Ochrotrichia belodes sp. nov.

(Figures 2A–2C, 3A–3B, 4A–4H)

Material examined. Holotype male (INPA). BRAZIL: Amazonas: Manaus, Reserva Ducke, Igarapé do Ipiranga, 02°58’53.6”S, 59°54’24.4”W, el. 95 m a.s.l., 07–19.iv.2017, A.M.O. Pes, G. R. Desidério, P. Barcelos-Silva legs., Malaise trap.

Paratypes: BRAZIL: Amazonas: Manaus, Reserva Ducke, Igarapé Barro Branco, 02°55’48.9”S, 59°58’26.14”W, el. 69 m, 1 male (INPA), 15–25.x.2018, E.B. Pereira, G. R. Desidério legs., Malaise trap .

Diagnosis. The new species is most similar to O. igrapiuna based on the pointed apex of the tergum X. Ochrotrichia belodes sp. nov. also resembles O. buenosoria sp. nov. by the presence of basal spines on the inferior appendages and the basal processes on tergum X; and O. ducke sp. nov. by the cluster of mesal spines on the inferior appendage. However, in O. igrapiuna the tergum X has a sclerotized, spine-like basal process, which is absent in O. belodes sp. nov. The basal spines of the inferior appendages are short in this new species, whereas they are long in O. buenosoria sp. nov. and absent in O. ducke sp. nov. In addition, in O. belodes sp. nov. the basal process of tergum X is dorsal but dorsolateral in O. buenosoria sp. nov.

The new species can be distinguished from all other similar species by the combination of the sagittate tergum X in dorsal view with a pair of basal processes directed anterad and the three clusters of spines on the inner surfaces of the inferior appendages, one subapical with thinner peg-like setae, one at mid-length with thicker spines, and one on the basal region with thicker spines.

Description. Male adult (n = 2). Total body length 1.83–2.25 mm; length of each forewing 1.60–1.98 mm. General color brown (in alcohol) (Fig. 2A). Head with three ocelli; dorsally with two pairs of setal warts; ocellar pair appressed on midline, each subtriangular; posterolateral pair large, ellipsoid (Fig. 2B). Metascutellum subpentagonal (Fig. 2C). Forewings each with forks I, II, III present; discoidal cell absent; R 3 fused with basal 3/4 of R 4+5; M 1+2 partially fused with subapical portion of R 4+5; M 1 vein distinct from mid-length of R 5 vein; M 2 vein distinct from R 4+5 vein immediately before origin of fork II; fork of M 1+2 and M 3+4 veins near origin of independent R 3 vein; r and r-m crossveins absent (Fig. 3A). Hind wings each with forks II and V present; C with row of short spines on proximal region; R 2+3 vein originating near level of apex of M 1+2; base of M 1+2 vein fused with R and R 2-5, becoming independent from basal 1/3 of R 2-5; and Cu 1 vein subdivided apically into 2 branches (Fig. 3B). Tibial spur formula 0, 3, 4. Abdominal sternum VII with subtriangular mesoventral process (Fig. 4B).

Genitalia. Segment IX in lateral view with upper anterolateral margin concave, ventromesally produced; upper posterolateral margins slightly produced posterad (Figs 4A 1, 4C); in dorsal view, with deep U-shaped cleft posteriorly (Fig. 4E); in ventral view, subpentagonal (Figs 4G, 4H). Tergum X in lateral view long, 2/3 as long as inferior appendages, convex ventrally at midlength and tapering to subacute apex (Figs 4A 1, 4A 2); in dorsal view, not divided, sagittate, narrow, with long, semi-membranous base bearing two sclerotized, claw-like basodorsal process directed posterad; pair of triangular lobes at midlength directed anterad; and apex strongly sclerotized, pointed (Fig. 4E). Inferior appendages in lateral view oblong; 3.5× as long as wide, apically rounded (Figs 4A 1, 4C); in dorsal view, surpassing tergum X, with inner surfaces bearing numerous slender, dark, peg-like setae grouped subapically (Fig. 4E); in ventral view, with two additional clusters of thick spines on inner margin: (i) row of 4 or 5 thick spines at midlength; (ii) row of 3 or 4 thick spines basally (Figs 4G, 4H). Phallus simple, tubular, elongate, 3.2× longer than inferior appendages and thread-like (Figs 4D, 4F).

Female and immature stages. Unknown.

Distribution. BRAZIL (Amazon: Amazonas state) (Fig. 1).

Etymology. The specific epithet is an allusion to the sagittate or arrowhead shape of tergum X in dorsal view. Derived from the Greek adjective, belodes meaning “like an arrow”.