Gymnoprosopa polita Townsend, 1892 (Figure 13)
Gymnoprosopa polita Townsend, 1892: 109 [♀]
Gymnoprosopa polita : Allen, 1926: 96 [description of ♂, redescription of ♀; faunistic; type revised]; Krombein, 1961: 80 [habits]; Downes, 1965: 936 [catalogue]; Pape, 1996: 89 [catalogue]; Shewell, 1987: 1180, figure 90 [drawing of head].
Hilarella polita : Coquillett, 1897: 128 [redescription of ♀]; Aldrich, 1905: 477 [catalogue].
Holotype (female): USA, south part of Florida. Deposited in SEM.
Synonym:
Gymnoprosopa clavifrons Townsend, 1892: 109 [♂].
Gymnoprosopa clavifrons : Coquillett, 1897: 127 [redescription of ♂].
Holotype (male): USA, Illinois, Carlinville. Deposited in SEM.
Distribution: Nearctic: Canada (Ontario 4), USA (Arizona 5, Connecticut, Florida, Illinois, Kansas, Minnesota, Mississippi, New Jersey, New Mexico, New York, North Carolina 6, Ohio, Virginia).
Habits: Adults feed on flowers of Euphorbia albomarginata (Krombein, 1961) and from the honeydew at tulip tree; in mountains flies are distributed up to 5000 feet a.s.l. (Allen, 1926).