Diglyphomorphomyia pilosa sp. nov.

Figs 15, 16, 21, 22, 31, 36

Diagnosis. Female with head and antennal flagellum dark brown to black, mesosoma yellowish-brown, gaster brown (Figs 15, 16), male with head and mesosoma dark brown to black (Figs 21, 22); fore wing infumate with part below stigmal vein slightly darker (Fig. 15); pronotal collar without a carina along anterior margin (Fig. 16); midlobe of mesoscutum with four pairs of setae (Fig. 16); mesoscutellum with sublateral grooves slightly sinuate in lateral part, not joining in posterior part (Figs 16, 22); fore wing with 25+ scattered setae on ventral surface of costal cell, and with 15 setae along apico-dorsal margin (Fig. 15).

Description (female holotype). Length 2.9mm. Frons and vertex with weak reticulation, antennal scrobes smooth. Pronotal collar without a carina along anterior margin. Mesoscutum with weak reticulation; midlobe with four pairs of setae, three pairs are long and strong and one pair is short and weak. Mesoscutellum, axillae, dorsellum and propodeum smooth, without reticulation; mesoscutellum with sublateral grooves not joining in posterior part; propodeal callus with nine setae. Fore wing with nine setae on dorsal surface of submarginal vein; with 17 admarginal setae; costal cell with 25+ scattered setae on ventral surface, apico-dorsal margin with 15 setae. Gaster elongate.

Colour. Head dark brown to black. Antennae with scape yellowish-brown, pedicel pale brown, and flagellum dark brown. Mesoscutum, mesoscutellum, dorsellum and propodeum yellowish-brown. Fore leg with coxa and trochanter white, femur pale brown, tibia and tarsus yellowish-brown; mid and hind legs yellowish-brown. Wings infumate, fore wing with part below stigmal vein slightly darker. Petiole yellowish-brown. Gaster with Gt 1 pale brown, remaining tergites dark brown.

Relative measurements. Head: length in dorsal view 27; length in frontal view 39; width 55; POL 10.5; OOL 8; mouth width 21; malar space 11; eye height 26; lateral ocellus maximum width 5; scape length 20.5; scape width 5; pedicel length 8.5; pedicel width in dorsal view 4.2; pedicel+flagellum length 65; F1 length 12; F2 length 11; F3 length 9.5; F4 length 8.5; antennal clava length 14.5; F1 width 5.5; F2 width 6; F3 width 7; F4 width 7; antennal clava width 7.5. Mesosoma: length 84; width 48; midlobe of mesoscutum length 28; mesoscutellum length 30; mesoscutellum width 25.5; dorsellum length 2.5; propodeum length 19; mid tarsus length 28; mid tarsus T4 length 6.5; hind tarsus length 30; hind tarsus T4 length 7; fore wing length 120; fore wing width 67; costal cell length 46; costal cell width 4; marginal vein length 46; postmarginal vein length 20; stigmal vein length 17. Gaster: length 102; width 51; Gt 1 length 34; Gt 7 length 8; Gt 7 width 10.

Male. Length 1.7–2.0mm. Mesosoma, pedicel, gaster, mid and hind coxae dark brown. Fore wing with ten setae along apico-dorsal margin of costal cell. Otherwise as in female.

Relative measurements. Head: length in dorsal view 22; length in frontal view 33; width 45; POL 8; OOL 5; mouth width 18; malar space 7.5; eye height 23; scape length 17; scape width 4; pedicel+flagellum length 52; F1 length 8.5; F2 length 8.5; F3 length 8.5; F4 length 7.5; antennal clava length 13; F1 width 5; F2 width 6; F3 width 6.5; F4 width 6.5; antennal clava width 6.5. Mesosoma: length 67; width 39; midlobe of mesoscutum length 25; mesoscutellum length 23.5; mesoscutellum width 20; dorsellum length 3; propodeum length 15. Gaster: length 65; width 35; Gt 1 length 28.

Distribution. Costa Rica.

Etymology. From the Latin pilosa = hairy, referring to the hairy costal cell.

Material. Holotype female: COSTA RICA, Puntarenas, Estación Altamira, Sendero a Casa Coca, 9º02’N, 83º00’W, 1450–1700m, 7.ii–5.iii.2002, C. Hansson & Parataxonomos (MZLU) . Paratypes (2♂, NHMUK): 1♂ COSTA RICA, Puntarenas, San Vito, Las Cruces, Wilson Botanico, 8º46’N, 82º57’W, 1150–1300m, 18–22.iii.1990, J.S. Noyes ; 1♂ from same locality as previous but collected 15–16.ii.2012 .