NATURAL SCIENCES OF PHILADELPHIA. 355 



cantlius rostralis obtuse. Palettes of the fingers nearly as large as tympa- 

 num ; digits slightly webbed ; two phalanges of fourth toe free. Heel 

 reaches to orbit when the leg is extended. No vocal pouch in the specimen 

 (5837) examined. From angle to angle of mouth beneath, 1 in. 3 lin. ; from 

 symphysis to postgular fold 6 1. ; muzzle to vent 3 in. 3 lin. ; posterior 

 extremity 5 in. 6 1. ; anterior do. 1 in. 7 lin. 



Above leathery brown, with deep brown shades on the back, and cross-bands 

 on the limbs. Sides and posterior faces of femora reticulated with the same, 

 enclosing on the former, yellowish areas. Beneath yellowish brown. 



Phyllomedusa a z u r e a Cope. 



Muzzle short, elevated, truncate ; canthus rostralis rounded, a little concave. 

 External nares entirely lateral. Supra-palpebral region not prominent, the 

 visual fissure rather restricted. Tympanic disc near the posterior canthus of 

 the latter, equalling less than half its extent. Skin of the superior regions 

 smooth ; a narrow median band of areolations on the inferior surface of the 

 femur. Paratoids very slightly developed. Anterior limbs extended pos- 

 teriorly, reaching hinder side of femur. Heel about reaching tympanic disc. 

 Internal nares anterior, smaller than the eustachian orifices. An acute me- 

 dian emargination in the premaxillary region. Two external of the anterior 

 digits, longest, nearly equal, their basal phalanges, united by the integument : 

 thumb shortest, almost opposable. Soles slightly tuberculous. Length of 

 head and body one inch six lines ; from end of muzzle to tympanum four lines; 

 length of antebrachium 4-5 lines ; of tibia 7 lines ; of tarsus 5*5 lines ; meta- 

 tarsus and longest digit 5 lines. 



Color of the upper surfaces of the body and extremities, except that of the 

 brachium, milky purplish blue. Beneath white or yellowish. The edges of the 

 jaws are margined with the same, which margins form a narrow, lateral band, 

 which extends to the middle of the side. Posterior lateral region, with the 

 white surfaces of the extremities, with vertical blackish-brown bands. The 

 blue is reduced to a narrow band on the femur ; it is margined with white on 

 the anterior extremity and the tarsus. No. 5832. 



I cannot find a trace of vomerine teeth in the two specimens at my disposal. 

 Their absence may be accidental ; perhaps it is a specific character its import- 

 ance is not greater than this. 



This species differs from P. hy pochond rialis of Surinam (ffy/ct hyp. 

 Daud.) in its smaller and relatively less depressed head, shorter hinder extre- 

 mities, and absence of dark spots upon the anterior lateral region. 



The hypochondrialis is believed by Prof. Schlegel, (Abbild. Amph., 

 Dec. i., p. 24,) to be the young of b i c o 1 o r. The same statement is made by 

 Dr. Tschudi, (Classif. der Batrachier, p. 27,) and by Dumeril and Bibron. 

 Drs. Burmeister and Giinther apparently acquiesce in this opinion. There are 

 no reasons to doubt the correctness of this view, other than such as a consider- 

 ation of the following differences may furnish. The hypochondrialis 

 \s apparently destitute of the lateral, extremital, and gular yellow spots of the 

 b i c o 1 o r ; on the contrary, the color of the back has a straight outline, and is 

 distinctly defined upon the sides. The superior labial yellow border is not 

 seen in the b i c o 1 o r, nor is the bright color of the upper surfaces wanting 

 upon the humerus, as inazureus and hypochondrialis. 



II. The Darien Collection. 



The objects and direction of the expedition to which we are indebted for the 

 collection below catalogued, have been explained briefly by Mr. John Cassin, 

 the well-known ornithologist, in these Proceedings.* He has also stated the 

 positions of the localities at which portions of the collection were made. 

 Thirty-two species of reptiles were obtained, of which thirteen were new to 



* 1860, p. 132. 



1862.] 



