Horismenus dennoi, 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: 174-175

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Horismenus dennoi

sp. nov.

Horismenus dennoi   sp. nov.

Figs 17–21 View FIGURES 17–24 , 25–29 View FIGURES 25–29 , 35, 38, 41 View FIGURES 34–42

Diagnosis. Antennal scrobes join below frontal suture ( Figs 25, 26 View FIGURES 25–29 ); female flagellomeres comparatively short ( Fig. 18 View FIGURES 17–24 ), e.g. 1 st flagellomere 2.2× as long as wide; forewing speculum open below; scutellum convex ( Fig. 28 View FIGURES 25–29 ); first gastral tergite with punctures in posterior ½. Similar to H. butcheri   but differs in both sexes in having lateral margin of anterolateral foveae straight ( Fig. 38 View FIGURES 34–42 ), and with male vertex and thoracic dorsum golden-red ( Fig. 21 View FIGURES 17–24 ). Also similar to H. multistriatus   but differs in same character as mentioned for H. butcheri   , and in having anterolateral foveae of propodeum reticulate ( Fig. 38 View FIGURES 34–42 ).

Description. FEMALE. Length 2.7–2.8 mm. Scape yellowish-white with apical ¼ dark brown with metallic tinges; pedicel and flagellum metallic bluish-green. Frons and vertex metallic bluish-green. Mesoscutum and scutellum metallic bluish-green, propodeum with smooth parts golden-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 with anterior ¼ golden-green, posterior ¾ metallic dark purple; remaining tergites metallic dark purple.

Antenna as in Fig. 18 View FIGURES 17–24 . 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; notauli as narrow and distinct grooves. Scutellum with engraved and strong reticulation. Dorsellum smooth, anterolaterally with two large foveae. Coxae smooth and shiny. Propodeum smooth and shiny, posterolateral parts, submedian grooves and anterolateral foveae reticulate; propodeal callus with two setae. Forewing speculum open below; with 16–20 admarginal setae.

Gaster with first tergite smooth and shiny in anterior ½ and along posterior margin, posterior ½ with punctures.

Ratios. DE/DO 4.1; WH/DE 2.6; HE/MS/WM 4.6/1.0/2.7; POL/OOL/POO 4.8/1.2/1.0; WH/WT 1.1; LW/ LM/HW 1.9/1.1/1.0; PM/ST 1.2; LC/WC 8.3; WG/WC 2.8; LS/LT 0.17; LP/WP 1.1; MM/LG 1.0.

MALE. Length 2.1–2.2 mm. Vertex and thoracic dorsum golden-red. Colour otherwise as in female. Antenna as in Fig. 19 View FIGURES 17–24 . Head and mesosoma as in female.

Ratios. HE/MS/WM 4.2/1.0/2.4; LP/WP 1.4; MM/LG 1.6.

Distribution. Mexico.

Hosts. Acanthoscelides   sp. ( Coleoptera   : Chrysomelidae   : Bruchinae) on Phaseolus vulgaris   ( Fabaceae   ).

Type material. Holotype female labelled “ MEXICO, Morelos, Cuernavaca, 99°13'03.0''W 18°58'41.9''N, 1884 m, 21.xii.2007, S. Kenyon ”, “From Acanthoscelides   sp. on Phaseolus vulgaris   ”, in MZLU GoogleMaps   . Paratypes: 15♀ 17♂ mounted on cards (in MZLU). MEXICO. Mexico: Jalmalonga , 99°29'23.3''W, 18°54'54.1''N, 1527 m, 20.xii.2009, I. Zaugg, from Acanthoscelides   sp. on Phaseolus vulgaris   (1♀ 2♂) GoogleMaps   . Michoacan: Ario de Rosales   , 101°44'17.2''W 19°11'57.9''N, 1716 m, 29.xii.2009, I. Zaugg, from Acanthoscelides   sp. on Phaseolus vulgaris   (1♀) GoogleMaps   ; Morelos: with same label data as holotype (3♀ 1♂)   ; from same locality and same host as holotype but collected 6.i.2008 (4♀ 1♂)   , 25.1.2008 (4♀ 3♂)   , 23.ii.2008 (1♀); Cuernavaca , 99°13'02.1''W 18°58'41.4''N, 1862 m, 10.xii.2009, I. Zaugg, from Acanthoscelides   sp. on Phaseolus vulgaris   (1♂) GoogleMaps   ; Cuernavaca , 99°12'34.8''W 18°58'53.8''N, 1886 m, 22.xii.2009, I. Zaugg, from Acanthoscelides   sp. on Phaseolus vulgaris   (2♂) GoogleMaps   , and from same locality and same host but collected 14.i.2010 (2♀ 4♂) GoogleMaps   ; Tepoztlan , 99°07'08.1''W 18°59'50.7''N, 1908 m, 6.i.2008, S. Kenyon, from Acanthoscelides   sp. on Phaseolus vulgaris   (1♂) GoogleMaps   , and from same locality but collected 25.i.2008 (1♂) GoogleMaps   .

Etymology. This species is named after Robert F. Denno in recognition for his significant contributions to insect ecology.

Molecular data. Horismenus dennoi   equals “HB2” in Kenyon et al. (2015) and molecular data associated with “HB2” is accounted for in that paper.