Cope.] 1^^ [Jnlyie, 



form a deep pocket extending more than half way to the tympanum, and 

 with some subdividing folds. No auricular scales different fi'om the 

 temporal ; all strongly keeled. 



Two pairs of supvanasals, two pairs frontonasals separated by a small 

 internasal. Frontal divided transversely and longitudinally ; frontoparie- 

 tals small. Parietals small, transversely divided ; interparietal large, 

 broader than long. Supraorbitals four on each side, preceded by three 

 scales, and bounded inwardly and outwardly by much smaller scales- 

 None striate ; those on muzzle weakly one keeled. 



In- Lin. 



Total length G 8.2 



Length to vent 2 1.4 



" to axilla 10.2 



" to canthus oris 5.3 



" hind limb 1 8.4 



" " foot 10.1 



" fore limb 10.6 



Width head 4.8 



This species is comparable to S. oligoporus, Cope, in the large scales 

 and few femoral pores, but differs much in the division of the frontal 

 plate, large interparietal and cervical pocket. It is considerably smaller 

 and of different coloration. 



Numerous specimens in Smithsonian collections from Francis Sumi- 

 chrast, from the Pacific side of the Isthmus Tehuantepec. 

 LiYLA KXJGULOSA, Gope, sp. nov. Cystignathidarum. 

 Prefrontal bones in close union with each other and the fronto-parietals. 

 Vomerine teeth present ; auditory apparatus well developed. Manu- 

 brium cartilaginous, xiphisternum emarginate. Toes webbed ; dilata- 

 tions well developed, supported by T-shaped phalanges. Abdomen nearly 

 smooth. 



This genus is very near to Hylodes, * differing almost entirely in the 

 webbed toes. Keferstein, who has just described this genus (Archiv. f.'' 

 Naturgesch, 1868, 926), in consequence of his adhesion to the system of 

 Giinther, has attained to a very confused idea of its affinities. 



Character Speciflcus.—B.e&d broad, body short ; heel extends to end of 

 muzzle. Vomerine teeth in two approximated fasciculi, much behind 

 the posterior line of the nares. Choanae half the size of the ostia 

 pharyngea. Tongue oval, one-fourth Iree, openly emarginate behind. 

 Tympanum nearly as large as orbit. Skin thin, with sundry rugosites 

 on the sides of the dorsal region. Muzzle acuminate, not projecting ; 

 nostrils nearly terminal. Canthus rostralis well marked, lores slightly 

 concave ; front a little convex. Tarsal fold slight, metatarsal tubercle 

 one inner. Solar web to the middle of the first (proximal) phalange on 

 the first and fifth digits ; to the base of the same on the others. Third 



- * Lithodytes rhodopis, Cope, Pr. A. N. Sci.. Phil., 1866, 323 is IlyMcs sallce!, Cxthr. P. Z. S. 

 Lond., 186S- 



