156 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



of choanae; front o-parietal bones separated by large fon- 

 tanelle covered by cartilaginous roof; tympanum usually 

 one-third or less, and at most one-half the diameter of the 

 eye, and overhung by a dermal fold; fingers one-fourth to 

 one-half webbed (fig. 19, d); the hind limb being carried for- 

 ward along the body, the tibio-tarsal joint reaches beyond the 

 eye and at the most to the end of the snout; toes four-fifths 

 webbed, the membrane reaching the disks of the third and 

 fifth toes, but leaving free the last phalanx of the fourth; 

 subarticular and supernumerary tubercles extended backward 

 upon metatarsals; a tarsal fold; tongue notched behind; 

 canthus rostralis distinct, short; loreal region oblique, con- 

 cave; skin of upperparts smooth; under surfaces of thighs, 

 underparts, and gular region coarsely granulated; dermal 

 fold across chest present or absent; upper surfaces purplish 

 ash (? green in life) or pale olive brown, with or without a 

 few lighter specks, indistinct darker reticulations, or black 

 spots; limbs paler, not crossbarred; a light external stripe 

 from elbow and heel to digits; superior labial border and 

 lateral stripe occasionally bright yellow, there being no 

 abrupt demarcation between the latter and the abdomen in 

 some cases; anal spot with light superior border; under 



surfaces yellow; head-and-body length, 35 to 40 mm 



raiotympanura (p. 170) 



Adhesive disks of fingers larger than those of toes, and nearly 

 as large as tympanum; vomerine teeth in oblique rows 

 between and extending back to level of hinder edge of 

 choanae; tympanum less than or slightly more than one- 

 half the diameter of the eye; fingers one-fourth webbed; 

 the hind limb being carried forward along the body, the tibio- 

 tarsal joint reaches to center of the eye; toes two-thirds 

 webbed, the membrane reaching the disks of the third and 

 fifth toes, but leaving free the last phalanx of the fourth; 

 a tarsal fold; tongue oval, not notched behind; canthus 

 rostralis rounded; loreal region oblique; skin of upperparts 

 smooth; underparts granulated; no dermal fold across chest; 

 upper surfaces light purplish, with or without darker mar- 

 bling; no post-tympanic black mark; sides with a network 

 of blackish brown spots or blotches on creamy white back- 

 ground; hind limbs with indistinct dark cross bands; under- 

 parts white, with scattered black specks on throat and 

 anterior part of abdomen, concealed parts unpigmented, 

 white; head-and-body length, 30 mm taeniopus (p. 175) 



HYLA ARENICOLOR Cope 



CaSon Tree Toad 



Figure, 20, e 



1864. Hyla affinis Baird, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, p. 61, Apr. 

 (preoccupied by Hyla affinis Spix, 1824). — Baird, 1859, Report on the United 

 States and Mexican Boundarj' Survey, vol. 2, Reptiles, p. 29, pi. 38, figs. 

 4-7. 



