(Fig. 2 I)
Material examined. Three specimens, 316.0–768.0 mm TL: MNRJ 26815 (1, 768.0 mm), T, E- 502; MNRJ 26816 (1, 491.0 mm), T, E- 518; MNRJ 26851 (1, 316.0 mm), T, E- 511.
Distribution. Xenomystax congroides is being reported by the first time in the WSA. It was described from off Suriname, and was also known from the Atlantic coast of Florida, USA, throughout the Gulf of Mexico and Caribbean to the mouth of the Amazon, in the northern coast of Brazil (Smith 1989 b).