Abstract
The Tres Marias archipelago off western Mexico, rarely visited by ornithologists, is currently considered to have 24 endemic subspecies of landbirds. Using both new and previously overlooked information, we evaluate some of the better-marked taxa by applying recently proposed criteria for determining whether they merit recognition at species level. We propose that six of these be elevated to species (Cynanthus lawrencei, Amazilia graysoni, Forpus insularis, Pheugopedius lawrencii, Icterus graysonii and Granatellus francescae) although for some there is evidence that they occasionally interbreed with close relatives on the adjacent mainland. These taxa are threatened by introduced goats, cats and rats, and we hope that by recognising them as endemic species, greater awareness of their plight might stimulate increased conservation action to preserve them and their ecosystem.
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