Bachia gr. flavescens

Distribution: Widespread in the Amazonian region of Brazil, French Guiana, Suriname and Guyana (Ribeiro-Júnior & Amaral 2017). In Colombia there are some records in the eastern Amazonia region, in the departments of Guaviare and Vaupés (Fig. 4B).

Similar species: Bachia flavescens may be differentiated from other cis-Andean species of the B. heteropa group ( B. alleni, B. guianensis, B. heteropa, B. pallidiceps, B. trinitatis) and B. bresslaui group ( B. bresslaui, B. cacerensis, B. panoplia, B. psamophila, B. pyburni, and B. scolecoides) in having quadrangular dorsal scales (hexagonal to lanceolate in B. bresslaui and B. heteropa groups). See Dixon (1973), Ávila-Pires (1995), and Ribeiro-Júnior et al. (2016) for a detailed description and comparisons.

Remarks: Bachia flavescens has been suggested as a species complex given its broad morphological variation (Kizirian & McDiarmid 1998; Ribeiro-Júnior & Amaral 2017). Previously, Dixon (1973) suggested that the individuals from Colombia belonging to the B. flavescens group may correspond to an undescribed species.