MEXICAN TAILLESS AMPHIBIANS 



81 



third toe slightly longer than fifth; prominent subarticular tubercles; 

 supernumerary tubercles continued backward on plantar surface; a 

 conical tubercle on the middle oj inner edge of tarsus marks the end of the 

 tarsal fold; two small metatarsal tubercles, the inner larger than the 

 outer; the hind limb being carried forward along the body, the tibio- 

 tarsal joint barely reaches beyond insertion of fore limb; head small; 

 snout prominent, acuminate; width of interorbital space greater than 

 that of upper eyelid; can thus rostralis rounded; loreal region sub- 

 vertical; large vocal sac; skin of upperparts, including top of head and 

 upper surfaces of fore and hind limbs, pustulose or tubercular and 

 exceedingly glandular; throat smooth; belly areolate; under surfaces 

 of thighs granular; head-and-body length, 27 to 30 mm. 

 Specimens examined. — Thirty-four, as follows : 



Engystomops pustulosvs 



Museum 



C.A.S 



U.S.N.M... 



Do 



Do 



Catalogue 

 No. 



5108-5123 

 47124 



10023-28 

 30247-57 



Num- 

 ber of 

 speci- 

 mens 



Locality collected 



Oaxapa: 

 Cosolapa 



Santo Domingo (900 feet 



altitude). 

 Tehuantepee 



Date collected 



July 14, 1925 

 June 10, 1895 



By whom collected or 

 from whom received 



Joseph R. Slevin. 

 Nelson and Goldman. 



Francis Sumichrast. 

 Do. 



Genus LEPTODACTYLUS Fitzinger 



1826. Leptodadylus Fitzinger, Neue Classification der Reptilien, p. 38. [Geno- 

 type, Lepiodactylus typhonia Fitzinger = /?aMa typhonia (part) Daudin, 1803, 

 Histoire naturelle des rainettes, des grenouilles et des crapauds, p. 36, pi. 17, 

 figs. 3, 4 (Surinam).] (Type fixed by Fitzinger, 1843, Systema reptilium, 

 fasc. 1, p. 31; nee Rana typhonia Linnaeus, 1758.) 



1830. Cystignathus Wagler, Naturliches System der Amphibien, p. 202. [Geno- 

 type, Cystignathus pachypics Wagler = ^ana pachypus Spix, 1824, Animalia 

 nova, sive species novae testudinum et ranarum quas in itinere per Brasiliam, 

 etc., p. 26, pi. 2, figs. 1, 2 (Brazil).] (Type fixed by Fitzinger, 1843, 

 Systema reptilium, fasc. 1, p. 31.) 



1843. Gnathophysa Fitzinger, Systema reptilium, fasc. 1, p. 31. [Genotype, 

 Cystignathus labyrinthicus Dumeril and Bibron, 1841, Erp^tologie generate, 

 vol. 8, p. ^07 = Rana labyrinthica Spix, 1824, Animalia nova, sive species 

 novae testudinum et ranarum quas in itinere per Brasiliam, etc., p. 31, pi. 7, 

 figs. 1, 2 (Brazil) = /?ana pentadadyla Laurenti, 1768, Synopsin reptilium, 

 p. 32, "in Indiis" (erroneous).] 



1870. Entomoglossus Peters, Monatsber. k. preuss. Akad. Wiss. Berlin, p. 647. 

 Aug. [Genotype, Enio7noglossus pustulatus Peters, idem, p. 647, pi. 2, fig. 1 

 (Ceara, Maranhao, northern Brazil).] 



Various devices have been tried out by amphibians to insure the 

 development of their eggs. Leptodadylus seems to have adopted 

 froth nests for this purpose. These are generally made in water or 

 near water in damp hollows. One South American species lays its 

 eggs on the surface of pools, while another deposits them in holes near 



