Horismenus butcheri, Hansson, Christer, Aebi, Alexandre & Benrey, Betty, 2004

Hansson, Christer, Aebi, Alexandre & Benrey, Betty, 2004, Horismenus species (Hymenoptera: Eulophidae) in a bruchid beetle parasitoid guild, including the description of a new species, Zootaxa 548, pp. 1-16 : 10-11

Horismenus butcheri sp.nov. Hansson & Aebi

Figs 2–7 , 20–21

Diagnosis. Female gaster elongate (MM/LG = 0.8–0.9) ( Fig. 6 ); female funicular segments long ( Fig. 20 ), e.g. first funicular segment 3.5X as long as wide; male scape narrow, 4.5X as long as wide ( Fig. 21 ).

Description. Length of body female 2.6–2.8 mm, male 2.2–2.6 mm.

Scape yellowish­white with apical 1/4 metallic bluish­green; pedicel and flagellum metallic bluish­green. Frons golden­green in female, metallic purple in male. Vertex metallic bluish­green in female, golden­green with purple tinges in male. Mesosoma metallic bluish­green with purple tinges to golden­green, propodeum metallic bluish­green to golden­green with sunken and reticulate parts dull golden­purple. Coxae metallic bluish­green; femora, tibiae and tarsi yellowish­white. Wings hyaline. Petiole dull goldenpurple. First gastral tergite metallic bluish­green in anterior 1/3, dull golden­purple in posterior 2/3.

Antennae as in Figs 20–21 . Frons with strong small­meshed reticulation, reticulation weaker above frontal suture, interscrobal area and clypeal region smooth and shiny; frontal suture V­shaped, terminating before reaching eyes; antennal scrobes join below frontal suture. Vertex with strong, engraved and small­meshed reticulation; with a median groove in posterior half, groove continues down on occiput. Occipital margin rounded. Ratios of HE/MS/WM female 3.6/1.0/2.3, male 4.3/1.0/2.8; POL/OOL/POO 6.0/1.3/1.0; WH/WT 1.1.

Mesoscutum with strong large­meshed reticulation; notauli indistinct and wide in posterior 1/3. Scutellum with strong and engraved reticulation. Dorsellum smooth, with two large foveas anterolaterally, foveas reticulate. Coxae with weak reticulation. Fore wing speculum open below. Propodeum smooth and shiny, with sunken parts reticulate; propodeal callus with two setae. Petiole 1.1X as long as wide in female, 1.4X as long as wide in male. Ratios of LW/LM/HW 1.8/1.1/1.0; PM/ST 0.9.

First tergite smooth and shiny in anterior 1/3, posterior 2/3 with micropunctures. Ratios of MM/LG female 0.8–0.9, male 1.0–1.1.

Distribution. Mexico, USA (New Mexico).

Hosts. Acanthoscelides sp. on Phaseolus vulgaris L. and Bruchus amicus Horn , both hosts are Bruchidae (Coleoptera) .

Material examined. Holotype female labeled “ Mexico: Est. Mexico, Temascaltepec, 100º02´W, 19º02´N, 1750m, 21.xii.2001 – 2.iii.2002, A. Aebi, ex Acanthoscelides sp. on Phaseolus vulgaris ” (BMNH). Paratypes: 3 females, 4 males with same label data as holotype (BMNH, USNM); 13 females 12 males from same locality as holotype but collected 5.i–20.ii.2003 ( CH, CNIN, MHNN); 2 females, 1 male from same locality as holotype but collected 27.i–21.ii.2001 and from 1700m altitude (CNC); 3 females, 4 males from same locality as holotype but collected 16.xii.2001 – 3.ii.2002 and from 1700m altitude (BMNH, CNC); 5 females, 5 males “ Mexico: Est. Mexico, Valle de Bravo, 100º09´W, 18º56´N, 1950m, 1.i–15.ii.2002, A. Aebi, ex Acanthoscelides sp. on Phaseolus vulgaris ” ( CH, CNC, USNM). Non­type material: a female included in the type material of Horismenus productus (Ashmead) (see below) from Bruchus amicus in New Mexico (USNM) is conspecific with butcheri . This specimen is not included in the type material because it is damaged.

Etymology. This species is named in honour of Dr. Robert D.J. Butcher, for guidance and support throughout the dissertation research of Alexandre Aebi.

Figures

FIGURES 2 – 5. Horismenus butcheri. 2. Head frontal, female. 3. Head frontal, male. 4. Thoracic dorsum, female. 5. Thoracic dorsum, male.

FIGURES 6 – 9. Horismenus spp., gaster dorsal. 6. H. butcheri, female. 7. H. butcheri, male. 8. H. depressus, female. 9. H. depressus, male.

FIGURES 20 – 29. Horismenus spp. 20 – 26. Antenna lateral. 20. H. butcheri, female. 21. H. butcheri, male. 22. H. depressus, female. 23. H. depressus, male. 24. H. missouriensis, female. 25. H. missouriensis, male. 26. H. productus, female. 27. H. productus, scape lateral, male. 28. H. produc­