Galeopsomyia gallarum Hansson sp.nov.

(Figs 114, 115, 956, 1018)

Diagnosis (female). Antennal clava solid (Fig. 1018); genal carina absent; mesoscutum (Fig. 114) with strong reticulation and mesoscutellum with weak reticulation, meshes elongate; hind coxa with a carina along posterior margin; propodeum (Fig. 114) with a long and narrow median carina; gaster (Fig. 114) 2.2× as long as wide, with short Gt 2, 0.1× as long as wide, and Gt 4 0.4× as long as wide, Gt 2 0.3× as long as Gt 4, medio-basal Gt 1 without transverse edge or carina dorsally, with weaker reticulation and more shiny than remaining tergites.

Female holotype: length of body 2.0mm (paratypes 1.4–1.8mm).

Scape yellowish-brown, pedicel and flagellum dark brown. Head with frons, including scrobes, and vertex metallic bluish-green, clypeus black. Mesoscutum and mesoscutellum metallic greenish-blue, propodeum golden-green. Legs with fore and mid coxae dark brown, hind coxa metallic bluish-green; trochanters pale brown; fore and mid femora dark brown with apical tip yellowish-brown, hind femur black with metallic tinges with apical tip yellowish-brown; tibiae yellowish-brown; T1–3 yellowish-brown, T4 brown. Petiole black. Gaster metallic bluish-green; gonoplac black.

Antenna with solid clava. Frons with strong reticulation, clypeus smooth, antennal scrobes with weak reticulation; genal carina absent. Vertex with strong reticulation outside ocellar triangle, with wrinkled sculpture inside ocellar triangle.

Mesoscutum with strong reticulation, meshes isodiametric on sidelobes, elongate on midlobe; midlobe without median groove, with six scattered adnotaular setae. Mesoscutellum with weak reticulation, meshes elongate; submedian grooves indistinct, far apart, straight and slightly diverging towards posterior part; anterior pair of setae placed in the middle of mesoscutellum. Dorsellum with strong reticulation. Propodeum with a strong, long and narrow median carina; callus with three setae. Fore and hind coxae with strong reticulation, mid coxa with weak reticulation; hind coxa with a carina along posterior margin. Fore wing with four setae on dorsal surface of submarginal vein; speculum open below; costal setal row unbroken.

Petiole very short, just a narrow band. Gaster elongate; medio-basal Gt 1 without transverse edge or carina dorsally, with weak reticulation and shiny, remaining tergites with strong reticulation.

Relative measurements: head length, dorsal view 21; head length, frontal view 35; POL 11; OOL 5.2; lateral ocellus diameter 4; head width 46; mouth width 15; malar space 13; eye length 20; scape length 16; scape width 4; pedicel+flagellum length 41; pedicel length 7; pedicel width, dorsal view 3.6; F1 length 6; F1 width 5; F2 length 5.5; F2 width 5; F3 length 5; F3 width 5; clava length 14.5; clava width 5.5; C3 length 4; spicule length 1; mesosoma length 58; mesosoma width 42; midlobe of mesoscutum length 23; mesoscutellum length 20.5; mesoscutellum width 21.5; median part of mesoscutellum width (measured medially) 11; median part of mesoscutellum, width in anterior part10.5; median part of mesoscutellum, width in posterior part 11.5; lateral part of mesoscutellum, width (measured medially) 4; dorsellum length 3; propodeum length 9; costal cell length 31; costal cell width (measured at widest part) 2; marginal vein length 25; stigmal vein length 10; gaster length 82; gaster width 37; Gt 2 length (measured medially) 4; Gt 4 length (measured medially) 16; Gt 7 length (measured medially) 6; Gt

7 width (measured at base) 11; longest cercal seta length 9.5; shortest cercal seta length 5. Male. Length of body of body 1.0– 1.3mm.

Antenna (Fig. 956) with scape narrow at very apex, slightly expanding from base to plaque; plaque dark brown; dorso-basal whorls of long setae present on F1–F4 and on C1. Gaster long ovate. Otherwise as in female.

Relative measurements: head length, dorsal view 12.5; head length, frontal view 23.5; head width 28; mouth width 8.5; malar space 8; eye length 12.5; scape length 10; scape width 3.5; plaque length 3.5; pedicel length 4.5; pedicel+flagellum length 41; F1 length 3.5; F1 width 3.5; F2 length 5; F2 width 3.5; F3 length 6; F3 width 3.5; F4 length 6; F4 width 3; clava length 15; clava width 3; mesosoma length 31; mesosoma width 22; gaster length 36; gaster width 13.5; longest subbasal seta on F1, length 23.

Hosts. Reared from fruit galls (probably induced by Cecidomyiidae) on Ludwigia sp. ( Onagraceae). In a dissected gall, a cecidomyiid larva was found together with several hymenopteran pupae (I. Jiménez, personal communication).

Distribution. Costa Rica.

Material examined.

Holotype ♀ COSTA RICA, Heredia, Santo Domingo, INBio-Parque, 12.ii.2011, J.S. Noyes (NHMUK) . Paratypes (5♀ 3♂, MZLU, MZUCR, NHMUK): 1♀ COSTA RICA, Guanacaste, Estación Pitilla, ACG, LN532600_380600, 30.i-4.ii.2001, R. Thomas, C. Moraga ; 3♀ 3♂ COSTA RICA, Guanacaste, La Cruz, Rio Sapoá, ex Ludwigia fruit galls, I. Jiménez [no date given] ; 1♀ COSTA RICA, Limón, Parque Nacional Cahuita, 09º43’N, 82º49’W, 24.ii.2010, J.S. Noyes .

Etymology. From the Latin galla = gall, and the suffix - arum = from.