Four Males of Andrena (Hymenoptera: Andrenidae)

Abstract
Many species in the genus Andrena have been described from one sex only. During studies of this genus in Ontario, the authors have associated the males of four species with the appropriate females. The males of Andrena (Trachandrena) alleghaniensis Viereck, A. (Leucandrena) chippewaensis Mitchell, A. (Conandrena) rufosignata Cockerell and A. (Gonandrena) dreisbachi Mitchell, all previously unknown, are described in this paper.

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