1906.] NATURAL SCIENCES OF PHILADELPHIA. 109 



lurk about the rocks or sea-wrack, and their protective colors make it 

 difficult to distinguish them when quiet or not moving about. 



AMPHIBIANS. 



BUFONID^. 



87. Bufo quericus Holbrook. 



In Hfe plumbeous-gray, markings dusky slate-color. Lower surface 

 of body translucent whitish. Soles of feet and toes brownish. Iris 

 with yellowish next to pupil. 



Abundant in the open grass-land on Big Pine Key. They progress 

 by a series of short jumps. 



HYLID^. 



88. Hyla squirella Daudin. 



In life plumbeous above speckled wdth dull brownish. A blackish- 

 brown line from tip of snout along side of head and including eye in 

 its course. Lower surface of body pale brownish-white. Legs pale 

 translucent brown, whitish below and posterior feet dusky. Iris 

 brown. 



This species was found on the ground about shady hammock-land 

 on Boca Chica Key. I also saw one on a Gumbo Limbo tree on Vaca 

 Key. 



89. Hyla carolinensis (Pennant). 



A small green frog, evidently this species, was seen on Key West and 

 Boca Chica Key. 



REPTILES. 

 COLUBRID^. 



90. Natrix fasciata (Linntens). Moccasin. 



One example was taken in the mangroves of Boca Grande Key. 

 Here they live in the pools among the roots and short sprouts, and are 

 thus difficult to see on account of the seclusion afforded. I did not 

 meet with it in any other locality, though it doubtless occm-s as it 

 was reported from No Name Key. The vernacular is ''Moccasin," 

 as distinguished from the "Cotton Mouth Moccasin" (Agkistrodon 

 contortrix). 



91. Bascanion constrictor (Linnaus). Black Snake. 



Reported from No Name Key. Seen on Knight and Summerland 

 Keys. 



