Dentalion apertum sp. nov.

(Figs 10–13, 50, 52, 58)

Diagnosis. Forewing speculum open (Fig. 52); forewing costal cell bare (Fig. 52); frontal suture reaching eyes at level equal with middle of anterior ocellus (Fig. 13); propodeum smooth (Fig. 12), callus with 5 setae.

Description. FEMALE. Length 2.3 mm. Scape yellowish-brown with dorsal and ventral edges dark brown, pedicel and flagellum dark brown. Frons below frontal suture black with metallic blue and purple tinges, above frontal suture metallic bluish-purple. Vertex inside ocellar triangle metallic dark purple, outside ocellar triangle golden-green. Mesoscutum metallic dark purple. Scutellum with a triangular area in anterior 2/3 golden-green, otherwise metallic bluish-green. Propodeum metallic bluish-green. Coxae, femora and tibiae dark and metallic; tarsi with tarsomeres 1–3 white, 4 dark brown. Forewing hyaline. Gaster with tergites 1 and 2 metallic bluish-green, remaining tergites dark brown with golden-green tinges.

Antenna as in Fig. 58. Frons smooth below frontal suture close to scrobes and close to eyes (Fig. 10), but with raised, strong reticulation between the smooth areas and above frontal suture; frontal suture reaching eyes at level equal with middle of anterior ocellus. Vertex with raised, strong reticulation inside ocellar triangle, but smooth outside ocellar triangle (Fig. 13). Occipital margin rounded. Eyes with sparse, scattered hairs.

Pronotum without transverse carina close to posterior margin (Fig. 11). Mesoscutum with raised, strong reticulation (Fig. 11); notauli as narrow distinct grooves in anterior 1/3, not visible in posterior 2/3. Scutellum with raised, rather strong reticulation (Fig. 11) except posterior margin smooth; with 1 pair of setae. Propodeum smooth (Fig. 12); callus with 5 setae. Forewing speculum open below; costal cell bare.

Petiole 0.2X as long as wide, smooth. Gaster elongate with apex acuminate; tergites smooth.

MALE. Unknown.

Material examined. Holotype female (BMNH) labelled “ COSTA RICA, Puntarenas, San Vito, Las Cruces, 08˚47'N 82˚58'W, 1000–1300 m, 7–19.ii.2007, C. Hansson”.

Etymology. Named for the open speculum in the forewing, from the Latin apertus = open.

Distribution. Costa Rica.