Xenoxybelis argenteus (Daudin, 1803)

Fig. 4 A, B

Specimen examined.

One adult female (MNHC-R 442) collected at 2315 h on 17 August 2001 from Villa Fatima community, Territorio Indígena y Parque Nacional Isiboro Sécure (TIPNIS) (Table 3, Fig. 5).

Morphometric and meristic characters.

Snout-vent length 691 mm. Tail length 411 mm. Smooth dorsal scales 17-17 - 15 rows, without apical pits. Ventral scales 209. Subcaudal scales 182. Undivided cloacal plate. Loreal absent. Preocular 1. Postoculars 2. Temporals 1 + 1 + 2 / 1 + 2 + 2. Supralabials 6; fourth contacting the orbit. Infralabials 7; the first four contacting the first pair of chin shields (Table 4) and fourth and fifth contact the second pair of chin shields.

Coloration pattern.

Upper center region of head brown; dorsolateral region of the head and supralabials light brown green, separated by broad grayish-green band, from nasal, crosses the eye, and extends to the body; ventral surface of the head yellowish green with scattered black points. Dorsal surface of the body light-greenish brown with two thin greenish-brown lateral bands; ventral surface bright yellowish green anteriorly and light green posteriorly with two lateral green bands (Fig. 4 A, B).

Ecological notes.

The specimen was found during the night resting on a branch of Piperaceae at a height 1.9 m off the ground in a secondary forest close to a stream.