Tainarys nigricornis sp. n.

(Figs 7, 21, 35, 49, 63, 77, 80, 88, 101, 114, 127, 139, 151)

Material examined. Holotype ♂, Brazil: Mato Grosso do Sul, Dourados, Campus da Embrapa, S22°17.122’ W54°48.570’, 377 m, 13.ix.2013, (D. L. Queiroz) # DLQ 578 (MZSP, dry mounted).

Paratypes. Brazil: Mato Grosso do Sul: 21 ♂, 13 ♀, same data as holotype but (MZSP, NHMB, dry and slide mounted, in 70% ethanol); 15 ♂, 5 ♀, same data but S22°17.249’ W54°48.701’, 383 m, #DLQ 579 (NHMB, in 70% ethanol); 1 ♀, same data but S22°16.940’ W54°49.190’, 389 m, #DLQ 580; 17 ♂, 12 ♀, Sidrolândia, South of Sidrolândia, MS 162, S21°04.7’ W54°57.4’, 440 m, 17.xi.2012, Cerrado, Schinus longifolia (D. Burckhardt & D. L. Queiroz) #75(12) (BMNH, NHMB, dry and slide mounted, in 70% ethanol) ; 55 ♂, 31 ♀, Jardim, near BR 267, S21°27.0/28.0’ W55°47.5/48.2’, 380–440 m, 18–20.xi.2012, same but Cerrado edge along unpaved road, gallery forest along river, single trees in field, Schinus engleri and S. longifolia, #76(4) (NHMB, in 70% ethanol).

Description. Adult. Colouration. Dirty whitish to straw coloured with well contrasting dark brown to almost black pattern as follows. Head with a large round spot on each half of vertex. Eyes greyish; ocelli orange to reddish. Clypeus dark brown to almost black; tip of rostrum black. Antenna completely black. Pronotum with a larger submedian and a smaller sublateral dark dot on either half; ventral edge of propleurites with longitudinal, narrowly oval dark patch. Mesopraescutum with two oblique narrowly oval black patches near fore margin which meet in the middle; mesoscutum with four longitudinal black bands, the two outer ones broken in the middle; mesoscutellum whitish; mesopleuron with each a dorsal and ventral black dot; mesosternum dark brown or black. Metanotum light. Tarsi brown. Forewing veins and narrow stripes along the veins irregularly lighter or darker brown (Figs 7, 21). Male abdominal tergites and terminalia dark brown or black; female abdominal tergites laterally and proctiger brown. Dark colour in younger specimens lighter and less expanded.

Structure. Vertex (Figs 49, 63) 1.4 times as wide as long, surface coarsely pitted; genae narrowly rounded down; frons large, triangular. Antenna (Fig. 77, 80) with one subapical rhinarium on each of segments 4, 5, 6, 8 and 9; segments 4‒6 relatively thick and short, decreasing in thickness from 4‒6, segment 9 slightly thicker than segments 8 and 10; relative length of antennal flagellar segments = 1.0/ 0.6/ 0.5/ 0.5/ 0.6/ 0.8/ 0.6/ 0.6; segment 3 shorter than segments 4 and 5 together; segment 10 with longer terminal seta about 0.9 as long as segment and shorter seta about 0.5 times as long. Clypeus strongly flattened, triangular. Pronotum transverse, long, about 4 times as wide as long. Meso- and metascutellum transverse, weakly raised. Metacoxa (Fig. 88) with meracanthus forming small, flat tubercle and long, cylindrical, weakly curved membranous process on the trochanteral cavity. Metatibia with an open crown of 6–7 apical sclerotised spurs. Forewing (Figs 7, 21) irregularly lanceolate, apex narrowly rounded, weakly asymmetrical; vein C+Sc almost straight, widened; vein Rs curved forwards in a 45–90° angle in apical fifth; vein M1+2 curved towards fore margin of wing; membrane semi-transparent; surface spinules distinct, densely spaced along the veins, sparsely, irregularly distributed and often indistinct in the cells; radular spinules forming broad, ill-defined bands along wing margin in cell m1, m2, and cu1. Terminalia as in Figs 101, 114, 127, 139, 151. Male subgenital plate, in profile, indistinctly subtriangular with evenly curved dorsal margin. Paramere sickle-shaped, bent backwards from the middle, dorsal margin of apical portion straight; inner face bearing a row of 8–10 strongly sclerotised black pegs. Distal portion of aedeagus strongly inflated apically. Female proctiger relatively short with short blunt apical process. Subgenital plate with 3–5 transverse rows of densely spaced setae at base which strongly contrast with the other setae, truncate apically.

Measurements (in mm) and ratios (3 ♂, 3 ♀). Head width (HW) 0.86–1.00 (0.93±0.05), antenna length (AL) 0.74–0.86 (0.80±0.05), forewing length (WL) 2.04–2.50 (2.31±0.18), metatibia length (TL) 0.50–0.58 (0.340±0.04), male proctiger length (MP) 0.30–0.40 (0.35±0.05), paramere length 0.24–0.32 (0.27±0.04), length of distal segment of aedeagus 0.22–0.26 (0.27±0.04), female proctiger length (FP) 0.46–0.48 (0.47±0.01).—AL/HW 0.77–0.91 (0.86±0.05), WL/HW 2.34–2.60 (2.48±0.10), WL/forewing width 2.19–2.38 (2.29±0.07), metafemur length/TL 0.68–0.80 (0.73±0.04), TL/HW 0.54–0.60 (0.58±0.02), MP/HW 0.35–0.43 (0.39±0.04), FP/HW 0.46– 0.50 (0.48±0.02), FP/circumanal ring length 2.88–3.29 (3.05±0.21), FP/subgenital plate length 1.15–1.28 (1.21±0.06).

Fifth instar immature unknown.

Etymology. From Latin niger = black and cornus = horn, referring to the conspicuously black antennae.

Distribution. Brazil (Mato Grosso do Sul).

Host plants. Adults were collected on Schinus engleri F.A. Barkley and S. longifolia (Lindl.) Speg. (Anacardiaceae) which are likely hosts.