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From Discover Life:

'The male may be distinguished from many species by the
yellow maculations on its 6th metasomal sternum and by the tooth on its
hind femur; from A. melliventris by the brown-black on the anterior surface
of its first metasomal tergum; from A. texanus and A. angelicus by its lack
of conspicuous metallic tints on metasomal tergum 4, and by its lack of a
broad, subapical, transverse ridge on metasomal sternum 4; and from males
of A. splendens, A. cocherelli and A. femoratus by its unmodified hind
basitarsus.'