Cope.] ^'56 [Sept. 16, 



ing to the base of the third phalange. In H. fasciatus Gthr. the web only 

 extends to the base of the second. 



Hypsiboas lanciformis, Cope. Sp. nov. 



This is a large species of the H. boans group. It is characterized by its 

 elongate acuminate head, with nearly straight, sharp canthus rostralis and 

 vertical conca;ve loreal region. Eyes prominent, large, their diameter 

 twice in length of muzzle, equal to interorbital width, and not quite twice 

 the diameter of the membranum tympani. A prominent dermal fold pro- 

 ceeds from it, overhanging the tympanum, to near the middle of the side; 

 its margin is roughly glandular. No dermal margins nor spurs on the 

 limbs. Fingers not webbed beyond the metacarpals ; reaching when the 

 limb is extended, to tlie hind face of the femur. Hind limbs very long, 

 the muzzle making the second third of the extended tibia. Web extend- 

 ing to the end of the second phalange of the fourth toe of the foot. Ostia 

 pharyngea small, one-fifth of the very large choanse. Tongue oval, longer 

 than wide. Vomerine teeth forming two angulate series, the two short 

 limbs of the angle uniting on the median line, without interruption. 

 Finger-dilatations large, not quite half the tympamun in diameter. 



Color, bright chestnut brown above and on the sides, shading into smoky 

 in the groin. The whole under surface a dark maroon. A black band 

 passes from the end of the muzzle, as wide as the loreal region, through 

 the eye and tympanum to along the axilla. Upper lip with a broad yellow 

 band, interi-upted on the premaxillary apex, and continued a short dis- 

 tance in front of the canthus oris on the mandible. No cross bars or 

 bands on the sides or limbs ; femur behind and before, smoky maroon. 

 A few irregular scattered dots on the back, and an indistinct series of 

 fourteen brown cross bands on the back and head. Dilatations of the 

 three inner fingers yellow above. I^ength, head and body, Om.087; of 

 hind limb .158m. ; of foot .067 ; of tarsus .033. Width of sacrum .016 ; 

 of head below posterior margin of tympana .028m. ; length (axial) from 

 same point .027. Length of fore limb .05m. 



This peculiar species resembles externally, a Polypedates. It need only 

 be compared to the Hypsiboas boans D. B. and H. oxyrhina E. and L. From 

 the former it differs in the entire absence of black or other colored bars on 

 the femora and flanks, in the darker coloration of the under surfaces, etc., 

 and the more elongate, lance-shaped head. Its thumb spur is much weaker 

 than in most species of the genus. From H. oxhyrhina it differs much in 

 coloration and in the longer hind limbs. Thus according to Reinhardt, and 

 Llitken in that species, the proportion of their length to the total is, .107m. 

 to .075m.; that is, 1.33 per cent. In H. lanciformis, the proportion is 1.81. 

 The white margins of the limbs, breast and lower lip as well as the marbled 

 coloration described by these authors; are here entirely wanting. Pebas, 

 Equador. J. Hauxwell's collection. 



DORYPHORUS CASTOR, Cope. Sp. TIOV. 



Scales of the abdomen weakly keeled, nearly equal to those of the back, 

 which are more strongly keeled. Scales of the sides scarcely smaller than 



