Drawn from Nature on stone by B. Waterhouse Hawkins.
Printed by C. Hullmandel.
| 1. | Borborocœtes | Bibronii. | 1a. Mag. View of Tongue & Gullet. Nat. Size. |
| 2. | Grayii. | ||
| 3. | Pleurodema | Darwinii. | |
| 4. | elegans. | ||
| 5. | bufoninum. |
Dentibus palatinis in fasciculis distantibus obliquis pone nares posteriores positis; palmis bituberculatis.
Habitat, Chiloe and Valdivia.
Description.—Head depressed, the vertex slightly concave between the orbits; front (space included between two lines drawn from the anterior corner of the orbits to the point of the nose) triangular and distinct. Nostrils lateral. Eyes rather prominent. Tongue broad, ovate, acuminated in front, behind entire and rounded, the posterior half and the sides detached. Palatine teeth in two oval parcels, direct obliquely backwards and inwards, and situated at some distance behind the line of the posterior margin of the nares. Tympanum concealed. Body rather depressed and short. Skin smooth and without pores or glands, excepting on the posterior and inferior surface of the thighs, where there are some small granular elevations. Pore legs two-thirds the length of the head and body. The fore-arm rather larger than the upper arm. The fingers entirely separated, the third considerably the longest. A small tubercle under each joint, and two on the palm near the wrist. Length of the hinder legs to that of the head and body as 5 to 3, or rather more. Toes connected only at their base. A small tubercle under each joint, and a very depressed one at the base of the inner toe.
Colour of the upper parts fuscous, with a lateral fascia extending from the orbit nearly to the thigh, of a dark-brown colour, bordered with whitish; and another of an elongated triangular form on each ilium. Legs with transverse incomplete faciæ of the same colour. Under parts grey, with numerous brown dots.
| DIMENSIONS. | |||
|---|---|---|---|
| Inches. | Lines. | ||
| Length | of the body and head | 1 | 5 |
| of the anterior extremities | 1 | 0 | |
| of the posterior extremities | 2 | 6 | |
Taken at Valdivia and at Chiloe, in a thick forest, by Mr. Darwin.
Dentibus palatinis in fasciculis subcontiguis paulò obliquis, pone nares posteriores positis; palmis non tuberculatis.
Habitat, Valdivia.
This species considerably resembles the former in most of its characters. The palatine teeth, however, form at 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 this 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.
I have thought it right to follow Tschudi in separating from the genus Cystignathus 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.
Dentibus palatinis paucis, minimis; lingua subcordatâ, vix emarginatâ; glandulis lumborum magnis, rotundis, convexis; digitis posticis ad basin tantùm membranâ connexis; dorso sparsìm tuberculato-glanduloso; suprà pallidè virescens, maculis fusco-olivaceis.
Habitat, Maldonado.