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Appendix A. A map of northern Argentina.

FIG. A1. Map of northern Argentina illustrating the overlap in the distributions of S. invicta (light gray shading) and L. humile (diagonal hatching). Solid lines represent major rivers and the dark gray shading represents the Rio de la Plata and Atlantic Ocean. Dashed lines represent country borders. Major port cities (closed circles) and the two study sites (open circles) are also featured.