Horismenus missouriensis (Ashmead)

Figs 1, 14–19, 24–25

Holcopelte missouriensis Ashmead, 1888:101 . Lectotype female in USNM, designated by Burks (1971), examined.

Holcopelte popenoei Ashhmead, 1888:101 . Synonymized by Girault (1934). Horismenus missouriensis (Ashmead), Schmiedeknecht (1909).

Diagnosis. Female gaster short (MM/LG = 1.1) and ovate (Fig. 18); female funicular segments short and stout (Fig. 24), e.g. first funicular segment 1.7X as long as wide; male scape swollen (Fig. 25), 2.8X as long as wide.

Description (of Mexican specimens). Length of body female 2.2–2.5 mm, male 2.0– 2.2 mm.

Female scape yellowish­white with apical tip dark brown, male scape with basal half yellowish­white and apical half metallic bluish­purple; pedicel and flagellum metallic bluish­green in female, metallic bluish­purple in male. Frons metallic bluish­green in female, metallic purple in male. Vertex metallic bluish­green in female, golden­green in male. Mesosoma metallic bluish­green with purple tinges, propodeum metallic bluish­green 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 24–25. Frons with strong small­meshed reticulation, reticulation weaker above frontal suture, interscrobal area smooth and shiny, clypeal region with weak transverse meshes; frontal suture V­shaped and complete; antennal scrobes join below frontal suture. Vertex with weak, 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 4.2/1.0/2.5, male 2.9/1.0/2.4; POL/OOL/POO 3.2/1.0/1.0; WH/WT 1.0.

Mesoscutum with strong large­meshed reticulation; notauli distinct and more or less wide in posterior 1/3. Scutellum with strong and engraved reticulation. Dorsellum smooth, with two large foveas anterolaterally, foveas reticulate. Coxae predominantly smooth and shiny with very weak reticulation at base. 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, 2.1X as long as wide in male. Ratios of LW/LM/HW 1.8/ 1.1/1.0; PM/ST 1.0.

First tergite smooth and shiny in anterior 1/3, posterior 2/3 microreticulate with isodiametric meshes and with micropunctures, or predominantly with micropunctures. Ratios of MM/LG female 1.1, male 1.4.

Distribution. Brazil (De Santis 1980, Sari et al. 2002), Mexico (new record), U.S.A. (Ashmead 1888) (from New York and southward (Burks 1979)).

Hosts. Acanthoscelides sp. on Phaseolus spp. (new record), A. floridae Horn (Brett 1946), A. submuticus (Sharp) (Peck 1963), Amblycerus robiniae (Fabricius) (Peck 1951), Ctenocolum crotonae (Fåhraeus) (Sari et al. 2002), Gibbobruchus sp. (Burks 1971). All hosts are Bruchidae (Coleoptera) .

Material examined. 25 females, 21 males from Mexico (Distrito Federal, Mexico, Michoacan, Morelos) from Acanthoscelides sp./ Zabrotes sp. on Phaseolus vulgaris and P. coccineus (CH).