Horismenus depressoides, Hansson & Kenyon & Benrey, 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: 170-174

publication ID


publication LSID


persistent identifier


treatment provided by


scientific name

Horismenus depressoides

sp. nov.

Horismenus depressoides   sp. nov.

Figs 5–8 View FIGURES 1–8 , 9–12 View FIGURES 9–12 , 13, 15 View FIGURES 13–16

Diagnosis. Antennal scrobes join below frontal suture ( Figs 9, 10 View FIGURES 9–12 ); female flagellomeres short and stout ( Fig. 7 View FIGURES 1–8 ), e.g. 1 st flagellomere 2.4× as long as wide; male scape 3.7× as long as wide ( Fig. 8 View FIGURES 1–8 ); forewing speculum open below; scutellum flat with posteromedian part smooth and shiny ( Fig. 12 View FIGURES 9–12 ); propodeum with median carina with sides rounded and converging towards posterior part, and with anterior part blunt ( Figs 12 View FIGURES 9–12 , 13 View FIGURES 13–16 ); first gastral tergite with posterior ¾ with punctures. Very similar to H. depressus   but differs in having a larger propodeal spiracle ( Fig. 13 View FIGURES 13–16 ), female gaster with apex distinctly more blunt ( Fig. 15 View FIGURES 13–16 ), and entire thoracic dorsum bright metallic bluish-green ( Fig. 6 View FIGURES 1–8 ), with or without purple tinges.

Description. FEMALE. Length 2.0– 2.1 mm. Scape yellowish-white with apical ¼ metallic bluish-green; pedicel and flagellum metallic bluish-green. Frons metallic bluish-green. Vertex metallic bluish-green. Mesosoma metallic bluish-green with purple tinges, propodeum with smooth parts metallic bluish-green, reticulate parts metallic dark purple. Coxae metallic bluish-green; femora, tibiae and tarsi yellowish-white. Wings hyaline. Petiole metallic dark purple. Gaster with first tergite metallic bluish-green in anterior ⅓, metallic dark purple in posterior ¾; remaining tergites metallic dark purple.

Antenna as in Fig. 7 View FIGURES 1–8 . Frons with interscrobal area smooth, clypeal area and part just above frontal suture with raised and weak reticulation, remaining parts with raised and strong reticulation; frontal suture V-shaped, incomplete not reaching eyes; 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 raised and strong reticulation, midlobe with posteromedian ¼ with engraved reticulation; notauli as narrow and distinct grooves medially. Scutellum flat, with engraved and weak reticulation, partly to predominantly smooth. Dorsellum smooth, anterolaterally with two large foveae. Coxae smooth and shiny. Propodeum smooth and shiny, submedian grooves reticulate; propodeal callus with 2–3 setae. Forewing speculum open below; with 12–13 admarginal setae.

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

Ratios. DE/DO 5.0; WH/DE 2.1; HE/MS/WM 3.6/1.0/2.2; POL/OOL/POO 8.3/2.8/1.0; WH/WT 1.1; LW/ LM/HW 1.7/1.0/1.0; PM/ST 0.8; LC/WC 3.9; WG/WC 0.5; LS/LT 0.21; LP/WP 1.1; MM/LG 1.1.

MALE. Length 1.9–2.1 mm. Frons metallic purple. Vertex golden-green. Colour otherwise as in female. Antenna as in Fig. 8 View FIGURES 1–8 . Head and mesosoma as in female.

Ratios. HE/MS/WM 3.2/1.0/2.0; LP/WP 1.4; MM/LG 1.2.

Distribution. Honduras, Mexico.

Hosts. Larvae of Acanthoscelides obtectus   and Acanthoscelides   sp. ( Coleoptera   : Chrysomelidae   : Bruchinae) on Phaseolus vulgaris   ( Fabaceae   ).

Type material. Holotype female labelled “ MEXICO, Est. Mexico, Temascaltepec , 100°02'730''W 19°02'584''N, 1750 m, 21.xii.2001 - 2.iii.2002, A. Aebi ”, “Ex Acanthoscelides   sp. on Phaseolus vulgaris   ”, in MZLU   . Paratypes. 22♀ and 22♂ mounted on cards (in MZLU & NHM)   . HONDURAS. Francisco Morazán: San Antonio de Oriente, El Zamorano , 8.ii.1990, L. Vazquez, from larva of Acanthoscelides obtectus   on Phaseolus vulgaris   (6♀ 6♂)   . Mexico: with same label data as holotype (3♀ 4♂)   , and from same locality and same host but collected 16.xii.2001 - 3.ii.2002 (1♀ 2♂)   ; Valle de Bravo, 100°08'985''W 18°55'85''N, 1950 m, 1.i-15.ii.2002, A. Aebi, from Acantoscelides sp. on Phaseolus vulgaris   (1♀ 1♂)   ; Tejupilco , 99°07'270''W 18°59'603''N, 1400 m, 21.xii.2001 - 2.ii.2002, A. Aebi, from Acanthoscelides   sp. on Phaseolus vulgaris   (5♀ 3♂)   . Michoacan: Paso Real , 101°44'359''W 19°06'769''N, 1490 m, 10.ii.2002, A.Aebi (1♀ 2♂)   : Morelos: San José de los Laureles , 99°00'005''W 18°58'497''N, 1855 m, 19.xii.2001 - 3.ii.2002, A. Aebi, from Acanthoscelides   sp. on Phaseolus vulgaris   (1♀ 1♂)   , and from same locality and same host but collected 5.i-23.ii.2003 (4♀ 4♂)   ; Tepoztlan , 99°07'2705''W 18°59'603''N, 1870 m, 16.xii.2001 - 3.ii.2002, A. Aebi, from Acanthoscelides   sp. on Phaseolus vulgaris   (2♀ 1♂)   , 5♀ 7♂ from same locality as previous, from A. obtectus   and collected 31.iii.1980   .

Etymology. Named after similarity to H. depressus   , with the Greek suffix - eides = like.

Molecular data. Horismenus depressoides   equals “HD3” in Kenyon et al. (2015) and molecular data associated with “HD3” is accounted for in that paper.

Remarks. H. depressoides   is very similar to H. depressus   and has previously been mixed-up with this species ( Hansson et al. 2004, Hansson 2009). Due to the difficulty in separating these two species the distributional and biological records presented here include only specimens that have been examined for this manuscript.


Sweden, Lund, Lund University