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Thirty-six species of spiders (Araneida) were collected by various methods in representative alfalfa fields in Northern California, June 1971 through October 1973. The most abundant species was Pardosa ramulosa McCook (Lycosidae), which comprised ca. 60% of the 14,522 specimens collected with the D-Vac®. Other abundant species were Erigone dentosa O. Picard-Cambridge and Collinsia plumosa (Emerton) (Erigonidae) and Linyphantes aeronauticus (Petrunkevitch) (Linyphiidae).
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Yeargan et al. (1974) studied this question.
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