Apoidea

ENGEL, MICHAEL S., 2001, A Monograph Of The Baltic Amber Bees And Evolution Of The Apoidea (Hymenoptera), Bulletin of the American Museum of Natural History 2001 (259), pp. 1-1 : 1-

Key to Divisions of Apoidea

1. Body setae simple; metabasitarsus not broad­ er than remaining tarsal segments, frequently with strigil; female T7 not divided into hemitergites...... ‘‘Spheciformes’’

– At least some setae, particularly those of legs and surrounding propodeal spiracle, branched or plumose; metabasitarsus flattened, wider than remaining tarsal segments, without strigil; female T7 divided into hemitergites (bees)..... Apiformes