Pseudoscaeva Vockeroth, 1969

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 : 14

Genus Pseudoscaeva Vockeroth, 1969 stat. rev.

Fig. 46 .

Pseudoscaeva Vockeroth, 1969: 123 , as a genus. Type species: Syrphus diversifasciatus Knab, 1914 (original designation). Ocyptamus (Pseudoscaeva) . Mengual et al. (2012).

Ocyptamus diversifasciatus species group. Miranda et al. (2016).

Diagnosis. Dorsal occiput with 2–3 rows of pile. Mostly bare wings. Abdominal terga with pale fasciate maculae over black dull fasciae.

Comments. As the name suggests, this genus is superficially similar to Scaeva , having distinct bare areas on the wings (nowhere else among the groups studied here does the wing have such extensive bare areas). They have wide faces and frons, and the female ocellar triangle is distinctly distanced from the eye margin, and overall appearance reminds one of Orphnabaccha . A close phylogenetic relationship between Orphnabaccha and Pseudoscaeva based on morphological characters was already pointed out by Vockeroth (1969), although the metasternum is bare in Pseudoscaeva .

Species list (4): P. diversifasciata ( Knab, 1914) , P. meridionalis ( Fluke, 1950b) , P. schoenemanni ( Enderlein, 1938) , P. sericea ( Walker, 1836) .

Figures

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.