No. 6.— A Revision of the Lizards of the genus Ameiva. 
By Tuomas Barspour AND G. KINGSLEY NOBLE. 
INTRODUCTION. 
_ Tuts paper is based almost wholly upon the collection in the Mu- 
seum of Comparative Zodlogy; we have, however, had loaned for 
study some important specimens from other institutions and wish to 
thank Dr. Leonhard Stejneger and the U. S. National Museum, 
Henry W. Fowler Esq., and the Academy of Natural Sciences of 
Philadelphia, as well as Dr. A. G. Ruthven and the Zoélogical Museum 
of the University of Michigan, for valuable aid. From the two latter 
institutions we have received important specimens in loan or exchange; 
from Dr. Stejneger permission to study in Washington the types of 
Amewa polops and Ameiva tobagana, as well as complete sets of photo- 
graphs and notes of these important specimens for study in Cambridge. 
Citations of original descriptions have been omitted, also synonyms, 
except where these have been changed or added to. Both have already 
been adequately given in Boulenger’s Catalogue of Lizards in the 
British Museum, 2, with later changes in Barbour’s ‘West Indian 
Herpetology,’ Mem. M. C. Z., 44, no. 2. | 
Some characters, such as the entry of granules between the gulars 
and the extent to which they may do so, have been found to be vari- _ 
able and hence have been omitted in drawing up the descriptions. 
So far as possible all characters which have been found to be really 
diagnostic have been included. Special attention is called to the fact 
that, making allowance for the variation connected with age or sex, 
color-pattern has been found to be of excellent taxonomic value. This 
statement is made upon the basis of the study of the very extensive 
series of some races such as A. ameiva pracsignis and A. amewwa ameiva. 
GENERAL CONSIDERATIONS. 
The genus Ameiva, because it ranges widely through the West 
_ Indies, Central and South America, is an excellent subject for careful 
| zodgeographic study. Almost every one of the Antilles, which has 
