NATL'RAL SCIENCES OF PHILADELPHIA. 137 



may be said of the large prefrontals. Frontal hexagonal, scarcely longer than 

 broad, with strongly convergent sides. Occipitals narrowed, emarginate be- 

 hind. Temporals 1 | 2 | 2, the anterior not large, in contact with both post- 

 oculars and fifth and sixth upper labials. Seventh labial bounded by two. 

 The five anterior labials are higher than long, the two others a little longer 

 than high, third and fourth entering orbit. Loreal longer than high. Eight 

 inferior labials, fifth with greater transverse than longitudinal diameter. 



Gastrosteges 159; anal 1 ; urosteges 41. 



Color above a rich yellow-brown, with a series of black spots on the dorsal 

 region, which are longer anteriorly, but separated by nearly equal spaces of 

 1-5 to 2 scales; length of third spot 7-5, scales of tenth, three scales. Behind 

 the third spot the lateral portions are separated and sometimes divided, and 

 extend to the ends of the scuta. Below nearly unspotted, except on tail. 

 Gular region also immaculate. Head above thickly dusted with brown, paler 

 on nape and top of muzzle. A pair of deep brown, yellow-edged spots on 

 each occipital plate, converging behind ; labials brown-dusted. 



This is one of the most handsomely colored of the species, and of aberrant 

 form. 



From the Northern part of the Paraguay river. 



Leptognathus fasciata Cope. Tropidodipsas fasciata Giinther, Catal. Snakes 

 Brit. Mus., 1858. 

 From Mexico. 



Leptognathus sartorii Cope. Tropidodipsas do. Cope, Proc. Acad. Nat. Sci. 

 1863, 100. 

 Vera Cruz, Mexico. 



BATRACHIA. 



Prostherapis ingdinalis Cope, genus et species novae Colostethidarum. 



Char. ymer. — Xiphisternum membranous (difficult to discover), manubrium 

 a bony style, with cartilage disc ; metatarsus slightly webbed, dilatations 

 strong, each with two dermal scales on the upper side, separated by a fissure ; 

 terminal phalanges small, T-shaped ; tongue cylindric, free ; no vomerine 

 teeth ; belly not areolate. Pupils longitudinal. Ethmoid well developed an- 

 teriorly, the prefrontals lateral, well separated. 



This genus is interesting, as constituting the second of the little known 

 family of the Colostethidae, which was established by the writer in 1867. Its 

 general appearance is that of a Phyllobates, and it is related to Colostethus 

 much as Limnocharis is to the firet-named. The two leathery scales of the 

 pallettes are peculiar, and resemble those of the under side in Phyllodactylus. 

 The distal phalanges are short, and extend very little into the dilatation. 



Char, specif. — Muzzle and canthus rostralis angulated, the former project- 

 ing, rounded, truncate from above ; the loreal legion nearly vertical. Nostril 

 nearly terminal, eye large, its long diameter equal to near end of muzzle. 

 Membrana tympani concealed. Skin everywhere smooth, a weak fold on the 

 distal half the tarsus. Free portions of the metatarsi only webbed, all the 

 toes with strong dermal margin ; the fingers with a weaker one. Digital di- 

 latations extended rather transversely ; two metatarsal tubercles, both small, 

 inner elongate. Inner nares almost lateral, ostia pharyngea small, half the 

 size of the former. 



Width head and jaws one-third length to end coccyx, and equal length head 

 to opposite usual position of posterior margin tympanum. Heel to middle 

 of orbit, wrist to beyond end muzzle. 



Lin. 



Length head and body 12-5 



" fore limb 8 



" hind limb 18-5 



" foot without tarsus 56 



1868.] 10 



