626 REPORT OF NATIONAL MUSEUM, 1902. 



The Porto Ricau species of AnoUs are easily identified when alive 

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

 Thus the large A. cuvieri is not only easily 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. stratidus is more or less drab, brownish, or grayish, mostl}" with 

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

 dewlap, or pendant throat fan of the male, is deej) 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. pidchellus, hrugi^ ^w^jpon- 

 censis form a small group bj^ themselves, charac- 

 terized by the coloration, which is disposed in 

 longitudinal stripes. Of these A. jponcensis is at 

 Fig. 80.— scutellation once distinguished by the lack of a distinctive color 

 OF TOP OF HEAD OF ANo- ^q thc dcwlap, whlch is entirely covered by the 



LIS. CT, canthus rostra- tij.i^ 77 77 17 -xiii 



lis; oc, occipital; r, ros- scales. in Doth A. 'pmc/u'Uus 'Jiwa krvgt the dewlap 

 trai; sc, superciiiarics; jg naked with distant scales, red in the former and 



sod, supraocular disk; • ii i i - i -i i • i -i i 



SOS, supraorbital semi- ycllow lu the latter, as described in detail under 



^"^^^^- 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 alwaj^s be com- 

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

 of characters. 



KEY TO THK SPECIES OP ANOLIS RECORDED PROM PORTO RICO. 



o^ Dorsal scales entirely separated from each other by several circles of granules 



(fig. 84) -.4. cuvieri, p. 627. 



(/^ Dorsal scales juxtaposed or imbricated. 



fc^ 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^ Two, or more, shields or scales between the superciliaries and the supraocular 

 semicircle bordering the supraocular granules anteriorly. 



