No. 6. — Report on the Dredging Operations off the West Coast 

 of Central America to the Galapagos, to the West Coast of 

 Mexico, and in the Gulf of California, in charge of Alexander 

 Agassiz, carried on hy the U. S. Fish Commission Steamer 

 "Albatross," during 1891, LiEUT. Commandek Z. L. Tannek, 

 U. S. N., ComTnanding. 



XXVIII. 



Description of two neto Lizards of the genus Anolis from Cocos and 

 Malpelo Islands. By Leonhard Stejnegbr. 



The two Anoles here described were the only reptiles obtained on the 

 isknds of Cocos and Malpelo during the expedition. Each species is 

 peculiar to the island upon which it is found. Of the two, the one from 

 Malpelo seems to be most highly specialized, there being no nearly 

 related species on the mainland with which I am familiar, while the 

 species from Cocos Island belongs to a group which has a numbei* of 

 representatives in Central America. The two species are only distantly 

 interrelated, inasmuch as they belong to widely separated sections of 

 the genus. 



It is quite possible that a more thorough search on Cocos Island 

 might reveal additional reptiles. In fact, Mr. Townsend informs me 

 that he saw a snake there which escaped. 



Anolis agassizi.i sp. nov. 



Diagnosis. — Tail cylindrical, without crest or keel; dorsal scales keeled, 

 subequal to those on the flanks, slightly smaller than the ventrals, and 

 separated froiu each other by one or more rows of minute granules ; 

 ventral scales keeled ; digital expansions very large ; about thirty-six trans- 

 verse lamellge under ii and iii phalanges of fourth toe ; occipital scale 

 about as large as ear-opening ; scales of supraorbital semicircles very much 

 enlarged (forming high, tuberculated crests in the adults), and separated by 

 one row of small scales; occipital separated from supraorbital semicircles by 

 <iue or two series of scales ; supraocular scales rough or rugose, sometimes 

 irregularly keeled ; canfbus rostralis sharp ; mental shield single, with a deep 

 sulcus posteriorly, very large ; tibia nearly equalling the head in length, and at 



1 Named in honor of Professor Alexander Agassiz. 



VOI„ XXXVI. NO. G. 



