Ocyptamus Macquart, 1834

Mengual, Ximo, Miranda, Gil Felipe G. & Thompson, F. Christian, 2018, Unraveling Ocyptamus and the Baccha legacy (Diptera: Syrphidae): redefinition of groups and new species descriptions, Zootaxa 4461 (1), pp. 1-44 : 10

Genus Ocyptamus Macquart, 1834 stat. rev.

Figs 45 , 47–50 .

Ocyptamus Macquart, 1834: 554 , as a genus. Type species: Ocyptamus fascipennis Macquart, 1834 (subsequent designation by Coquillett (1910: 577); jun. syn. of Baccha fuscipennis Say, 1823 ).

Cryptamus Stahl, 1882: 97. Misspelling.

Baccha (Ocyptamus) . Hull (1949a).

Baccha funebris species group. Hull (1949a).

Ocyptamus cylindricus species group. Thompson (1981), Mengual et al. (2012), Miranda et al. (2016).

Diagnosis. Pedicel with medial acute extension over the basoflagellomere. Parallel-sided elongated or slightly oval abdomen.

Biology. The known larvae of the species within this group feed only on aphids ( Hemiptera : Aphididae ) (see Rojo et al. 2003).

Comments. Dark flies with usually dark wings, Ocyptamus sensu stricto is readily distinguished by the medial extension of the pedicel, more distinct on the female, and with a distinct anterior row of long pile on the scutum forming the mesonotal collar. For a long time, it held all ‘ Baccha ’ species described in the New World.

Species list (19): O. antiphates ( Walker, 1849) , O. calla ( Curran, 1941) , O. cylindricus ( Fabricius, 1781) , O. dimidiatus ( Fabricius, 1781) , O. fasciatus ( Röder, 1885) , O. funebris Macquart, 1834 , O. fuscipennis ( Say, 1823) , O. gastrostactus ( Wiedemann, 1830) , O. icarus Reemer, 2010 , O. inca ( Curran, 1939) , O. infuscatus ( Bigot, 1884a) , O. iris Austen, 1893 , O. medina ( Telford, 1973) , O. megafemur Thompson sp. nov., O. papilionarius ( Hull, 1943b) , O. princeps ( Hull, 1944b) , O. stolo ( Walker, 1852) , O. tarsalis ( Walker, 1836) , O. urania ( Hull, 1949a) .

Figures

FIGURES 38–45. 38: Syrphus sargoides Macquart [male, DZUP-Diptera 342599], habitus, dorsal view. 39: Syrphus sargoides [female, GFGM-MNRJ0003], metafemur and metatibia, lateral view. Scale = 1 mm. 40: Baccha grata Curran [male, USNMENT 00022542], habitus, lateral view. Scale = 2 mm. Note: framed with white, a zoom-in of the antennae. 41: Baccha grata [male, USNM], male, habitus, lateral view. 42: Baccha grata [male, USNM], male, habitus, dorsal view. 43: Baccha grata [female, USNMENT 00022543], spermatheca. Scale = 100 µm. 44: Syrphus conjunctus, female, by Steve Marshall. 45: Ocyptamus dimidiatus (Fabricius) [female, INPA-DIP0000808], antenna. Scale = 0.2 mm. Note: Arrow indicates the narrow pedicel projection over the basoflagellomere.

FIGURES 46–54. 46: Pseudoscaeva diversifasciata (Knab), male, habitus, dorsal view, by Alice Abela. 47: Ocyptamus megafemur Thompson sp. nov. [male holotype, USNMENT 00249222], habitus, lateral view. Scale = 4 mm. 48: Ocyptamus megafemur Thompson sp. nov. [male holotype, USNMENT 00249222], head, frontal view. Scale = 1 mm. 49: Ocyptamus megafemur Thompson sp. nov. [male holotype, USNMENT 00249222], head, dorsal view. Note: Arrow indicates the mesonotal collar or fringe. 50: Ocyptamus megafemur Thompson sp. nov. [male holotype, USNMENT 00249222], habitus, dorsal view. Scale = 1 mm. 51: Pelecinobaccha transatlantica (Schiner) [female, INPA-DIP0000253], antenna. 52: Styxia eblis (Hull) [male, DEBU01088838], wing, lateral view. 53: Styxia eblis [paratype male, CNC No 19270], habitus, dorsal view. 54: Styxia eblis [male, DEBU01088838], head, frontal view.