Orseolia graminis

Orseolia graminis (Kieffer & Docters van Leeuwen-Reijnvaan)

[Figs 26 c–d]

Courteia graminis Kieffer & DvLR, 1910: 131.

Orseolia graminis (Kieffer & DvLR): Gagné (1973: 507), new combination; Gagné (1985: 143) (revision).

Type series. Type female, now likely lost, was reared from Ottochloa nodosa (Kunth) Dandy (as Panicum nodosum Kunth) (Poaceae) in Salatiga, Java, 10-iv-1909.

Description. Female. The only relevant descriptive characters given in Kieffer & DvLR (1910) are that the fly is large, 3.5 mm long, and has a 2-segmented palpus. Their single drawing of the two last flagellomeres is shown here [Fig. 26d].

Male, pupa, larva unknown.

Biology. Kieffer & DvLR (1910) and DvLR & DvL (1926, gall No 64, Fig. 38) [Figs 26c] describe the gall as a hairy, 8 mm long and 3 mm wide, leaf sheath on Ottochloa nodosa (as Panicum trigonum Retz.) (Poaceae). The sheath does not grow into a long tube, but remains short, oval at base and pointed towards the tip. The leaf blade is often rudimentary at the top of the gall or totally missing [Fig. 26c]. Galls develop at the end of the stem or out of a side bud. The type female emerged 10-iv.

Geographical distribution. This species is known from Java: Salatiga, alt. 600 m, i-1909; Mt Ungaran, alt. 1000 m, v-1910; Bogor, Botanic Gardens, alt. 250 m, v-1920; Ngarengan, near Semarang, alt. 40 m, ii-1920; Cigombong, near Bogor, alt. 400 m., iv-1925.