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. .. , Face and scutellum entirely black in ground color (Fig. 4A, D); metasternum greatly reduced, with deep anterior incision on each side (as in Fig. 9C)

. Fig, D. 3b, and F. ). , 8 -Face entirely yellow (Fig. 3H); metasternum bare; abdomen distinctly marginated on terga 2-5 (Figs 2D, 3G, 5F)

, Simosyrphus grandicornis Macquart, 1842 * -Katepisternum with a dorsal yellow macula (Fig. 3G); scutellum with pale pile only; male metatrochanter with a ventral spine-like process or calcar (Fig. 6A), Katepisternum without a dorsal yellow macula but densely pollinose (Fig

. .. , , p.1805

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. Fig, C. ). 7a, and D. ). 7b, polynesiotes sp. nov. -Abdominal terga with large orange or yellow abdominal markings; male abdomen almost entirely orange with apical margins narrowly black and genitalic segments black (Figs 7B, D, 9B); female abdomen with pairs of large, narrowly separated pale maculae (Figs 7F, 8A); legs all orange, rarely metatibia with an indistinct medial brown band (Fig. 7B, E), almost straight (Figs 4D, 7D, 9A); male genitalia greatly enlarged, usually visible externally (Figs 6G

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