1913.] • NATURAL SCIENCES OF PHILADELPHIA. 169 



AMBLYOEPHALID^. 

 Leptognathus ellipsifera Boulenger. 

 One, same data as last. 



Leptognathus andianus Boulenger. 



Two, also same data as preceding. 



CROTALID^. 



Lachesis schlegelii (Berthold). 



One, same data as preceding. 



Lachesis microphthalmus Cope. 



Two examples, and one head. These from Dr. Aleitzner, and 

 with same data as last. 



GECKONID^. 



Gonatodes caudiscutatus (Gunther). 



Two, secured in July, 1911, by Mr. Rhoads, at Bucay. They were 

 found living in crevices of porches of the second story of houses. 

 They were seen to come out on the screen, about a foot or so from 

 their retreat. Their movements were slow and sluggish, and they 

 darted suddenly, for a short distance only. 



IGUANID^. 



Anolis gemmosus O'Shaughnessy. 



Two from Bucay, in July, 1911, secured by Mr. Rhoads. 



Basiliscus galeritus A. Dumdril. 



Mr. Rhoads secured two from the camp at the junction of the 

 Rio Chiguancay and Rio Chanchan in March, 1911, and three more 

 at Bucay in July, 1911. 



According to Mr. Rhoads, it is a most interesting species. It was 

 found frequenting the banks of running streams, where they would 

 sit on the rocks in the open sunshine. These rocks were always 

 near the edge of the water. When disturbed, the lizards would 

 suddenly dart across the intervening running water to the next rock 

 or boulder, and then turn their heads around and look at the intruder 

 in a most apish fashion. In crossing the surface of the water their 

 feet and tails would move so rapidly that no portion of the animal 

 appeared submerged. Often the fore part of the body was raised 

 an inch or more above the surface. Frequently the lizards would 

 cross very turbulent water. When chased from rock to rock, they 

 would finally attempt to cross even wide torrents, and are able by 

 the great speed of their movements to go as far as thirty or forty feet 



