Galeopsomyia briannestjacquesae Hansson & Hanson 2023, sp.nov.

Galeopsomyia briannestjacquesae Hansson sp.nov.

(Figs 314, 315, 1062)

Diagnosis (female). Antenna with a weak constriction between C1 and C2 (Fig. 1062); genal carina present close to mouth opening; mesoscutellum (Fig. 314) flattened and 0.8× as long as wide, with weak reticulation on median part and with an indistinct ±complete median groove, lateral parts with strong reticulation, meshes elongate, submedian grooves distinct in posterior half, with outer margin indistinct in anterior half, slightly curved and diverging towards posterior part; dorsellum without median carina; propodeum (Fig. 314) with strong reticulation, callus with two setae; gaster (Fig. 314) 1.8× as long as wide, tergites with strong reticulation, gonoplac short, with apex pointed (Fig. 315); body black, head, mesoscutellum, propodeum and Gt1 with metallic tinges (Fig. 314).

Female holotype: length of body 2.0mm.

Scape yellowish-brown, pedicel pale brown, flagellum dark brown. Head black with metallic tinges, clypeus dark brown. Mesosoma black, median part of mesoscutellum and propodeum with metallic tinges. Legs with fore and hind coxae black with metallic tinges, mid coxa dark brown; trochanters dark brown; femora dark brown with apex yellowish-brown; tibiae yellowish-brown; T1–3 yellowish-brown, T4 brown. Petiole black. Gaster with Gt1 black with metallic tinges, remaining tergites black with purplish tinges; gonoplac black with apex yellowish-brown.

Antenna with a weak constriction between C1 and C2. Face below level of toruli with weak reticulation, clypeus smooth, frons with strong reticulation, antennal scrobes with weak reticulation; with genal carina. Vertex with strong reticulation outside ocellar triangle, with strong wrinkled sculpture inside ocellar triangle.

Mesoscutum with strong reticulation, meshes isodiametric on sidelobes, slightly elongate on midlobe; midlobe with an indistinct but ±complete median groove, adnotaular setae mainly broken off. Mesoscutellum flattened, with weak reticulation on median part and an indistinct ±complete median groove, lateral parts with strong reticulation, meshes elongate; submedian grooves distinct in posterior half, with outer margin indistinct in anterior half, slightly curved and diverging towards posterior part; setae on lateral parts mainly broken off. Dorsellum with strong reticulation, without median carina. Propodeum with a strong and narrow median carina that expands in posterior one-third; propodeum with strong reticulation; callus with two setae. Fore and hind coxae with strong reticulation, mid coxa with weak reticulation. Fore wing with three setae on dorsal surface of submarginal vein; speculum closed; costal setal row broken.

Petiole transverse with strong sculpture on dorsal part. Gaster ovate; tergites with strong reticulation.

Relative measurements: head length, dorsal view 22; head length, frontal view 36; POL 9; OOL 6; lateral ocellus diameter 4; head width 51; mouth width 15; malar space 13.5; eye length 21; scape length 19; scape width 4; pedicel+flagellum length 57; pedicel length 7; pedicel width, dorsal view 3.5; F1 length 10; F1 width 4.5; F2 length 10; F2 width 4.5; F3 length 9; F3 width 5; clava length 18.5; clava width 5.5; C3 length 6; spicule length 1.5; mesosoma length 64; mesosoma width 45; midlobe of mesoscutum length 22; mesoscutellum length 21; mesoscutellum width 26; median part of mesoscutellum width (measured medially) 8; median part of mesoscutellum, width in anterior part 8.5; median part of mesoscutellum, width in posterior part 10; lateral part of mesoscutellum, width (measured medially) 5.5; dorsellum length 3.5; propodeum length 10; costal cell length nm; costal cell width (measured at widest part) 2.5; marginal vein length 32; stigmal vein length 9.5; gaster length 76; gaster width 42; Gt 2 length (measured medially) 10; Gt 4 length (measured medially) 16; Gt 7 length (measured medially) 10; Gt

7 width (measured at base) 15; longest cercal seta length 11; shortest cercal seta length 5.

Male. Unknown.

Hosts. Unknown.

Distribution. Costa Rica.

Material examined.

Holotype ♀ COSTA RICA, Guanacaste, Area de Conservacion, Guanacaste, Sector Pailas, Pailas Dos PL 12-9, 10º76’N, 85º33’W, 809m, 14-21.xii.2017, D. Janzen, W. Hallwachs (barcoded specimen: BIOUG58920 -B07) (MZLU).

Etymology. Named in honour of Brianne St. Jacques in recognition of her years of dedicated management of Costa Rica’s data at the Centre for Biodiversity Genomics, Ontario, Canada.