THORIUS.—DERMOPHIS. 305 
Body rather elongate, with 13 costal grooves, its length being nearly four times the 
distance of the snout from the gular fold. Limbs weak, digits rudimentary. Para- 
sphenoid teeth confluent into a single group. Brown, with a dark band along the 
side, edged with whitish above. 
Totallength . 2. 2. 2. 2... . 48 millim. 
Length oftail. 2. 2. 2... . . ek 28 
3) 
Division BATRACHIA APODA. 
DERMOPHIS. 
Dermophis, Peters, MB. Akad. Wiss. Berlin, 1879, p. 937. 
Kyes distinct ; tentacle in a circular groove, in front and below the level of the eye ; 
rudimentary scales imbedded in the skin. Mandibulary teeth behind the main series 
indistinct, if present at all. 
1. Dermophis mexicanus. 
Siphonops mexicanus, Dum, et Bibr. Erpét. Gén. viii. p. 284; A. Dum. Mém. Soc. Se. Nat. Cherbourg, 
ix. p. 23, fig. 10 (1863); Brocchi, Miss. Sc. Mex., Batr. p. 120, t. 21. fig. 2; Sumichrast, 
Bull. Soc. Zool. Fr. 1880, p. 190. 
Dermophis mexicanus, Peters, MB. Akad. Wiss. Berlin, 1879, p. 937, fig. 6; Bouleng. Batr. Grad. 
p. 98, t. 8 fig. 2. 
Hab. Mexico, Tehuantepec (Sumichrast), Teapa in Tabasco (H. H. Smith); Guaremata, 
Pacific coast (Salvin); Panama (Dow). 
Habit stout, the circumference of the body * being about one-seventh or two- 
thirteenths of its length. Snout rounded, moderately projecting beyond the mouth, 
its length equal to the distance between the eyes. 150-170 circular folds, of which 
the (about) 50 anterior and 20 posterior are complete, the intermediate being alter- 
nately complete or interrupted on the abdomen. Brownish or plumbeous above, 
whitish below ; folds brownish-black. 
Mexico. Guatemala. Panama. Locality ? 
Total length . . . . 407 millim. 451 millim. 410 millim. 240 millim. 
Circumference . . . 60 ,, 62a, 60a, 38, 
Of this species I have before me a sufficient number (ten) of specimens to ascertain 
that there are no inner mandibulary teeth ; one specimen only (from Panama) shows 
* In this and the following descriptions I use the circumference of the body for comparative measurement 
in preference to the diameter, as the latter is frequently altered, and may be even misleading in specimens in 
which the shape of the body is distorted. 
