Grotiusomyia jimenezi sp. nov.

Figs 9, 31, 57, 84, 102

Diagnosis. Mandibles yellowish-brown, with a large tooth at apex and with a row of small teeth above large tooth (as in Fig. 111); flagellum dark brown, 0.8× as long as width of mesoscutum, F4 0.7× as long as wide, apex of clava pointed (Figs 9, 57); frons between scrobes and eyes and vertex with strong reticulation (Figs 84, 102); occipital margin with an edge behind ocellar triangle (Fig. 84); mesoscutum and mesoscutellum with same colour and reticulation (Fig. 31); mesoscutellum convex; dorsellum flat, smooth and shiny, posterior margin with postero-median part slightly protruding and with parts lateral to median part slightly incised; fore wing completely hyaline, with six setae in apico-dorsal part of costal cell (Fig. 9); fore and mid coxae dark brown (Fig. 9); gaster (Fig. 31) 1.6× as long as wide; Gt 1 0.3× as long as length of gaster, dorsal surface smooth, posterior margin straight; Gt 6 0.1× as long as length of gaster with anterior part 2.4× as wide as width of posterior part, posterior margin straight with sharp edge.

Description (female holotype). Length 1.6 mm. Frons between scrobes and eyes and vertex with strong reticulation, scrobes smooth. Mandibles with a large tooth at apex and with a row of small teeth above large tooth. Occipital margin with an edge behind ocellar triangle. Dorsellum flat, smooth and shiny, posterior margin with postero-median part slightly protruding and with parts lateral to median part slightly incised. Propodeal callus with ten setae. Fore wing with six setae on dorsal surface of submarginal vein; with 17 admarginal setae; costal cell with 16 setae on ventral surface, partly in two rows, apico-dorsal margin with six setae; speculum distinct and closed below. Gaster long ovate; Gt 1 smooth and shiny without sculpture, remaining tergites with weak reticulation; Gt 1 with posterior margin straight,Gt 6 with posterior margin pointing slightly backwards.

Colour. Head black with metallic blue tinges, scrobes black. Mandibles yellowish-brown. Antennae with scape yellowish-brown, pedicel pale brown, flagellum dark brown. Mesosoma black with metallic bluish tinges. Legs with fore and mid coxae dark brown, hind coxa black with metallic tinges, trochanters yellowish-brown, fore femur yellowish-brown, mid and hind femora dark brown, tibiae and tarsi yellowish-brown. Gt 1 black with metallic blue tinges, remaining tergites dark brown to black with metallic tinges.

Relative measurements: head length, dorsal view 18; head length, frontal view 31; head width 41; POL 9.5; OOL 4.5; mouth width 12; malar space 5.5; eye length 23; lateral ocellus diameter 4; scape length 14; scape width 3; pedicel length 5; pedicel width. dorsal view 3.5; flagellum length 26.5; F1 length 4; F1 width 4; F2 length 4; F2 width 5; F3 length 4.5; F3 width 6; F4 length 4; F4 width 6; clava length 9; clava width 6; pronotum length 14; pronotum width 29; mesosoma length 56; mesosoma width 35; midlobe of mesoscutum length 20; mesoscutellum length 17; mesoscutellum width 17.5; propodeum length 10; hind tibia length 31; hind tibial spur1 length 5; hind tibial spur2 length 3; hind tarsus length 22; hind basitarsus length 5.5; fore wing length 88; fore wing width 40; costal cell length 27; costal cell width 2; marginal vein length 27; postmarginal vein length 12; stigmal vein length 9.5; Gt 1 length 19; Gt 6 length 8; Gt 6 width at base 20; Gt 6 width at apex 8.5; gaster length 57; gaster width 35.

Male. Unknown.

Distribution. Costa Rica.

Etymology. Named in honor of Iván Jimenez, collector of holotype.

Material. Holotype female: COSTA RICA, Guanacaste, Bosque Nacional Diriá, Retallano, Alrededores Torre de Control de Incendio, LN 238550_358650, 600-700m, 16.xii.2001 - 16.i.2002, I. Jiménez (NHMUK).