Cornugon unicornis Hansson, 2011, sp. nov.

Cornugon unicornis sp. nov.

(Figs 48–51, 57, 85)

Diagnosis. Frons with upper-median part with a single pointed “horn” (Fig. 48); vertex with a complete median groove and with a groove delimiting posterior part of ocellar triangle (Fig. 51); scutellum with a deep and distinct median groove in anterior 2/3 (Fig. 49); propodeum with a median carina in anterior ½ (Fig. 50); hind coxa conspicuously hairy on posterior surface; petiole 1.4X as long as wide and reticulate with small meshes, hence dull (Fig. 50); first gastral tergite shiny and large, covering 2/3 length of gaster.

Similar to C. leios and C. petiolatum, but differing from both in having a single horn medially on the upper part of frons.

Description. FEMALE. Length 1.4–1.6 mm. Scape white, remaining antenna dark brown. Frons metallic dark purple. Vertex metallic greenish-blue. Mesoscutum metallic greenish-blue. Scutellum with smooth anterior part metallic greenish-blue, reticulate posterior part metallic dark purple. Propodeum metallic greenish-blue. Coxae dark and metallic; femora, tibiae and tarsi white. Wings hyaline. Petiole metallic dark purple. Gaster with first tergite metallic greenish-blue in anterior ¾, and posterior ¼ and remaining tergites metallic dark purple.

Antenna as in Fig. 85. Frons smooth and shiny (Fig. 48); upper-median part with a pointed “horn”; lower part of frons close to mouth opening drawn out, and with mandibles pointing downwards; frontal suture incomplete, terminating at a distance equal to diameter of torulus from each eye margin; antennal scrobes uniting on frontal suture; tentorial pits missing (Fig. 48). Vertex smooth and shiny (Fig. 51), with a complete median groove between occipital margin and anterior ocellus.

Mesonotum with a more or less quadratic fovea medially between mesoscutum and scutellum (Fig. 49). Mesoscutum smooth and shiny except for strong pit-like reticulation on very anterior part close to pronotum (Fig. 49). Scutellum with anterior 2/3 smooth and shiny with distinct median groove, posterior 1/3 with raised, strong reticulation (Fig. 49); anteromedian part protruding into posteromedian mesoscutum and with a quadrangular pit in front of protrusion. Dorsellum hidden under scutellum, not visible in dorsal view (Fig. 49). Propodeum smooth and shiny, with a median carina in anterior ½ and with complete plicae (Fig. 50).

Petiole about 1.4X as long as wide and reticulate with small meshes, hence dull (Fig. 50). Gaster ovate with first gastral tergite shiny and large, covering 2/3 length.

MALE. Unknown.

Type material. Holotype female (INBio) labelled " Costa Rica, Heredia, Santo Domingo, INBio-Parque, iii.2002, J.S. Noyes & J.A. Azofeifa". Paratypes. 2Ƥ on cards. COSTA RICA. Heredia: with same label data as holotype (BMNH, MIUCR).

Etymology. Named referring to the single hornlike protrusion on median frons, from the Latin unus = one, and cornu = horn.

Distribution. Costa Rica.