Eriastichus nugalis, Hansson, 2021

Hansson, Christer, 2021, The genus Eriastichus La Salle (Hymenoptera, Eulophidae, Tetrastichinae) in the Neotropical region, introducing 48 new species, ZooKeys 1019, pp. 35-91 : 35

Eriastichus nugalis sp. nov. Figure 45

Type locality.

Costa Rica, Cartago, Humo, El Copal, 9°47'N, 83°45'W, 1050-1250 m, 29.ii-6.iii.2008, C. Hansson leg.

Type specimen.

Holotype male dried and glued to a paper card. Original labels: "Costa Rica, Cartago, Humo, El Copal, 9°47'N, 83°45'W, 1050-1250 m, 29.ii-6.iii.2008, C. Hansson", "HOLOTYPE Eriastichus nugalis Hansson" [red printed label], (MZLU:7042.1).

Additional type material.

Paratypes (2♂♂): 1♂ with same label data as holotype (MZLU:7042.2); 1♂ "COSTA RICA, Puntarenas, San Vito, E.B. Las Alturas, 1500 m, 8°57'N, 82°50'W, 17-18.ii.2012, J.S. Noyes, NHM (Ent) 2012-91" (NHMUK014431057).

Diagnosis

(male). Head dark brown, scape yellowish brown, pedicel pale brown, flagellum dark brown; ventral plaque on scape ca. 0.4 × as long as scape (Fig. 45 ), antenna with dorsobasal setae on F1 0.5 × as long as F1; gaster with lateral tufts of pale and flattened setae on Gt6.

Description

(male holotype MZLU:7042.1). Length of body 1.8 mm (paratypes 1.5-1.6 mm). Head dark brown, scape yellowish brown, pedicel pale brown, flagellum dark brown, ventral plaque dark brown. Mesoscutum, mesoscutellum and propodeum dark brown, dorsellum pale brown. Legs with fore and mid coxae yellowish brown with base brown, hind coxa, remaining parts of legs yellowish brown. Gaster dark brown.

Head. Length/width in frontal view 0.8; width/length in dorsal view 2.1; POL/OOL 1.8; WM/MS 1.9; MS/HE 0.5; HE/head length in frontal view 0.6; widths head/mesoscutum 1.1. Antenna. Pedicel + flagellum length/mesoscutum width 2.1; pedicel + flagellum length/head width 1.9; lengths scape/ventral plaque 2.5; ventral plaque located in the middle of scape; scape length/width 3.0; lengths scape/head (dorsal view) 0.6; scape length/HE 0.9; length/width F1, F2, F3, F4, clava: 2.5, 2.5, 2.5, 2.5, 5.5; length dorsobasal setae on F1/length F1 0.5. Mesosoma. Length/width 1.6; mesoscutum length/width 0.6; mesoscutellum length/width 0.8; widths SMG/SLG 1.0; enclosed space between SMG length/width 2.3; lengths mesoscutum/mesoscutellum 1.4; lengths mesoscutellum/dorsellum 2.8; lengths mesosoma/gaster 0.7. Wings. CC length/width 30.0; lengths CC/MV 1.1; lengths MV/ST 1.9; lengths MV/PM 4.9; lengths PM/ST 0.4; submarginal vein with eight setae on dorsal surface (paratypes with seven setae). Gaster. With lateral tufts of pale and flattened setae on Gt6.

Figures

Figures 41 - 50. Eriastichus spp. head and antenna in lateral view, male holotypes 41 E. nexilis 42 E. oasis 43 E. ononis 44 E. novalis 45 E. nugalis 46 E. parabilis 47 E. rivalis 48 E. sodalis 49 E. orestis 50 E. pallidops.