Cornugon bicornis sp. nov.

(Figs 13–17, 52, 76–77)

Diagnosis. Upper part of frons with two "horns" and with frontal suture continuing up into apex of horns (Figs 13– 15); scape, femora and tibiae dark brown with metallic tinges; mesoscutum smooth and shiny (Fig. 16); scutellum with a deep and distinct median groove extending from anterior margin along 3/4 length (Fig. 16); propodeum without median carina (Fig. 17); hind coxa conspicuously hairy on posterior surface; petiole about 1.5X as long as wide, reticulate with small meshes and hence dull (Fig. 17); first gastral tergite shiny and large, covering 4/5 of gaster.

Similar to C. diabolos, but differing in having scape, femora and tibiae dark brown and with a narrow fovea medially between the mesoscutum and scutellum (Fig. 16).

Description. FEMALE. Length 1.0 mm. Antenna dark. Frons dark purple. Vertex golden-green. Mesoscutum golden-green with blue tinges anteriorly. Scutellum golden-purple, metallic greenish-blue laterally. Propodeum golden-green. Coxae, femora and tibiae dark and metallic with knees pale; tarsi pale brown. Wings hyaline. Gaster and petiole dark metallic purple.

Antenna as in Fig. 76. Frons and vertex smooth and shiny (Figs 13–15), frons concave; upper part of frons with two "horns"; tentorial pits distinct (Fig. 13); frontal suture incomplete, ending just below frontal horns; frontal speculum small.

Mesonotum with a narrow slit medially between mesoscutum and scutellum (Fig. 16). Mesoscutum smooth and shiny (Fig. 16). Scutellum with anterior 4/5 smooth and shiny, posterior 1/5 with strong reticulation (Fig. 16); with a distinct median groove extending from anterior margin along 3/4 length. Dorsellum hidden under scutellum, not visible in dorsal view (Fig. 16). Propodeum with irregular sculpture medially, otherwise smooth and shiny between plicae (Fig. 17).

Petiole about 1.5X as long as wide, reticulate with small meshes and hence dull (Fig. 17). Gaster ovate with first tergite shiny and large, covering 4/5 length.

MALE. Length 1.2 mm. Colour as in female except frons black with metallic shine, vertex golden-red, and mesoscutum golden-red. Antenna as in Fig. 77. Structure as for female except petiole 1.8X as long as wide and first gastral tergite covering 2/3 length of gaster.

Type material. Holotype female (BMNH) labelled " Costa Rica, Guanacaste, Guanacaste National Park, near headquarter, 5.iii.1990, J.S. Noyes". Paratypes. 1Ƥ 13 on cards. COSTA RICA. Guanacaste: Bagaces, Parque Nacional Palo Verde, Estación Pale Verde, 10 m, 10.x–10.xi.2000, LN 259050/388400, I. Jiménez, #60220 (1Ƥ, INBio); Bagaces, Parque Nacional Palo Verde, Sector Palo Verde, Cerro Guyacán, 212 m, 8.xii.1999 – 10.i.2000, LN 259350/389600, I. Jiménez, #54958 (13, BMNH).

Etymology. Named after the two hornlike protrusions on upper part of frons, from the Latin bi = two, and cornu = horn.

Distribution. Costa Rica.