(Salmo spilurus)
The Rio Grande trout, which is also a cutthroat, has a very limited
distribution within the territorial scope of this work. It is found in
the streams of the eastern slope of the Sierra Madre Mountains of
Chihuahua, Mexico. Its head is shorter and more rounded than the other
species of the cutthroat, with a mouth also very large. The spots are
principally confined to the latter half of the body and most profuse on
the tail.