Alopoglossus bicolor (Werner, 1916)

Distribution: Endemic to Colombia, along the upper Magdalena River Valley and the adjacent Cordillera Oriental, including its eastern foothill in the Meta department (Harris 1994; Fig. 4A).

Similar species: Alopoglossus bicolor can be easily distinguished from all other sympatric and similar species of the genus due to the lack of prefrontal scales (present in A. atriventris, A. avilapiresae, A. brevifrontalis, and A. buckleyi). For a more detailed description see Harris (1994).

Remarks: Harris (1994) suggested that specimens from Portachuelo in the department of Meta may correspond to a hybrid population between " Ptychoglossus bicolor " (= A. bicolor) and " Ptychoglossus nicefori " (= A. brevifrontalis), which he called “ Ptychoglossus cf. bicolor ”. However, based on the morphological characters provided by Harris (1994), the specimen we examined from Portachuelo is in agreement with A. bicolor .