. .
i !
B o r b o r o c c e t e s G r a y i i , 3Iihi.
P late X V I I.—Fig. 2.
Dentibus palatinis in fasciculis subeontiguis pauU obliquis, pone nares posteriores
p o sitis; palmis non tubercxilatis.
Habitat, Valdivia.
This species considerably resembles the former in most of its characters
Ih e palatine teeth, however, form a t once a certain and tangible distinction and
there are some minor points in which they differ, sufficient at a glance to determine
them. The head in the present animal is broader than it is long- in the
former the breadth is only equal to its length. The palms are in th i s ’species
without conspicuous tubercles ; in the other there are two, although very small.
In colour it differs much from the former. The general colour is a rich
fuscous brown, rather paler beneath; the flanks, the throat and belly, and the
whole of the thighs and legs, with various white markings, those of the throat
and belly being the smallest. This species was found in the forest, in Valdivia.
G e n d s -P L E U R O D EM A . Tschudi.
I have thought it right to follow Tschudi in separating from the genus
Cxjstigimtlms of Wagler, such species as have large and conspicuous lumbar
glands particularly as they all agree in possessing a much more bufonine aspect
than the others. The discovery of three new species, all agreeing in these
characters with Pleurodema Bibronii of Tschudi. increases the importance of the
grounds upon which this separation is made.
P l e u r o d e m a D a r w i n i i . M i h i .
PiATr X V I I.—Fio. 3.
Dentibus palatinis paueis, minimis; lingua subeordati, vix ■ emarginati ; gianauus
lumborumnmgnis, rotundis, convexis; digitis posticis ad basin tantiim membrana
Habitat, Maldonado.
D e s cm p t io n .— H e ad trian g u lar, ra th e r bro a d er th a n long. Muzzle ro u nded. E y e s slightly p ro min
en t. T o n g u e somewhat hea rt-shaped, scarcely em a rg in a ted behind. P a la tin e te e th very
few, an d with difficulty p erceptible, plac ed in two small groups between th e posterior nares.
Body thick an d broad, with numerous g lan d u la r tubercles sca tte red over th e surface, p rin c ipally
on th e a n te rio r parts, an d assuming somewhat o f a lo ngitudina l arran g em en t. L um b a r
glands large, ro u n d , a n d p rom in en t. Legs ro b u st an d short. T o e s o f th e fore fe et wholly
separate, with a small tuberc le u n d e r each jo in t, a n d two larg e r ones a t th e h in d e r p a rt o f the
palm. H in d e r toes, w ith a ru d im en ta ry membrane a t th e base, a small tnberc le u n d e r each
jo i n t ; th e first a n d second toes very short. A conical tu b erc le a t th e in n e r, a n d an o th e r a t
th e o u te r side o f th e metatarsus.
C o lo u r.— T h e u p p e r surface is beautifully marbled with dark olive or black, on a lig h t-g ree n
g ro u n d ; some o f th e markings assume somewhat o f an oce lla ted form, an d approach to a
symmetrical arrangement. T h e lum b ar glands are more strongly coloured th an th e o th e r
p a rts , th e ce n tre b ein g black, an d n ea rly su rro u n d ed by a b rig h t line o f very lig h t gre en, or
n e a rly white. T h e th ig h s are numero u sly b anded with th e prevailing colours, an d a tin g e o f
orange o r red . B e n e a th p a le ; in some specimens blackish u n d e r th e chin.
The aspect of this species is remarkably bufonine ; and this character is increased
by the numerous glandular tubercles on the surface of the body, and
pores about the parotid region. I t is, doubtless, similar in its habits to many of
the toads.
DIMENSIONS.
In. Lin.
Length of the Lead and body............................ 1 4
of the anterior extremities................... 0 8
of the posterior extremities ............... 1 7
I t was repeatedly found by Mr. Darwin a t Maldonado, near the mouth of
the river La Plata.
P l e u r o d e m a e l e g a n s . Mihi.
P latb x v i i .—Fm. 4.
Dentihus palatinis prominentibus, in fasciculis binis ovatis obliquis dispositis;
lingua rotunda integri ; glandulis lumborum ovalibus, valdl convexis ; digitis
posticis hand palmatis ; dorso tuberculato-glanduloso, fusco, nigro obscurl maculato,
fascia longitudinali pallidi.
Habitat, Valparaiso, Valdivia, and Archipelago of Chiloe.
D e s c m p t io n .— H e ad semi-clliptic, as broad as long. Muzzle ro u n d ed . E y e s v e ry slightly promin
e n t. T o n g u e large , ro u n d , en tire , very thiek. P a la tin e te e th p rom in en t, disposed in two