120 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



terminal phalanges. Cauphias crassum with its hidden tympanum is 

 tentatively recognized as a distinct species, though there are some 

 indications that subsequent collecting may show that it is merely a 

 female of Cauphias guatemalensis. 



The type of Cauphias crassum (M.H.N. P. No. 509a, parchment 

 label No. 6331) was likewise collected by Adolphe Boucard in 1873, 

 according to the catalogue somewhere in Mexico, though it is quite 

 likely that this locality may be incorrect. The following notes were 

 made on the type of this species: Head-and-body length, 54.8 mm.; 

 the hind limb being carried forward along the body, the tibio-tarsal 

 joint reaches to center of eye; tarsal fold distinct and strong; a small 

 inner but no outer metatarsal tubercle ; toes fully webbed, with excep- 

 tion of fourth toe on which the penultimate joint has a dermal fringe; 

 terminal phalanges T-shaped; first finger without basal bifurcation; 

 fingers without web at base; no external indication of tympanum; a 

 dermal fold above and behind normal position of tympanum; distance 

 from eye to nostril less than transverse diameter of eye; vomerine 

 teeth in two rounded clusters between choanae; loreal region oblique; 

 sldn on abdomen coarsely granular; throat with scattered granula- 

 tions; under surface of tliighs areolated; coloration of upperparts gray, 

 without darker markings; slight grayish marbling on upper lip; sides 

 light with gray vermiculation ; throat with gray marbling; abdomen 

 and under surfaces of thighs yellowish. 



Specimens examined. — One, the type. 



Genus TOMODACTYLUS Giinther 



1900. Tomodactylus Gunther, Biologia Centrali-Americana, Reptilia and Batra- 

 chia, p. 219, Apr. [Genotype, Tomodactylus amulae Gunther, idem, p. 219, 

 pi. 64, fig. C (Amula, Guerrero, Mexico).] 



For many years this unique little frog was confused with Physalae- 

 mus and Pleurodema, chiefly on account of the occurrence of a black 

 lumbar spot on some of the species referred to these genera. There 

 are species of Pleurodema that have a lumbar gland, but they have 

 simple terminal phalanges and a sternum with a bony style. Tomo- 

 dactylus, however, has T-shaped termmal phalanges and a cartilaginous 

 sternum and omosternum, but lacks vomerine teeth. It is here recog- 

 nized as a vahd genus related to Eleutherodactylus and Pleurodema. 



TOMODACTYLUS NITIDUS (Peters) 



1869. Liuperus [sic] nitidus Peters, Monatsber. k. preuss. Akad. Wiss. Berlin, 



p. 878, Dec. 

 1900. Tomodactylus amulae Gunther, Biologia Centrali-Americana, Reptilia and 



Batrachia, p. 219, pi. 64, fig. C, Apr. (Amula, State of Guerrero). 

 1927. Paludicola [Liuperus] nitidus Parker, Ann. and Mag. Nat. Hist., ser. 9, 



vol. 20, no. 118, p. 451, Oct. 



