Hurter — Herpetology of Missouri. 103 



22. Chorophilus triseriatus Wied. Three-striped Tree 

 Frog. 



Hyla triseriata, Helocoetes triseriatus, Hylodes maculatus, Chorophilus 

 septentrionalis, Chorophilus nigriius. 



Description. — In general appearance this species is of an elongate 

 form. Head longer than broad. Upper jaw rather pointed, projecting 

 over the lower. Tongue elongate, slightly notched, and free behind 

 for about one-third of its length. Tympanum circular in outline, about 

 half the longitudinal diameter of the eye. Vomerine teeth between the 

 choanae. Femur and tibia nearly of the same length. Palm with 

 numerous rounded tubercles. Two small plantar tubercles. Basal part 

 of outer toes bound together by the integument. Small webs between 

 all the toes. First finger of males greatly swollen at base. Skin of 

 throat greatly distended in males and thrown into longitudinal folds 

 when the vocal sac is at rest. Dorsal surface finely, ventral surface 

 coarsely, granulate. Upper surface of head, limbs, excepting the 

 femora and in the males the throat, smooth. 



Color. — Above yellowish green to ash-gray or dull black, with spots 

 and longitudinal stripes of brown or black. Below whitish, sometimes 

 with brown specks on the sides and belly. The upper jaw is margined 

 by a dark stripe, which is widest in front and becomes gradually 

 narrower on each side to the angle of the mouth. Above this stripe 

 is another pale one which passes just beneath the eye and extends 

 backward, between the angle of the mouth and the tympanum, to the 

 base of the fore leg on each side. Both these bands are continuous 

 around the snout. Above the pale stripe are dark bands, one on each 

 side, which include the nostrils, rapidly widen to the eyes, and are 

 continued behind them to or beyond the middle of the sides. Two 

 other bands begin behind the eye, extend along the sides of the back, 

 and terminate a short distance above and in front of the femora. A 

 median dorsal band begins on the snout, expands abruptly between 

 the eyes, and terminates at about two-thirds the distance from the 

 snout to the posterior end of the body. At its posterior termination 

 lie two short stripes, one on each side of the middle line, reaching 

 back toward the end of the body. Legs colored like the back above, 

 with dark spots; pale below. Sometimes the color of the whole back 

 is a sooty black, and the stripes and spots only faintly indicated. 

 (Garman.) 



Size. — Female, length of body 33 mm.; from tip of snout to axilla 

 11 mm. Femur 12 mm.; tibia 13 mm. Tarsus and fourth toe together 

 20 mm. 



Habitat. — It is reported from New Jersey to Montana, 

 south to Arizona (Flagstaff, Hurter), New Mexico, Okla- 



