A Note on the Circulus as an Adhesive Organ in Some Pseudococcidae

Abstract
Adhesive or climbing organs in the form of empodia or pulvilli between the tarsal claws are common structures in Hymenoptera, Diptera, Hemiptera and other orders (Weber 1933). A more unusual type consisting of a small oval sac on the distal end of the tibia of the prothoracic and metathoracic legs of the reduviid Rhodnius prolixus Stål. has been described by Gillett and Wigglesworth (1932).

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