Biology of Bdella depressa, a Predaceous Mite1

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Abstract
B. depressa were observed during the spring and fall of 1955 under bark of trees and in grassy areas in the vicinity of Champaign-Urbana, Illinois. This mite was a predator on the clover mite, Bryobia praetiosa, other species of mites, and Collembola. In its development the bdellid mite passed through egg, deutovum, larval, 3 nymphal, and 1 adult stages. B. depressa reared on the clover mite and the 2-spotted spider mite, Tetranychus telarius, at 60[degree]F and 90% R.H. developed from larva to adult in 21 to 30 days, while those at 70[degree]F and 90% R.H. required only 14 to 21 days. Attempts to rear mites at higher or lower temperatures failed. Due at least in part to certain similarities in their life cycles, B. depressa was an important predator of the clover mite.

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