150 ENaTSIOMATID*. 



Habit slender ; tibio-tarsal articulation not 



reaoMng beyond the posterior corner of 



the eye ; skin smooth 5. varius, p. 152. 



Habit slender ; tibio-tarsal articulation 



marking the front of the orbit 6. longirostris, p. 153. 



Habit slender J tibio-tarsal articulation 



marking the eye ; toes half webbed ; skin 



warty 9. erwiger, p. 154. 



Habit slender; tibio-tarsal articulation 



marking the eye ; toes nearly entirely 



webbed ; skin smooth 10. elegans, p. 155. 



Habit very slender ; tibio-tarsal articulation 



reaching beyond the eye ; toes half 



webbed; skin smooth 11. hibronii, p. 155. 



II. First toe quite indistinct. 

 Head as broad as long ; yellow and brown 



above 7. Jlavescens, p. 153. 



Head a little longer than broad ; black and 



green above 8. pulcher, p. 154. 



1. Phryniscus nigricans. 



Phrynisous nigricans, Oiinth. Cat. p. 43. 

 Phryniscus niericans, Wiegm. Nov. Act. 1834, p. 264; Ihim. ^ Bibr. 



p. 723; BeU, Zool. Beagle, p. 49, pi. 20. f. 3-5; D'Orhigny, Voy. 



Am^r. m4r., Kept. p. 11, pi. 15. f. 1-4; Hspada, Viaj. Pacif., Vert. 



p. 115, pi. 1. f. 9. 

 Chaunus lormosus, Tschudi, Batr. p. 87. 

 ? Phryniscus guttatus, PMl^pi, Arch.f. Naturg, 1861, p. 300. 



Habit stout. Head broader than long; snout short, rounded; 

 interorbital space broader than the upper eyelid. Fore limb shorter 

 than the trunk ; fingers short, first a little shorter than second ; 

 metacarpal and subarticular tubercles well developed. Hind limb 

 short, the tibio-tarsal articulation reaching hardly the shoulder; 

 toes short, one-third webbed, with prominent double subarticular 

 tubercles ; two metatarsal tubercles. Upper surfaces covered with 

 warts. Black, variously spotted with white. Male with a subgular 

 vocal sac. 



Uruguay, Buenos Ayres. 



C. Darwin, Esq. [P.]. 



B. White [0.1. 

 Sir A. Smith {P.]. 



2. Phryniscus proboscideus. (Piate XIII. fig. 1.) 



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

 and a half or twice and one fourth in the length of the trunk; 

 snout much produced beyond the Hp, truncate ; loreal region con- 

 cave ; nostril near the tip of the snout ; the diameter of the eye 

 equals its distance from the nostril; interorbital space a little 



