Micrurus pyrrhocryptus (Cope, 1862)

Type locality. Río Bermejo, province of Formosa, Argentina .

Distribution. Known from Argentina, Bolivia, Brazil,and Paraguay in the southern portion of the South American open diagonal (Plt. 109A). Widespread in the Chaco, occurring marginally in extreme western Brazil (Urucum and Amolar ranges) in Chiquitano Dry Forest and contact zones with the Pantanal (Fig. 109A) at low elevations (Plt. 109B). Previous maps and taxonomy in Roze (1996), Silva Jr. and Sites (1999), Campbell and Lamar (2004), and Silva Jr. et al. (2016). Observed in the field in Chaco shrubland (Sousa et al., 2010).