12 Papers from the Department of Marine Biology. 



Anolis pulchellus Dumeril and Bibron. 



Seven very interesting examples from the Virgin Islands which agree very 

 well with Dr. Stejneger's description and figures of Porto Rican material. 

 In alcohol these examples are all pale brownish. A dark brownish, well- 

 defined streak alongside of snout below canthus rostralis to eye and contin- 

 ued back from latter well above ear alongside of back, and on trunk more or 

 less broken into spots irregularly to groin. Below ear on each side of lower 

 surface of head a brownish streak to shoulder, though not evident in young. 

 Upper surface of body or back between dark lateral bands with speckling of 

 brownish, mostly obscured, and arranged largely in lengthwise courses. Sim- 

 ilar markings also seen on upper surface of head in some examples. 



Variation is seen in the scales separating the supraocular semicircles. In 

 one case a pair of plates of the latter are largely in contact, in another instance 

 two rows of scales intervene, while in the other a single complete row occurs. 



Anolis poncensis Stejneger. 



Four from Guanica, Porto Rico. This species was heretofore known only 

 from the type locality at Ponce, where it was obtained April 16, 1900. It 

 difiers from the other Porto Rican species of Anolis in the completely keeled 

 scales of the back, sides, and belly. In coloration my material agrees with 

 Dr. Stejneger's account, the young or smaller example showing the pale ver- 

 tebral band bordered on each side by a dusky parallel and equally wide band. 

 It also shows a pale obscure orange blotch at and on each side of the occiput, 

 the whole three indistinctly joined. One example is conspicuously greenish 

 above, mottled with dusky. 



The squamation of the supraocular semicircles is sometimes quite irregular, 

 and these may have two pairs in contact or be separated by a very narrow 

 median row. 



TEHD^. 

 Ameiva exul (Cope). 



Six from Utuado, Porto Rico, some showing the granules extending forward 

 to the second chin-shield. In one an accessory scale is interpolated between 

 the preparietals and in contact with the parietal. 



One from the Arecibo River near the 70-kilometer post, on June 14. 



One from a small settlement on the Rio Grande 2 miles from Arecibo, on 

 June 14. It shows two very large plates on the inner tibial surfaces. 



Among 13 examples from the Virgin Islands, one shows the prefrontals 

 separated by a small accessory scale, and another has the same scale and 

 frontal divided into three equal scales, two of which are in front as a pair; 3 

 more examples from the Virgin Islands show the occipital plates rounded and 

 subequal; one also shows an additional plate bordering the third and fourth 

 supralabials and interposed between the loreal, first subocular, and preocular. 



Ameiva wetmorei Stejneger. Frontispiece and Figure 6. 



Description. — Body elongate, rather slender. Tail long, conic. Head conic, 

 muzzle long. Eyehds granular. Teeth rather large, conic, in one row, and 

 becoming larger as they progress backward. Interorbital level. Ear about 

 size of eye, and tympanum not deep. Hind foot about two-thirds combined 

 length of head and trunk. 



Front nasal plates meet rather narrowly in contact on top of snout. Nos- 

 tril in suture between two nasals. Supraocular plates three, in contact with 

 prefrontal, frontal, fronto-parietal, and parietal. Fronto-parietals united as 

 a single plate before 3 large parietals, of which median is much narrowest. 

 Suboculars narrow, first two each half length of last. Loreal in contact 



