Boa Constrictor,

Boa occidentalis Philippi, 1873

Formerly treated as a subspecies of Boa constrictor and recently split (González, Bezerra de Lima, Passos, Silva, 2024). An individual of this species was photographed (Fig. 25) on 2 February 2024 at Cruce Don Silvio, Boquerón department (22°04’52.9”S 62°07’57.5”W) by MF, (and was also observed by PS and PC). This extends the range of the species westwards in the Paraguayan Chaco and into the northern Pilcomayo region, 109.2 km southwest of the nearest known locality, Transchaco Road (Ruta IX) km 613 (Cacciali et al., 2016b). The species is considered to be “Vulnerable” in Paraguay (Martínez et al., 2020c).