170 ANNALS NEW YORK ACADEMY OF ^dENCES 



through the foam and with no central hollow. It was somewhat larger 

 than those previously observed, measuring 8 cm. in diameter. The eggs 

 are light yellow, and measure 2.5 mm. to 3 mm. in diameter. The small- 

 est tadpoles taken, swimming at large, measure 6 mm. in body length, 

 which probably represents their maximum size at the time they escape 

 from the foam. It is evident that the tadpoles usually will be washed 

 from the nest into the adjacent water by a flood or heavy rain. The 

 small nest isolated from water was probably a mistake on the part of the 

 frog, and the nest described by Stejneger under water probably had been 

 covered by a rise in the creek after the deposition of the eggs. The 

 largest larvae, nearly ready to transform, measure 13 mm. from snout to 

 vent. The V-shaped dorsal markings are already evident in the tadpoles 

 at this stage. The median dorsal white line is probably an adult char- 

 acter. 



Eleutherodactylus Dumeril and Bibron 

 Eleutherodactylus auriculatus (Cope) 



The following localities are represented by two hundred and seven 

 specimens in the collection : Adjuntas, Aibonito, Alto Manzano, Cataiio, 

 Coamo Springs, Jayuya, Maricao, Eio Piedras, .San Turce, Vega Baja, 

 and El Yunque. Eleutherodactylus auriculatus occurs in Santo Domingo 

 and Cuba as well as in Porto Rico, the type locality being Cuba. It ap- 

 pears to be rare in Cuba and Santo Domingo, while in Porto Rico it is 

 exceeded in abundance only by the ubiquitous Leptodactylus albilabr-is. 

 Its closest relative appears to be the E. martinicensis of the Lesser An- 

 tilles. 



E. auriculatus is remarkable for its color variation, with a compara- 

 tively stable structure, but a considerable variation in measurements. A 

 specimen in the collection of Prof. G. E. Johnson, of the University of 

 Porto Rico, collected by him in the Luquillo Forest, is remarkable for its 

 size, but it apparently is a giant individual of E. auriculatus. The maxi- 

 mum size in over three hundred specimens in the National Museum and 

 the present collection is 44 mm. from snout to vent, while Professor 

 Johnson's specimen measures 52 mm. Its measurements compared with 

 the largest in the present series are as follows: 



A. M. N. H. 

 No. 10241 Johnson coll. 



Tip of snout to vent 44 mm. 52 mm. 



Tip of snout to posterior edge of tympanum 18 " 20 " 



Greatest breadth of head 19 " 23 " 



Foreleg from axilla 29 " 35 " 



Hind leg from vent 69 " 80 " 



