Four new fall-emergent species of Andrena from the southwestern United States are described. Andrena brooksi n. sp., from southeastern Arizona and southwestern New Mexico, is a close relative of A. reflexa Cresson, and belongs to the subgenus Callandrena Cockerell. A. neffi n. sp., A. mimbresensis n. sp., and A. vogleri n. sp. were all collected in the same area of the Mimbres Mountains of New Mexico. These species belong to a clade formerly ascribed to Callandrena but which has been shown by phylogenetic analysis to be only distantly related.
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