Grotiusomyia flavicornis Girault

Figs 1, 27, 46, 76

Grotiusomyia flavicornis Girault, 1917:95 . Syntypes in USNM, not examined.

Diagnosis. Mandibles yellowish-brown with a row of small teeth at apex; flagellum yellowish-brown, 0.6× as long as width of mesoscutum, F4 0.6× as long as wide, apex of clava pointed (Figs 1, 46); frons between scrobes and eyes and vertex (Fig. 76) with strong reticulation; occipital margin with an edge behind ocellar triangle (Fig. 76); mesoscutum and mesoscutellum with same reticulation (Fig. 27); mesoscutellum convex with purplish tinges; dorsellum slightly convex with very lateral parts and medioposterior part concave, smooth and shiny; fore wing with five setae in apico-dorsal part of costal cell, completely hyaline (Fig. 1); fore and mid coxae black (Fig. 1); gaster (Fig. 27) 1.7× as long as wide with apex pointed; Gt 1 0.4× as long as length of gaster, smooth, posterior margin slightly curved forwards; Gt 6 0.2× as long as length of gaster with anterior part 1.7× as wide as width of posterior part, posterior margin straight with sharp edge.

Distribution. U.S.A. (District of Columbia (Girault 1917), North Carolina (Peck 1963), Iowa (new record).

Hosts. Unidentified Pyralidae (Lepidoptera) on Quercus (Girault 1917) .

Material. Non-type material (1♀, in NHMUK): USA, Iowa, Audubon Co., 16.viii.1952 (det. Burks 1953) .