimens, mostly about St. George, Grenada. 

 He was told by local observers that some years ago the species almost disappeared 

 on account of the mongoose, but that at the present time it appeared to be gain- 

 ing considerably in numbers. This is very interesting, since I learned in Jamaica 

 that exactly the same thing had occurred there, with Ameiva dorsalis Gray. 

 This would indicate that some sort of a balance is being reached, compensating 

 for the introduction of the mongoose. The lizards may have gradually changed 

 their habits, though this does not appear from field observations; or they may 

 have grown shyer. They are certainly very wary now, and can usually be got 

 only by shooting. 



Tiaporus fuliginosus Cope. 

 Cope, Proc. Amer. philos. soc, 1892, 30, p. 132, pi. 



This lizard, which Cope states stands in the same relation to Ameiva as 

 Monoplocus does to Centropyx, is said to have been found only on Swan Island. 

 The monotypic genus is thus very narrowly restricted. I had the opportunity 

 to study the types at the U. S. national museum, by the courtesy of Dr. Stejneger. 



Since this was written Mr. George Nelson has made several collecting trips 

 to Swan Islands. He reports that no such lizard as this Ameiva-like Tiaporus 

 exists on the Islands. The Jamaicans and Cayman Islanders living at Swan 



