626 EEPOKT OE 1 NATIONAL MUSEUM, 1902. 



The Porto Rican species of Anolis are easily identified when alive 

 or recently killed, their colors being in most cases quite characteristic. 

 Thus the large A. cuvieri is not only easiW recognized by its size 

 and the peculiar flat, bony surface of the head as well as the separa- 

 tion of the dorsal scales by granules, but also by its more or less 

 greenish coloration. 



A. evermanni is also green, but it is a small species and the terminal 

 third of the tail is black. 



A. st'ratulus is more or less drab, brownish, or grayish, mostly with 

 a double series of blackish spots along the middle of the back, and the 

 dewlap, or pendant throat fan of the male, is deep orange. 



A. cristatellus and A. gundlachi are also more or less brownish or 

 grayish, though while alive many specimens, especially of the latter, 

 are nearly black, but the dewlap is more or less tinged with olive or 



greenish in addition to the orange. A. gundlachi 

 is, moreover, easily characterized by the metallic 

 blue color of the "white" of its eyes, and by the 

 oblique series of bead-like yellowish spots on the 

 flanks. 



The three species A. pulchellus, krugi, and pon- 

 censis form a small group by themselves, charac- 

 terized by the coloration, which is disposed in 

 longitudinal stripes. Of these A. jponcensis is at 

 fig. so.— scutellation once distinguished by the lack of a distinctive color 

 oftopofheadofAno- to t k e dewlap, which is entirely covered by the 

 lis; ' oc, occipital-, r, ros- scales. In both A. pulchellus and Jcrugi the dewlap 

 trai; sc, superciiiaries; j s na k e d w ith distant scales, red in the former and 



sod, supraocular disk; . . 



sos, supraorbital semi- yellow in the latter, as described in detail under 



circle - the respective species. 



With female specimens, as well as those preserved in alcohol, 

 recourse must be had to the structural characters as contrasted in the 

 " key." It is not always, however, that a single character is sufficient. 

 Sometimes a criterion based on the presence or absence of a scale fails, 

 mostly only on one side of the specimen, so that it is always advisable 

 to examine both sides. Moreover, a specimen should always be com- 

 pared with the detailed description to see if it agrees in the majority 

 of characters. 



KEY TO THE SPECIES OF ANOLIS RECORDED FROM PORTO RICO. 



a 1 Dorsal scales entirely separated from each other by several circles of granules 



(fig. 84 ) 1. cuvieri, p. 627. 



a 2 Dorsal scales juxtaposed or imbricated. 



b l Dorsal scales (all, or with the exception of two rows on the median line) granu- 

 lar or tubercular, differing but little, if at all, from laterals, but very much 

 from the much larger ventrals, which are smooth or feebly keeled. 

 c 1 Two, or more, shields or scales between the stipendiaries and the supraocular 

 semicircle bordering the supraocular granules anteriorly. 



