352 BULLETIN 34, UNITED STATES NATIONAL MUSET^M. 



Upper lip and side with a narrow, poorly defined yellow line ; thigh iinicolor 

 behind; small; head rounded II. squirella. 



Larger; head short, rounded; upper lip uni color ; a plum-colored lateral 

 band not defined below ; sides and thigh behind spotted with yellow 



H. andersonil. 



aoc. Two phalanges of fourth toe free. 



Slender ; head acuminate ; a yellow band on upper lip and on side well de- 

 fined above and below ; thigh unspotted behind H. earolinensis. 



Eobust ; head rounded ; no band on upper lips, nor spots on thigh behind 



, H. arenicolor. 



III. External fingers shortly palmate ; vomerine fascicles between nares. 

 a. Dorsal integument not closely areolate. 



Three phalanges of fourth toe free ; skin above smooth ; upper lip unicolor ; 

 thigh behind dark brown with yellow spots H. femoralls. 



Two phalanges of fourth toe free ; dorsal integument with small tubercles ; 

 upper lip spotted ; thigh yellow, with coarse netting of darker color 



posteriorly H. versicolor. 



aa. Dorsal integument with a close areolation like tbat of the belly. 



Two phalanges of fourth toe free ; dorsal areolae more minute than those of 

 belly ; upper lip with yellow edge ; thigh behind unspotted.^, giatiosa. 



The ]liJ"orth American species of this genus are easy to distinguish, 

 since they are well defined. The only one which presents much varia- 

 tion in characters is the R. regilla. A species was named and figured 

 by Professor Holbrook as the E. delitescens. Other authors have not 

 recognized this tree frog, and it remains uncertain whether it was not 

 founded on immature specimens of the H. versicolor. 



The damp southeastern part of the continent naturally possesses the 

 greater number of species of this genus. 



HYLA PICKEEINGII Storer. 

 (Plate 78.) 



Eylodes pickeringii Storer, Mass. Kept. (1839), 240; Holbrook, N. Amer. Herp., 2d 



ed., IV (1842), 135, xxxiv ; De Kay, N. Y. ZooL, in, Reptil. (1842), 69 xx, 5i; 



Thompson, Nat. Hist. Vt. (1842), 121. 

 Hyla femoralis Nichols, Journ. Essex Co. Nat. Hist. Soc, i (June, 1839), 96 (Dau- 



vers, Mass.). 

 JSyla crucifer Max. Von Wied., Reise in das inn. Nord-Amerika, i (1839), 249. 

 Acris de Pickering Aug. Dum6ril, Ann. des Sc. Nat., 3™^ ggrje, xix (1853), 153. 

 Acris pickeringii Giiuther, Cat. Batr. Sal. Brit. Mus., 1868, p. 71. 

 Hyla pickeringii Le Conte, Proceed. Ac. Phila, 1854, p. vii, p. 429; Cope, Check-List 



Batr., Reptil., N. Amer., p. 31, 1875; Boulenger, Cat. Batr. Sal. Brit. Mus., 1882, 



p. 399. 



Body sparsely pustular above ; closely granulated on whole lower 

 parts. Tibia not half the length of body, longer than hind foot, longer 

 than arm from elbow. Above, ash-gray to wood-brown, with a well-de- 

 fined narrow-lined X or Saint Andrew's cross on the back; a /\-shaped 

 mark behind the cross and a short line on each side, with their direction 

 parallel to the posterior of the X angle ; another similar mark between 



