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Distribution of members of the hispidus species group (Sigmodon hirsutus, S. hispidus, and S. toltecus). Localities from which samples were obtained are indicated as follows: S. hirsutus (circles), S. hispidus (triangles), and S. toltecus (squares). An asterisk indicates locality where samples of S. hirsutus and S. toltecus were sympatric.
