| Sumario: | Nineteen species of psocids were found in Socorro Island, 704 km W of Manzanillo, Colima, México, and six species of psocids were found in Clarión Island, 372 km. W of Socorro, and 1076 km W of Manzanillo. Socorro Island has an area of 167 km2, and Clarión Island has an area of 25 km2. AH but two of the Clarión psocid species aiso occur in Socorro. Oniy two of the 21 species of both islands are endemic; one occurs in both islands and the other is present oniy in Clarión; they both beiong in genus Cerobasis. Most of the nonendemic species are found on the Pacific coast of México, east of the islands. Seven of the 21 species of psocids of the Revillagigedo Islands aiso occur in the Tres Marías Islands, and 13 species of the Revillagidedo Islands are also present in the Pacific coast of Mexico, to give an index of faunistic similarity of 0.19 with both areas. The psocid fauna of Socorro and Clarión islands constitute and impoverished extensión of the psocid fauna of the Pacific coast of México, explainable by the distance from the coast, and the small area of the islands.
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