Cornugon gibberum sp. nov.

(Figs 1, 28–32, 54, 82)

Diagnosis. Vertex with two weak humps, one behind each posterior ocellus, and medially with a groove between occipital margin and anterior ocellus (Fig. 29); scutellum without median groove (Fig. 30); propodeum without median carina (Fig. 31); petiole 1.0–1.5X as long as wide, transversely striate and shiny (Fig. 31); first gastral tergite covering about 1/3 of gaster.

Similar to C. reticulatum, but differing in having upper part of frons and vertex smooth.

Description. FEMALE. Length 1.0–1.1 mm. Antenna dark brown except scape white. Frons metallic dark purple, golden-green along eyes. Vertex, mesoscutum, scutellum and propodeum golden-green. Coxae dark and metallic; femora, tibiae and tarsi white. Wings hyaline. Petiole golden-green. Gaster weak golden-green.

Antenna as in Fig. 82. Frons and vertex smooth and shiny (Figs 28, 29), frons almost flat; tentorial pits distinct (Fig. 28); vertex with two humps, one behind each posterior ocellus.

Mesonotum with a more or less round fovea medially between mesoscutum and scutellum (Fig. 30). Mesoscutum with weak reticulation, the meshes transverse, anteriorly on midlobe, and posterior of midlobe and sidelobes smooth and shiny (Fig. 30). Scutellum with anterior ½ smooth and shiny except for weak elongate striae, and posterior ½ with strong reticulation (Fig. 30). Dorsellum very short, almost hidden under scutellum with only very posterior parts visible in dorsal view (Fig. 30). Propodeum smooth and shiny between plicae (Fig. 31).

Petiole 1.0–1.5X as long as wide, with transverse carinae and shiny (Fig. 31). Gaster ovate with first tergite covering about 1/3 length.

MALE. Unknown.

Type material. Holotype female (BMNH) labelled " Costa Rica, Guanacaste, Santa Rosa National Park, Hacienda 1O, 2–23.iii.1986, D.H. Janzen & I.D. Gauld". Paratypes. 8Ƥ on cards. COSTA RICA. Alajuela: Parque Nacional Arenal, 600 m, 10˚28'N 84˚45'W, 21–28.ii.2005, C. Hansson” (1Ƥ, CH); Guanacaste: with same label data as holotype (2Ƥ, CNC, INBio); from same locality as holotype but collected 8.ii–2.iii.1986 (1Ƥ, USNM), and 23.iii–12.iv.1986 (1Ƥ, BMNH), and 4–25.iv.1987 (1Ƥ, CH); Bosque Nacional Diriá, Retallano, alrededor Torre Control de Incendio, 600–700 m, 14.viii–18.ix.2001, LN 238550/358650, I. Jiménez (1Ƥ, INBio); Heredia: Santo Domingo, INBio-Parque, 11–25.ii.2006, J.S. Noyes” (1Ƥ, BMNH).

Etymology. Named after the humps on the vertex, from the Latin gibbus = humped.

Distribution. Costa Rica.