Dentalion ambonatum sp. nov.

(Figs 6–9, 57)

Diagnosis. Scutellum with 2 pairs of setae, one anterior and one posterior (Fig. 7); pronotum with a weak transverse carina close to posterior margin (Fig. 7); frontal suture reaching eyes at a level equal with anterior margin of anterior ocellus (Fig. 9); forewing costal cell ventrally with a sparse row of setae in apical ½ (as in Fig. 51).

Similar to D. quadrifer and D. apon except for height of frontal suture, weak pronotal carina close to posterior margin, distinct notauli in posterior 2/3 (Fig. 7), and propodeal callus with 7 setae.

Description. FEMALE. Length 2.1 mm. Scape pale brown with dorsal edge dark brown, pedicel and flagellum dark brown. Frons metallic bluish-purple with clypeal area golden-green. Vertex metallic bluish-purple. Mesoscutum, scutellum and propodeum metallic bluish-green with purple tinges, scutellum with posterior 1/5 metallic purple. Coxae dark and metallic; femora and tibiae dark brown; tarsi with tarsomeres 1–3 white, 4 dark brown. Forewing hyaline. Gaster with tergites 1, 2, 6 metallic bluish-green, remaining tergites dark brown with metallic tinges.

Antenna as in Fig. 57. Frons with raised, weak reticulation (Fig. 6); frontal suture reaching eyes at level equal with anterior margin of anterior ocellus. Vertex with engraved, weak reticulation (Fig. 9). Occipital margin rounded. Eyes with longer hairs and eye setation denser than in other species (Figs 6, 9).

Pronotum with a weak transverse carina close to posterior margin (Fig. 7). Mesoscutum with raised, strong reticulation (Fig. 7); notauli as narrow distinct grooves in anterior 1/3, and as wide but distinct grooves in posterior 2/3. Scutellum with raised, weak reticulation (Fig. 7), posterior margin smooth; with 2 pairs of setae. Propodeum with weak reticulation and irregular longitudinal carinae medially (Fig. 8); callus with 7 setae. Forewing speculum closed below; costal cell ventrally with a sparse row of setae in apical ½.

Petiole 0.4X as long as wide, smooth. Gaster elongate with apex acuminate; tergites smooth.

MALE. Unknown.

Material examined. Holotype female (BMNH) labelled “ BRAZIL, Bahia Mucari, xi.1978, F. Benton”.

Etymology. Named for the (weak) pronotal carina, from the Greek ambon = carina, ridge.

Distribution. Brazil.