We provide distribution and abundance information for Farallonophilus cavernicolusRentz, 1972, the Farallon camel cricket, and other commonly encountered ground dwelling arthropods (the tenebrionid beetles Coniontis sp. and Eleodes parvicollis Eschscholtz, 1829, Isopoda, and Microcoryphia) recorded during visits to the Southeast Farallon Island (SEFI) from 2013 through 2015. We found cricket populations in six caves and rock crevices, which were mapped and surveyed. One cave accounted for the greatest cricket numbers, with counts averaging 2787 ± 277 individuals, while the other five caves never exceeded 250 individuals; crickets were most abundant from late September to early November. Behavioral observations and pitfall trapping indicate that crickets leave caves at night and prefer walking along the outer surfaces of walls rather than over open ground and, in some cases, may inhabit large crevices on cliff facings. Crickets were not commonly found under boards, rocks, or seabird burrows on the island, although diversity and numbers of other arthropods were significantly greater under artificial board salamander refuges vs. natural ground cover and during the wetter winter and spring seasons.
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Vol. 94 • No. 4