298 [November, 



Genus STERNA. 



Sterna dougallii. The Roseate Tern. 

 I do not recollect to have seen but a single individual of this species. 



Sterna arctica. Black-capped Tern. 



I have seen several flocks of these birds, generally in the month of June, 

 during freshets and storms. 



Genus LARUS. 

 Larus lecooptbrus, Aud. (?) "White-winged Gull. 

 Very common along the river during the winter. Besides this, there are several 

 other species of Gull occasionally seen passing through the country. 



On a new and remarkable genus of Ranidce, from the river Parana. 

 By Edw. Hallowell, M. D, 



Gen. TRIGONOPHRYS. 



Char. Head very large, depressed ; upper eyelid triangular ; tongue large , 

 subcircular, notched in front and posteriorly, more deeply behind, attached in 

 front, free laterally and in its posterior half; upper maxillary teeth large, conical, 

 recurved, sharp-pointed ; two groups of vomerine teeth on a line with the ante- 

 rior margin of the posterior nares, nearer to them than to each other ; posterior 

 nares large, subcircular ; eustachian foramina of moderate size, rather large ; 

 no vocal vesicles either internal or external ; tympanum indistinct ; four fingers 

 completely free ; toes palmate at their base only ; first cuneiform bone present- 

 ing a i^rominence externally, with a well defined projecting edge ; transverse 

 processes of the sacral vertebrce not dilated. 



Trigonophrys rugioeps, nob. 



Char. Body thick and stout, more or less covered with tubercles above ; two 

 movable bucklers beneath the skin, posterior to the occiput ; two glands upon 

 the upper surface of each thigh near the groin ; two others larger upon the 

 breast ; ground color of body and sides olive, presenting numerous dark colored, 

 ovoid spots, with a narrow margin of white, the interspaces in the immature 

 specimens of a beautiful rose color ; extremities olive, with large and broad 

 bands of black margined with white, the interspaces more or less tinged 

 with red ; under parts white mingled with yellow ; chin and throat black spotted. 



Dimensions. Length of head 1 inch 4 lines ; greatest breadth 2 inches 3 J lines ; 

 breadth of bucklers 1 inch "7 J lines ; length of body 3 inches ; breadth 3 inches 

 2 lines; length of anterior extremities 2k inches; of posterior extremities 4 

 inches. 



Gen. Remarks. A more detailed description with drawings, and an account 

 of the anatomy, will be given in the next volume of the Journal. It diifers from 

 Ceratophrys, to which it is closely allied, in the shape of the eyelids, the form 

 of the body, the structure of the skull, and the teeth, which are remarkable for 

 their great development. 



ELECTION. 



Mr. Frederick Gr. Hesse, of Washington, and Drs. Geo. J. Ziegler 

 and John H. Packard, of Philadelphia, were elected Members; and 

 Philip Lutley Sclater, M. A., of London, and the Right Revd. Stephen 

 Elliott, Bishop of Georgia, were elected Correspondents of the Academy. 



