SCHMIDT, THE EERPETOLOQY OF PORTO RICO 193 



Ameiva alboguttata Boulenger 



Forty-two specimens were collected on Mona Island. This species is 

 confined to Mona Island, where it is abundant on the low terrace to the 

 west and south. 



Ameiva alboguttata is # extremely close to Ameiva exsul, but may be 

 distinguished by the more spotted dorsum. The Mona Island form does 

 not exhibit the tendency to enlargement of an additional row of ventral 

 plates, one specimen having only eight longitudinal rows of ventrals (No. 

 13739). 



The results of the examination of twenty stomachs are as follows : 

 Empty, 4; vegetable matter (chiefly red-coated seeds), 8; unidentifiable 

 insect remains, 3 ; beetles, 3 ; crickets, 2 ; land snails, 2 ; Anolis crista- 

 tellus (juv.), 1. 



Ameiva wetmorei Stejneger 



Twenty-seven specimens were cpllected from Ensenada. This species, 

 hitherto known only from two specimens, appears to be confined to the 

 region near Ensenada. It probably ranges westward toward Cabo Rojo 

 and eastward toward Ponce, on the limestone hills. Ameiva lineolata, its 

 relative in Hispaniola, appears to be similarly confined to the more arid 

 parts of that island, and arid or semiarid conditions prevail also on 

 Great Inagua and St. Croix, each of which is inhabited by a related 

 species. These four species form a highly interesting group of Ameivas, 

 characterized by the oblique scales of the tail, a distinctive habitus, and 

 a lineolate type of coloration. 



In the present series the prefrontals are broadly in contact in twenty- 

 one specimens, meet at a point in one, and are separated by a suture 

 between the frontal and frontonasal in three. The number of supra- 

 ciliaries varies from five to seven; normally six. The interparietal is 

 horizontally divided in one specimen. There are usually two or three 

 transversely enlarged postoccipitals. On the whole, there is a remark- 

 ably small degree of variation. 



The measurements of a male and female specimen are: 



A. M. N. H. 

 No. 13821 $ No. 13828 9 



Total length (tail reproduced at tip) 169 mm. 147 mm. 



Body 52 " 45 



Length of head 12.5 " 11 



Breadth of head 8.5 " 6.5 " 



Foreleg 1G " 14 



Hind leg 30 " 20 



