Cernotina lobisomem sp. nov.

Figs. 5–8

Description. Male. Length of each forewing 2.8–3.0 mm. General color, in alcohol, pale brown; head with dark brown setae, antennae stramineous, thorax and abdomen with golden setae, wings ochraceous, legs pale brown with dark brown setae. Male genitalia. Sternum IX trapezoid, deeply excavated anteriorly (Fig. 7). Tergum X membranous, divided into 2 long lobes, finger-shaped, and covered by long setae (Fig. 6). Preanal appendages with dorsolateral lobes apparently absent (Figs. 5, 6); and with ventromesal lobes bipartite, each with dorsal branch rod-like, elongate, slender, basal area flat and broad, bearing pair of stout, dark, apical and mesal spines, surrounded by short dark setae; ventral branch short and obtuse, bearing 5 long spine-like setae (Figs. 5, 6). Inferior appendages shorter than tergum X or ventromesal lobes of the preanal appendages, each having mesal surface with lobe bearing spine-like setae, transversal striae on mesal region, and with apical area darkened and sclerotized; basodorsal lobe long, finger-shaped, slightly curved inward, with 6, long, spine-like setae distomesally; apicomesal lobe strongly sclerotized, curved laterad and bearing 2 spine-like setae mesally (Figs. 5, 7). Phallus (Fig. 8) tubular, internally with 2 short dark spines, and phallicata sclerite with 2 parallel branches in dorsal view.

Remarks. Cernotina lobisomem sp. nov. seems to be a member of the C. cygnea group Flint, 1971, which includes C. antonina Holzenthal & Almeida, 2003; C. cygnea Flint, 1971; C. decumbens Flint, 1971; and C. trispina Flint, 1971 . The new species has the dorsal branch of the ventromesal lobe of each preanal appendage similar to that of C. antonina, but C. lobisomem is easily distinguished from C. antonina by the long fingerlike lobes of tergum X; by the dorsal branch of the ventromesal lobe of each preanal appendage with mesal spines displaced more basally; and by the characteristic inferior appendage, each with a long basodorsal lobe bearing long spine-like setae and with a robust apicomesal lobe.

Holotype male: BRAZIL: Amazonas: Manaus, tributary to Igarapé do Lobisomem, basin of Rio Cuieiras, 2°33'46.4''S, 60°19'03.4''W, 22.viii.2004, J.L. Nessimian & L. Fidelis, light trap (INPA).

Paratypes: 4 males, same date and locality of holotype (INPA); 5 males, same date and locality of holotype (DZRJ).

Etymology. The new species epithet is a noun (with unchanging termination) in apposition to the genus name, alluding to the stream where the specimens were collected.