No. 6. — A Revision of the Lizards of the genus Ameiva. By Thomas Barbour and G, Kingsley Noble. INTRODUCTION. This paper is based almost wholly upon the collection in the Mu-seum of Comparative Zoology; 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 Zoological 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 Ameiva polops and Ameiva tohagana, 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 praesignis and A. ameiva ameiva. GENERAL CONSIDERATIONS. The genus Ameiva, because it ranges widely through the West Indies, Central and South America, is an excellent subject for careful zoogeographic study. Almost every one of the Antilles, which has been carefully collected, has been found to support a peculiar species,
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