INVESTIGATIONS ON PARAGUAYAN B ATRACHIANS. 
213 
Coloration. The young specimen pale reddish brown above with 
indistinct darker not confluent spots and indistinct cross-bars on the 
limbs. A. blackish brown lateral band extends from behind the eye near 
to groin, sharply edged above, paler and more irregularly below; from 
this band below the conceited tympanum runs a more or less distinct 
dark branch vertically to the angle of the mouth, edged on both of its 
sides with white or pale brown.* Edge of the upper lip dark brown with 
more or less distinct irregular vertical bars ; canthus rostralis more or 
less pronounced dark brown. A round black inguinal spot absent.** 
Beneath greyish white, throat and breast mottled with brown. The older 
specimen similar, but nearly uniform greyish rose coloured above, only 
on the posterior part of the back with obliterate light brownish markings 
and a trace of cross-bars on the hind limbs; beneath white with some 
brown spots on the throat, breast and belly. 
The struetur of the sternal apparatus (pl. XIII, fig. 6) characterized 
by a semiossified omosternum and a bifid bony style of the ster¬ 
num furnished in front with a pit, every branch of its endings in 
an anchor-shaped cartilaginous plate. 
This forked structure of the sternum was not known in literature 
up to this time, I think, however, that it is of great importance, because 
some Paludicola — for example Paludicola fuscomaculata Stdr. (pi. 
XIII, fig. 7) — have the same structure, but others — as Paludicola 
Bibroni Tschudi (pl. XIII, fig. 10) — possess a two -jointed simple 
bony style and a simple cartilaginous plate, with a deep cleft 
in the middle. 
The latter group may for this reason and for the presence of vome¬ 
rine teeth be separated as a distinct genus from Paludicola, namely as 
Pleurodema Tschudi, with the type Pleurodema ; Bibronii Tschudi.*** 
A second species of this genus would be Pleurodema (Lystris) brachyops 
CoPE,f in which «xiphisternum an osseous style, with furcate cartilage 
disc», as stated by Cope. 
* In Paludicola gracilis Blgr. this branch absent and the lower edge of the 
dark band between the eye and the arm straigther. 
** In Paludicola gracilis Blgr. mostly a well developed flat lumbar gland, 
covered above with a roundish black spot. 
*** The genus was called Pleurodema by Tschudi, but the species : Pleuroderma 
Bibronii (Classif. d. Batrachier, 1838, p. 84, 85). 
f Proc. Acad. Philad., 1868, p. 312. 
