Abstract
Thaumastaneis nigricans, a new species of Larginae from Bolivia, is described and compared with T. montandoni Kirkaldy & Edwards, the only other species known of the genus. This latter species is recorded from Paraguay for the first time, and its association with a Camponotus ant worker (Hymenoptera: Formicidae) and a Trigonidiidae cricket (Orthoptera) is mentioned. Several features of Thaumastaneis montandoni are illustrated via SEMs.
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