Philhelius Stephens, 1841 Stephens 1841

Philhelius Stephens, 1841 Philhelius Stephens, 1841 Stephens (1841): 201. Type species: Syrphus ornatus Meigen, 1822 = Philhelius pedissequus Harris, 1788. Xanthogramma Schiner, 1861 Schiner (1861): 318. Type species: Syrphus ornatus Meigen, 1822 = Philhelius pedissequus Harris, 1758. Synonymised by Evenhuis (2018): 51 –52. Olbiosyrphus Mik, 1897 Mik (1897): 66. Type species: Syrphus laetus Fabricius, 1794. Synonymised by Vockeroth (1969): 90. Syrphus ornatus Meigen, 1822 Diagnosis The members of the genus Philhelius can be distinguished from other syrphid taxa by the following combination of characteristics [modified from Vockeroth (1969) and Thompson and Rotheray (1998)]: (1) postpronotum bare; (2) scutum predominantly black with distinct yellow lateral margins (Fig. 1 A); (3) scutellum with the anterior half black and posterior half yellow approximately (Fig. 1 A); (4) pleura predominantly black with yellow spots (Fig. 3); (5) dorsal and ventral katepisternal hair patches separated; (6) in male genitalia, postgonite relatively narrow and short, apico-dorsally with a long pointed upward hook (Fig. 4 C); and (7) hypandrial lingula absent (Fig. 4 C) and anteriorly with narrow concave corner in ventral view.