Cortona silvai Duan, Dietrich & Zhang, 2017, sp. n.

Cortona silvai sp. n.

(Figs 5–6, 11 G)

Length. Male: 2.6–2.8 mm (n=3); female: 3.7–3.8 mm (n=3).

Morphology. Crown nearly as long as distance between eyes (Fig. 5 A). Male anteclypeus nearly parallel-sided (Fig. 5 C).

Male genitalia. Subgenital plate long, lateral margin slightly concave (Fig. 6 C). Style with articulating arm long; preapical lobe rectangle; apophysis very short, laterally curved (Fig. 6 D). Connective as long as aedeagus. Aedeagus not bifid apically, a pair of long subbasal appendages directed apicad on the dorsal surface (Fig. 6 E–F).

Female abdomen. Sternite VII with median lobe very narrow and digitiform, darkly pigmented in distal twothirds (Fig. 11 G).

Material examined. Holotype: male, Argentina: Corrientes P. N. Mburucuyà 1.4 km W campgd, 80 m, 28° 1′795" S, 58° 5′20" W, 8 January 2008, L. Silva, vacuum, AR9–2 [MLP]. Paratypes: 2 males, same data as holotype; 3 females, Argentina: Corrientes, P.N. Mburucuyá, 1.8 km W campgd., 80 m, 28° 1'11" S, 58° 3'18" W, 8 January 2008 C. H. Dietrich, vacuum, AR9–4 [INHS].

Etymology. This species is named for L. Silva who collected the holotype.

Remarks. This species is readily distinguishable from all others within Cortona by the aedeagus with the apex tubular rather than cleft and with a pair of robust appendages arising near the midlength of the shaft and directed posterolaterad (Fig. 6 E–F)