2. THRYNISCUS. 153 



tubercles. Hind limb moderate ; the tibio-tarsal articulation marks 

 the posterior corner of the ejo in males, does not reach so far in 

 females ; toes rather short, first very short but distinct, nearly 

 entirely •webbed ; no metatarsal nor subarticular tubercles. Skin 

 quite smooth. Two varieties of colour may be distinguished : in 

 both the ujipcr surfaces are Ijlack and the lower surfaces yellow ; in 

 the first variety the markings of the upper surfaces arc crimson, in 

 the other they are greenish yellow ; these markings very variable, 

 arranged in spots or in confluent symmetrical bands. Males (pro- 

 bably of the second variety) greyish above dotted with black, the 

 light markings black-edged ; an internal snbgular vocal sac. 

 C. America ; Colombia. 



n-b. 2 , var. 2. Costa Rica. Prof. Peters. 



c. Many spec, (botli va- Costa Rica. Messrs. Sahiu and Godman 



pieties): cS , $, & bgr. [P.]. 



d-e. 2 , var. 1. Costa Rica. 0. Salvin, Esq. [C.l. 



/-/;, {-/. d 2 , var. 2. Co^ta Rica. 



6. Piiij i m-itiu longirostris. 



Atelopus lougirostris, Cope, Prnc. Acad.rhilad. 18G8, p. 116; Espada, 



Viuj. racif., Vert. p. 15-5, pi. 2. f. 1 & 2. 

 variu8, BonleiKj. Bull. >ioc. Zool. France, 1880, p. 4G. 



Ycry closely allied to P. varius, from which it diilers in the 

 longer, more pointed, and more prominent snout, and the longer hind 

 limb, the tibio-tarsal articulation marking the front of the eye. 

 Above black ; under surfaces and upper lip yellow ; a greenish spot 

 on each scapular region, and two or three pairs of the same on each 

 side of the vertebral line. 



7. ghryitigcuB' flavescens. 



Atelopus flavescens, Gilnth. Cat. p. 48. 

 Atelopus flavescens, Dum. 8)- Bihr. p. GOl. 

 spumarius, Cojk, Proc. Ac. PMlad. 1871, p. 222. 



Habit slender. Head as broad as long, its length contained about 

 twice and a half in females, scarcely more than twice in males, in 

 the length of the trunk ; sides of head vertical ; snout subacuminate, 

 projecting : nostril much nearer the tip of the snout than the eye ; 

 the diameter of the latter equals its distance from the nostril ; 

 interorbital space broader than the upper eyelid (as broad as the 

 upper eyelid in one, male, specimen). Fore limb slender, a little 

 longer than the trunk ; fingers moderate, first very short, rudimen- 

 tary ; no metacarpal nor subarticixlar tubercles. Hind limb rather 

 slender, the tibio-tarsal articulation marks the posterior corner of 

 the eye ; toes short, first quite indistinct, one-third webbed ; no 

 metatarsal nor subarticular tubercles. 8kin quite smooth. Bright 

 yellow ; upper surfaces dotted and marbled with brown or blackish ; 



