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 by the U. S. Fish Commission Steamer 
“ Albatross,’ during 1891, Linut. COMMANDER Z. L. TANNER, 
U.S. N., Commanding. 
XXVIII. 
Description of two new Lizards of the genus Anolis from Cocos and 
Malpelo Islands. By LronnarD STEJNEGER. 
The two Anoles here described were the only reptiles obtained on the 
islands of Cocos and Malpelo during the expedition. ach 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 number 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,' 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 from each other by one or more rows of minnte granules ; 
ventral scales keeled ; digital expansions very large ; about thirty-six trans- 
verse lamellz under ii and ili 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 
one or two series of scales; supraocular scales rough or rugose, sometimes 
irregularly keeled ; canthus rostralis sharp; mental shield single, with a deep 
suleus posteriorly, very large ; tibia nearly equalling the head in length, and at 
1 Named in honor of Professor Alexander Agassiz. 
VOL. XXXVI. — NO. 6. 
