426 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



In the male the tympauum is uiuch larger than in the females, and 

 larger than the eye, extending to the posterior end of the jaw. In the 

 males the diameter of the tympanic disk is about 20'""\ reachiug 25'^ni 

 in large animals. In the female the diameter is abont ll°i™; but I have 

 observed a male with the diameter only 10™'" and a female with the 

 diameter as large as the average of males. Such cases are, however, 

 not very common. It may be observed here that the supposition, appar- 

 ently entertained by some writers, that the B. clamata possesses the 

 largest tympanic disk in the genus, is not correct, as it is as large in 

 the present species. 



The largest specimen of this species in the National Museum is the 

 No. 10880, from South Carolina. Its dimensions are as follows : 



Measurements Ko. 108SO. If. 



Length of head and hody 190 



Width of head at posterior edges tympanic disk 070 



Length of head to i^osterior edges tympanic disk 065 



Diameter of tympanic disk '. 025 



Length of fore leg from axilla 091 



Length of fore foot 040 



Length of hind leg from groin 238 



Length of tihia 074 



Length of tarsus 041 



Length of remainder of hind foot , 080 



Total expanse of palmation 080 . 



A large specimen from Pensacola has the head rather more elongated, 

 being longer than broad ; the tympauum normal. The palatine teeth 

 are in two patches, close together; the prominences of bone on which 

 they are situated are in contact at their bases ; the tongue broad, short, 

 and with long cornua. The skin is minutely shagreened above ; less so 

 beneath. The toes rather long. Body less blotched beneath, especially 

 on the abdomen. 



Measurements. 



Inches. 



Totallength 4.40 1.00 



Femur 2.10 .48 



Tibia 1.90 .43 



Tarsus 66 .15 



Hind foot 2.16 .49 



Inches. 



Totalhiudleg 6.70 1.52 



Arm from elbow 1. 80 .41 



Chord of upper jaw 1.72 .39 



Width of head 1.66 .33 



Most speciuiens from Carlisle, Pa., agree in general characters with 

 the one described, although one has the skin more pustular, with the 

 upper parts of an obscure ferruginous color, obsoletely varied with oli- 

 vaceous. The head, too, is decidedly longer than broad. Another 

 specimen, 4 inches in the length of body, with broad head, has the up- 

 per parts olivaceous green, with quite small indistinct blotches of pur- 

 plish-brown, not very close to each other. Young specimens generally 

 are of this color, the blotches reduced to distinct black dots, scattered 

 uniformly over the back, and the lower parts yellowish anteriorly, with 

 very obsolete indications of the blotches. Tympanum very large. The 

 R. conspersa Le Conte was based on such a specimen. 



