9. Hl'LODES. 211 



arc abruptlj- incurved without meeting ; tympanum distinct, a broad 

 vertical oval, as large as the eye. Disks and subarticular tubercles 

 of fingers and toes small. The hind limb being carried forwards 

 along the body, the tibio-tarsal articulation reaches the eye. Skin 

 smooth ; two suprascapular longitudinal dermal folds, converging 

 towards the middle line without meeting. General colour ashen 

 grey ; a large black spot below the eye, and another above and on 

 the tympanum ; a dark band with a pale superior border above each 

 ilium ; belly and concealed faces of hind limbs yellow, coarsely 

 reticulated with blackish ; throat thickly dusted with the same. 

 W. coast of Central America. 



22. Hylodes megacephalus. 



Lithodvtes megacephalus, Ct)/je, Journ. Ac. Philad. (n. s.) viii, 1876, 

 p. 110, pi. 23. f. 11. 



Tongue oval, entire. Vomerine teeth in two short approximated 

 series entirely behind the choana;. Head very large, broader than 

 the body ; canthus rostralis distinct ; nostril nearer the tip of the 

 snout than the eye ; orbits oblique, the superciliary borders rising 

 from the end of their anterior third into a strong ridge, which runs 

 in a straight line and terminates abruptly in a slight thickening at 

 the posterior border of the cranium ; posterior half of the cranium 

 above deeply grooved ; tympanum distinct, vertically oval, one third 

 the diameter of the eye. Limbs short. Toes entirely free ; disks of 

 fingers and toes small ; a single metatarsal tubercle. Skin smooth 

 above and beneath, with the following exceptions : — A dermal fold 

 extends from each exoccipital region on each side of the back, pur- 

 suing a concave course to the middle of the transverse process of the 

 sacrum ; a similar fold extends from the vent on each side, in an 

 oblique direction, to the end of the transverse sacral process ; sides 

 of body areolated. Light ash above ; a black spot extends from the 

 tympanum to the scapula, and scuds a line to the eye ; limbs cross- 

 barred ; hinder side of thighs black, marbled distally with ash ; sole 

 of foot black ; lower surfaces white, marbled with black. 



Pico Blanco, Costa Rica. 



23. Hylodes gulosus. 



Lithod}i:es gulosus, Cojje, I. c. p. 112. 



Very closely allied to H. megacephalus, from Mhich it differs in the 

 following points : — Head relatively smaller. j^o dermal plicae. 

 Dark leather-brown above ; a black spot across the tympanum, and 

 one under the eye ; brown beneath, irregularly marbled with white. 

 Size of Leptodactylus penladactyhis. 



Pico lilanco, Costa Eica. 



p2 



