1877. 89 pean; 
LITHODYTES PELVICULUS Cope. 
Lateral borders -of the fronto-parietal bones elevated into longitudinal 
crests, which on the vertex are abruptly incurved without meeting. Tym- 
panic disc a broad vertical oval, as large as eye ; vomerine teeth in short, 
approximated, transverse, fasciculi, behind the line of the posterior border 
of nares. Head short, very wide, muzzle not projecting. Heel of extended 
hind foot reaching to middle of orbit. Gray varied with blackish above 
and below. 
This species resembles nearly the L. megacephalus Cope, Journ. Acad. 
Phila., 1875, p. 100, but differs in a number of puints. The first is the 
much greater size of tympanic disc, whose diameter is only about half 
that of the orbit in the latter; in the posterior incurvature of the super- 
ciliary crests (they are straight in L. megacephalus) ; in the much smaller 
size, the linear dimensions being less than half those of the L. mega- 
cephalus. 
There are two suprascapular longitudinal dermal folds which converge 
towards the middle line without meeting. Pallettes and tubercles small. 
Canthus rostralis straight, intercanthal region plane; muzzle a little re- 
treating, nostrils terminal. General color ashen gray ; a large black spot 
below eye, and another above, and on tympanum; muzzle, interorbital, 
and interscapular regions dusky. Soles and posterior faces of femora black. 
Concealed faces of hind feet and limbs and abdomen, yellow coarsely 
reticulated with blackish ; throat thickly dusted with the same. A dark 
band with a pale superior border above each ilium. 
The L. pelviculus is said to have been found on the west coast of Cen- 
tral America, without more special designation of locality. 
PHYLLOBATES CYSTIGNATHOIDES Cope. 
This rather small species has the form of the species of Lithodytes, as L. 
rhodopis or some of the Cystignathi. The muzzle is rather elongate and 
the front rather convex. The limbs are rather long, and the tubercles on 
the inferior side of the digits are prominent. The terminal dilations of 
the toes are of moderate size, and equal on the two limbs. 
The apex of the muzzle is narrowed, but rounded, and does not project 
much beyond the lip. Its distance from the nostril is one-third that be- 
tween the latter and the orbit. The tympanic disc is very distinct, is sub- 
round, and its diameter is one-half that of the orbit. The tongue is pyri- 
form and much narrowed in front. The nares are sublateral, and the ostia 
pharyngea very small. The end of the tarsus extends beyond the muzzle, 
and the heel marks the middle of the eye. Both tarsal tubercles are dis- 
tinct. There are strong tubercles along the inferior face of each metatar- 
sal. The skin is everywhere entirely smooth. 
Measurements. M. 
Length of head and body.......... Rie aaiUlee ex aane 0225 
ee © +e including tympana...........-.0.005 -0075 
Width ‘* ‘* attympana..... Bs he bu pisieaele eatin eels .0070 
PROC. AMER. PHILOS. soc. xvi. 100. L 
