1885.] - JO [Cope. 



Batrachia. 

 Hyla favosa, sp. nov. 



The internal nares are about as large as the choanal, and are a little 

 longer than wide. The patches of vomerine teeth are between them, 

 opposite a point anterior to their middle. The head is short and wide, and 

 the canthus rostralis is rounded and concave. The muzzle is truncate 

 viewed in profile, and the nostrils, though opening laterally, are terminal 

 in position. The tympanum is small, being one-half the long diameter of 

 the eye-slit, or a little less than half that of the eyeball. It is a little 

 larger than the digital palettes of the anterior foot. On all the upper sur- 

 faces the skin is smooth.. The usual areolation covers the abdomen and 

 part of the femora. The three external fingers are about half webbed, 

 the web not reaching the palettes of the third and fifth digits. The toes 

 are more than half webbed, the membrane reaching the dilatations of all 

 the toes except the fourth, where it reaches the base of the penultimate 

 phalange. When the posterior limb is extended, the heel reaches the 

 front border of the orbit. The upper arm is bound to the side for the 

 greater part of its length by a strong extension of the skin. A trace only 

 is seen at the anterior base of the femur. 



one and the P. plicatilis Linn., and two ringed species, the P. martii Spix and P. 

 callostictus Gthr. The P. mimeticus has a remarkable resemblance to the 'Hydro- 

 calamus guinguevittatus (D. & B.) Cope, Proceeds. Amer. Philos. Soc, 1884, p. 176. 

 The scuta of the head are as in the P. plicatilis. Dorsal region brown for a width 

 of five and two half rows of scales. Sides, on the third and fourth and half of the 

 second and fifth rows, marked with a black band, which extends from the 

 orbit to end of the tail, and is yellow-bordered above. Below yellow with two 

 small brown spots on each gastrostege and one on each urostege. Lips black, 

 yellow spotted ; a yellow band from eye to angleof mouth. Afewsmall blackish 

 spots on top of muzzle. Gastrosteges 163 ; anal 1-1; urosteges35. Total length 

 M. .490 ; of tail .056. 3. Liophis almadensis Wagl. 4. Herpetodryas fuscits Linn. 

 5. Xencdon biprceoculis, sp. nov. Body much compressed, and scales in nine- 

 teen longitudinal rows, and scarcely alternating. Anal plate entire. Eye large, 

 profile convex. Superior labials eight, fourth and fifth entering orbit; seventh 

 very wide above. Oculars 2-2, the anterior narrow, permitting the posterior 

 angle of the large loreal to almost reach the orbit. Temporals 1-5; the anterior 

 asdeepaslong. Bothinternasalsandprefrontalsalittle widerthan long. Frontal- 

 large, wide in front, longer than common suture of parietals. Parietals as wide 

 as long. Ten inferior labials, the sixth much the largest. Geneials very short, 

 the anterior a little the longer. Gastrosteges, 136; urosteges, 44. Color above 

 olivaceous with three rows of equidistant spots. These are composed of coarse, 

 black punctulations, and are without definite outline. Every third spot of the 

 median line is in the centre of a pale ground, while the pairs between are con- 

 nected by a dark shade. Inferior surfaces yellow; every other, or every second 

 gastrostege, with a blackish edging at each end. Top of head olive, with black 

 punctulations symmetrically arranged, so as to leave a curved unspotted space 

 between /the orbits and on the external border of the parietals. Labial plates 

 unspotted. A very narrowblack line from eye to superior border of last labial. 

 Total length M. .590; of tail, .101. From its compressed form and natural coil, 

 this species might be supposed to have arboreal habits. It agrees with three 

 other species in its entire anal plate ; vis., X, suspectus Cope ; X. colubrinus Gunth ; 

 and X. anguslirostris Pet. In X. rhabdocephalus Boie, I find the anal plate entire 

 or divided. 6. Elaps surinamensis Cuv. 



