Abstract
Zanysson gemmatus sp. nov. (Hymenoptera: Apoidea, Crabronidae) is described from northwestern Colombia and compared with all species currently assigned to this genus. It is the first new species in this strictly New World genus recognized since 1938 and the first recorded from Colombia. The new species can be identified by the remarkable scutellar structure and pattern of color and pilosity of the legs. Nothing is known about its biology, but members of Zanysson are assumed to be cleptoparasites of other crabronid wasps
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