NATURAL SCIENCES OF PHILADELPHIA. 49 



nares widely separated. Tympanum round, equal one-fourth extent of orbit, 

 whose diameter equals length of muzzle from orbit. A slight web between 

 outer fingers, of which the second is shorter than the inner or first; one large 

 carpal tubercle, one on metacarpus of thumb. A dermal fold on the tarsus. 

 Two metatarsal tubercles. The carpu3 reaches the end of the muzzle, and the 

 heel the anterior border of the orbit. Length of head and body 3". 



Above brown ; a black band across end of muzzle and loreal region, through 

 eye to groin ; pale-bordered above on the muzzle, and interrupted by an oblique 

 white line from the femur. Femur dark posteriorly, tibia cross-banded ; (color 

 of limbs not well preserved.) Beneath pale, immaculate. 



ffabilat. Truando region, New Granada. Obtained by Arthur Schott, Esq., 



Of the U. S. Expedition under Lieut. Michler. 



Hylaplesia Boie. 



Hylaplesia truneata. 



Phyllobates truncatus Cope, Pr. A. N. S. Philada., 1860, p. 372. 



A certain serrulation of the alveolar ridge of the maxillary bone, in this and 

 the following species, greatly resembles dentition, and has caused their erro- 

 neous reference to Phyllobates, instead of Hylaplesia. 



This animal is most like the H. o b s c ur u s e Bum., Bibr., but has much 

 shorter posterior extremities. In both the anterior extremities equal the head 

 and body ; in the former they are more than half the length of the posterior, in 

 the latter, considerably less than half. In the t r u n c a t u s the first and second 

 fingers are equal ; their expansions are one-fourth the size of the tympinum. 

 The neural spines are very much dilated and thickened, especially that of the 

 axis. There is a transverse bony ridge on the occiput. 



Hylaplesia a u r a t a. 



Phyllobates auraius Girard, U. S. Astronomical Expedition, ii. p. 209. 



In this species the muzzle is rounded, and the first finger shorter than the 

 second, as in the H. t i n c tor i a. It has no occipital ridge, and the neural 

 spines are only slightly thickened. Dilatations of posterior extremities one- 

 fourth extent of tympanum ; of anterior, one-half the same. The ground 

 color is black or brown. Crown and muzzle surrounded by a golden band ; 

 two postscapular transverse annuli on each side, in contact on the median line ; 

 a yellow annulus on each inguinal region; smaller rings on humerus and tibia. 

 On pale specimens these markings are represented by refulgent bands which 

 are readily destroyed or passed over ; hence the imperfections of Girard's de- 

 scription. 



BUFONID.E. 



Rhaebo haematiticus Cope, Pr. A. N. S., 1862, p. 357. 



The genus Rhsebo is to be distinguished from Bufo by the presence of the 

 manubrium sterni, in addition to the characters given, 1. c, p. 358. I have had 

 opportunity of observing it in the present species and the R. leschenaultii. 

 This character has been denied to all Bufones in Stannius' "Handbuch der 

 Zootomie." I find it also in "Bufo simus Schm." 1. c, p. 357, which can 

 hardly be placed in Rhasbo. I cannot assign it to a new genus until the value 

 of its peculiarities is better known. 



The genus of Bufonida? for which I have adopted, in the above quoted article, 

 Fitzinger's name Chilophryne, is not alone characterized by the presence of a 

 parietal branch or continuation of the supraorbital ridge, as there indicated ; but 

 rather by the straightness of the latter, its not describing the usual arc of the 

 orbit, and its angle with the postorbital ridge, when the latter is present. 

 The parietal ridge sometimes exists in a rudimentary or fully developed con- 

 dition in Phryno'idis. P. sternosignatus e Gthr., illustrates the first case, 

 and P. d' o r b i g n y i the last. As the latter species is the type of Chilophryne 



1863.] 



