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Published online by Cambridge University Press: 31 May 2012
♂ ♀.—Thrassis desertorum belongs to that section of the genus which is characterized by having metatarsal segment I equaling or slightly exceeding II. In this species metatarsal segment I equals II and III together. The labial palpi exceed the fore-trochantera. The lower genal row consists of 3 bristles ; the upper bristle is located higher than the eye; the middle, and smallest, one is inserted closer to the upper than to the lower genal bristle.