Nomiinae Robertson

Engel, Michael S., 2015, Notes on family-group names for bees (Hymenoptera: Apoidea), Journal of Melittology 2015 (46), pp. 1-7 : 3-4

Subfamily Nomiinae Robertson

Dieunomiini Engel, new tribe

ZooBank: urn:lsid:zoobank.org:act:36893EC0-3899-4245-9D30-3AB083C4DEB3

TYPE GENUS: Dieunomia Cockerell, 1899 .

DIAGNOSIS: Robust bees of moderate to large size (7–23 mm in length); head capsule deep, gena and vertex broad, curving gradually to occipital surface; pronotum without transverse carina; metabasitibial plate of female with distinct marginal carinae, rounded apically; metasomal tergum I with mediolongitudinal depression reaching angle of anterior- and dorsal-facing surfaces, summit of depression broadly V-shaped and slightly elevated above dorsal-facing surface; metasomal terga II–IV apically with marginal setal bands, marginal areas not opaquely colored in contrast to tergal discs; metasomal sterna II– V of female with dense scopa, scopal setae extend dorsolaterally onto lateral margins of corresponding metasomal terga.

INCLUDED GENERA: Dieunomia Cockerell and Epinomia Ashmead , both found exclusively in North America.

COMMENTS: The recognition of the current tribe serves to emphasize the putatively sister relationship of these bees to other Nomiinae , their status as the only exclusively North American lineage of the subfamily, and their distinctive morphological features (outlined above).