4. HTLA. 373 



B^pt. p. 71, pi. 21. f. 53 a ; Leconte, Proc. Ac. Philad. 1853, p. 428 ; 

 Wied, Nov. Act xxxii. p. 110. 

 Dendrohyas versicolor, Tsclmdi, Batr. p. 75. 



Tongue circular, slightly nicked, and free behind. Vomerine teeth 

 in two straight or slightly oblique groups on a level vrith the hinder 

 edge of the choanse. Head broader than long ; snout rounded, as 

 long as, or slightly longer than, the diameter of the orbit ; canthus 

 rostralis distinct ; loreal region slightly concave ; interorbital space 

 as broad as, or a little broader than, the upper eyelid ; tympanum 

 very distinct, about two thirds the diameter of the eye. Pingers 

 one-third, toes three-fourths webbed ; disks smaller than the tym- 

 panum ; subarticular tubercles moderate ; a very distinct fold along 

 the inner side of the tarsus. The hind limb being carried forwards 

 along the body, the tibio-tarsal articulation marks the tympanum 

 or the posterior corner of the eye. Upper surfaces with small 

 smooth warts, lower surfaces granulate; a strong fold across the 

 chest. Greyish or olive above, with irregular darker markings and 

 dark cross bars on the limbs ; sides of thighs yellow, with a black 

 network ; beneath immaculate. Male with a large, dark-coloured, 

 external subgular vocal sac. From snout to vent 53 millim. 



Eastern North America. 



J. Howell, Esq. [P.]. 

 Dr. J. Green [P.]. 



45. Hyla arenicolor. 



Hyla affinis, (mom Spix) Baird, Proc. Ac. Philad. vii. 1854, and U.S. 



Mex. Bound. 8m., Eept. p. 20, pi. 38. f. 4-7. 

 arenicolor, Cope, Journ. Ac. Philad. (2) vi. 180(3, p. 84. 



Tympanum two thirds the size of the eye. Fingers one-third 

 webbed. Tibia reaching more than halfway from vent to centre of 

 eye. ' Body rough. Colour ash-grey or green, with numerous 

 rounded dorsal blotches ; three transverse bands on each thigh and 

 leg ; no vermiculation on anterior and posterior faces of hind legs 

 nor on lower part of sides ; a light spot under the eye. From snout 

 to vent 45 millim. 



Northern Sonora. 



46. Hyla cadaverina. 



Hyla nebulosa, {nan Spix) Sallow. U.S.Ii. R. Surv. x., Williamson's 



Rep., Rept. p. 21, pi. 10. f. 2. 

 cadaverina, Co2}e, Jown, Ac. Philad. (2) vi. 1860, p. 84. 



Tongue subcircular, openly emarginate, and free behind. Vo- 

 merine teeth in two oblique groups between the choanse. General 



