150 ENGYSIOMATID^. 



Habit slender ; tibio-tarsal articulation not 



reacMng 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. longirostrh, p. 153. 



Habit slender ; tibio-tarsal articulation 



marking the eye ; toes half webbed ; skin 



warty 9. entcif/er, p. 154. 



Habit slender ; tibio-tarsal articulation 



marking the eye ; toes nearly entirely 



Avebbed ; skin smooth 10. eler/ans, p. 155. 



Habit very slender ; tibio-tarsal articulation 



reaching beyond the eye; toes half 



webbed .: skin smooth 11. hihronii, p. 155. 



II. First toe quite indistinct. 

 Head as broad as long ; yellow and brown 



above 7. Jlavcscens, p. 153. 



Head a little longer than broad ; black and 



green above 8. piilchcr, p. 154. 



1. Phryniscus nigricans. 



Phryiiiscus nigricans, Giinth. Cat, p. 43. 

 Pliiyniscus nisTicans, Wicym. Nov. Act. 1834, p. 204; Dum. 9- Bihr. 



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



Amer. mcr., liept. p. 11, pi. lo. f. 1-4; Espacla, Viaj. Pacif., Vert, 



p. llo, pL l.f.O. 

 Chaunus formosus, Tschudi, Batr. p. 87. 

 ? Phryniscus guttatus, Philippi, Arch.f. Natury. 1861, p. 300. 



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

 interorbital space broader than the upper eyelid. Pore 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. 



a-c. c? $ . Maldonado. C. Darwin, Esq. [P.j. 



d. (S . Montevideo. 



c. 5 . Buenos Ayres. E. White [C.]. 



/. 5 . S. America. Sir A. Smith [P.]. 



2. Phryniscus proboscideus. (Plate 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 lip, truncate ; lorcal region con- 

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

 equals its distance from the nostril; interorbital space a little 



