Horismenus gabrielae Hansson, 2019

Hansson, Christer, Kenyon, Sarah G. & Benrey, Betty, 2019, Species of Horismenus Walker (Hymenoptera: Eulophidae) associated with bruchid beetles (Coleoptera: Chrysomelidae: Bruchinae), including five new species, Zootaxa 4585 (1), pp. 168-188 : 185

Horismenus gabrielae Hansson sp. nov.

Figs 72–77

Diagnosis. Antennal scrobes join below frontal suture; female flagellomeres short and stout ( Fig. 76 ), 1 st flagellomere as long as wide, 2–3 transverse; male scape dark and 2.4× as long as wide ( Fig. 77 ); scutellum flattened and smooth and shiny ( Fig. 75 ); propodeum with median carina with sides straight and diverging towards posterior part, and with anterior part blunt ( Fig. 75 ); first gastral tergite with posterior ¼ with engraved reticulation ( Fig. 74 ). In the key in Hansson (2009), H. gabrielae runs either to H. dryas (couplet F38) from which it differs in having much longer female gaster and shorter petiole (male is unknown in H. dryas ), or to H. carolinensis (couplet F57) from which it differs in having a much longer gaster in female (male is unknown in H. carolinensis ) and with sides of median carina on propodeum straight and diverging towards posterior part ( H. carolinensis with sides of carina rounded and converging in posterior part).

Description. FEMALE. Length 2.0– 2.3 mm. Scape yellowish-brown; pedicel and flagellum dark brown with metallic tinges. Frons golden. Vertex golden-green. Mesoscutum black with golden tinges, scutellum black, propodeum black with golden-green tinges. Coxae black with metallic bluish-green tinges; femora dark brown, tibiae and tarsi yellowish-white, 4 th tarsomere dark brown. Wings hyaline. Petiole metallic dark purple. Gaster with reticulate parts metallic dark purple, smooth and shiny parts black with golden-green tinges.

Antenna as in Fig. 76 . Frons with interscrobal and clypeal area smooth, part just above frontal suture with raised and weak reticulation, remaining parts with raised and strong reticulation; frontal suture V-shaped and complete; antennal scrobes join below frontal suture. Vertex with engraved and strong reticulation; with a median groove in posterior part, groove continues down on occiput. Occipital margin rounded.

Mesoscutum with engraved reticulation; notauli as narrow and distinct grooves throughout. Scutellum flattened, smooth and shiny with very weak traces of reticulation in some places. Dorsellum smooth, with a row of pits along anterior margin. Coxae smooth with very weak engraved reticulation. Propodeum smooth and shiny, submedian grooves reticulate, anterolateral foveae reticulate but indistinctly delimited; propodeal callus with 3 setae. Forewing speculum closed below; with 17 admarginal setae.

Gaster with first tergite smooth and shiny in anterior ¾, posterior ⅓ with engraved reticulation.

Ratios. DE/DO 5.1; WH/DE 2.0; HE/MS/WM 1.8/1.0/1.4; POL/OOL/POO 4.0/1.4/1.0; WH/WT 1.1; LW/ LM/HW 1.7/1.0/1.0; PM/ST 0.8; LC/WC 2.7; WG/WC 0.5; LS/LT 0.12; LP/WP 0.4; MM/LG 0.6–0.7.

MALE. Length 1.4–1.7 mm. Frons metallic bluish-purple. Vertex metallic blue. Colour otherwise as in female. Antenna as in Fig. 77 ; scape dark brown, inflated and 2.4× as long as wide. Head and mesosoma as in female.

Ratios. HE/MS/WM 2.1/1.0/1.4; LP/WP 1.0; MM/LG 1.6.

Distribution. Mexico.

Hosts. Reared from an unidentified species of Bruchinae ( Coleoptera : Chrysomelidae ) on Leucaena sp. ( Fabaceae ).

Type material. Holotype female labelled “ MEXICO: Chetumal, Quintana Roo, December 2017, G. Pérez- Lachaud ”, “ Bruchidae , in seeds of Leucaena tree”, in NHM . Paratypes. 4♀ and 4♂ with same label data as holotype, mounted on cards ( ECO-CH-AR, MZLU, NHM) .

Etymology. Named after Gabriela Pérez-Lachaud, the collector of the type material.

Figures

FIGURES 72–77. Horismenus gabrielae sp. nov.; 72, body lateral female holotype; 73, body lateral male paratype; 74, gaster dorsal, female; 75, mesosoma dorsal, female; 76, head and antenna lateral, female; 77, head and antenna lateral, male.