13. LEPTODACXYLXTS. 245 



width of the ej-e. Toes without dermal margins. The hind lira!) 

 being carried forwards along the bod}-, the tibio-tarsal articulation 

 reaches the posterior border of the orbit. Dorsal skin without 

 glandular folds ; an abdominal discoidal fold. Colour above dark 

 brown, with a blackish pale-edged triangle between the eyes, with 

 its apex directed posteriorly ; a dark light-edged spot below tlic 

 front of the orbit ; tympanum and a streak behind it blackish. 

 Ouanajtiato, Mexico. 



13. Lsptodactyliis perlaevis. 



Cystignathus perlaivis, Cope, Proc. Atner. Philus, Soe. xviii. 1879, 

 p. 269. 



Tongue a longitudinal oval, entire. Vomerine teeth in two short 

 transverse series behind the choana). Snout a little projecting, with 

 distinct canthus rostralis, the nostrils about one third the distance 

 from its apex to the orbit ; tympanum not quite two thirds the 

 width of the eye. Pirst finger a little longer than second ; foot 

 slender ; plantar tubercles insignificant. The hind limb being carried 

 forwards along the body, the tibio-tarsal articulation reaches in 

 front of the eye. Skin exceedingly smooth and shining, without 

 glandular folds : an abdominal discoidal fold. Dark ashy grey 

 above ; sides blackish above, speckled with white and ])lackish 

 above ; an interorbital dark spot ; upper lip marbled ; posterior face 

 of femora dark, with light specks _; posterior limbs obscurely cross - 

 banded. 



Tehuantepec. 



14. Leptodactylus alMlabris. (Plate XVI. fig. 4.) 



CystigTiathus albilabris, Giinth. Ann. S,- Mag. N. H. (3) iv. p. 217; 



'Reinh. 8,; lAitk. Vidmsh. Meddd. 18G2, p." 205. 

 -— — caliginosus, Brocchi, Bull. Soc. Fhilom. (7) i. p. 180. 

 labialis, Cope, Proc. Amor. Pliilos. Snc. xvii. p. 90, and xviii. 



p. 269. 

 Leptodactylus caliginosus. Brocchi, Miss. Sc. Mej-.. Bafr. p. 87, pi. 5. 



f. 1. ^ 



labialis, Brocchi, I. c p. 20. 



albilabris, Boiilcmj. Bull. Soc. Zool. France, 1881, p. -3:3. 



Tongue oval, slightly nicked behind. Vomerine teeth in two 

 slightly curved series behind the choanae. Snout subactiminate, 

 with prominent upper lip, a little longer than the greatest orbital 

 diameter ; nostril a little nearer the tip of the snotit than the eye ; 

 interorbital space not much narrower than the upper eyelid ; tym- 

 l^anum not C[uite two thirds the width of the eye. Fingers mode- 

 rate, first longer than second ; toes moderate, not fringed ; subar- 

 ticular tubercles well developed ; sole with regular series of small 

 tubercles corresponding with the metatarsals ; two small metatarsnl 

 tubercles. The hind limb being carried forwards along the body, 

 the tibio-tarsal articulation reaches the eye, or not qtiite so far, 



