Mitchell placed this species in the genus Tetralonia. In Florida, these species are restricted to the northern peninsula and panhandle. They are spring-flying and visit from many plant families but not composites. Timberlake revised the genus. He states that E. atriventris, E. dubitata, E. hamata, and E. rosae are the main eastern species. Records of E. speciosa and E. dilecta are in error. Of these four species, he only mentions E. rosae as occurring in Florida, with E. atriventris known from Georgia, E. hamata known from North Carolina and Georgia, and E. dubitata in South Carolina and Georgia. Mitchell lists a species, E. fulvohirta (as Tetralonia fulvohirta, originally described as Melissodes fulvohirta by Cresson), that is not discussed by Timberlake nor can I find any synonymy for it. It was known from North Carolina to Georgia. I have listed the key for the four known Eastern species although only two species (E. dubitata and E. rosae) have been collected from Florida.
Scopal hair of hind legs pale (bright fulvous) and hair on inner side of hind basitarsi ferruginous….3
Larger, about 15-16 mm long; apical depression of tergite 2 finely punctured and with short appressed hair almost to apical margin; mesonotum dull, with shallow punctures.. E. atriventris
Hair of abdomen black beyond tergite 1; hair of head and thorax pale fulvous or ochreous, varying to whitish, apical depression of tergite 2 more or less thinly punctate and hairy…E. dubitata
Lateral carina short, weak, or absent..2
Spurs of middle and hind tibiae normal; lateral lobes of sternite 6 comparatively weak or absent…3
Clypeal mark ending some distance from margin of eyes, even when oculoclypeal interval is very narrow. .E. atriventris
County Records: Leon
Locations: Tall Timbers Research Station
Dates: April to June over entire range; specimens from Leon County were collected in April
County Records: Alachua
Dates: April to June; likely earlier rather than later.