Oncerotrachelus amazonensis Gil-Santana, 2013, sp. nov.

Oncerotrachelus amazonensis sp. nov.

PLATE 1. Figs. 1–6, Oncerotrachelus amazonensis sp. nov., male holotype, 1, dorsal view, 2, lateral view, 3, rostrum, lateral view, 4, head and prothorax, lateral view, the arrow points to the spine of anterior lobe of pronotum, 5, prothorax and scutellum, lateral view, 6, posterior portion of prothorax, meso-, and metathorax, lateral view,

PLATE 2. Figs. 7–13, Oncerotrachelus amazonensis sp. nov., male holotype, 7, procoxa, ventral view, the arrow points to waxlike excretion attached, 8, last two abdominal segments with male genitalia in situ, ventral view, 9–13, male genitalia, 9–11, eighth sternite, pygophore, and parameres, 9, ventral view, 10, dorsal view, 11, lateral view, 12, paramere, 13, phallus, dorsal view.

Description. Male (Figs. 1–13). Dimensions (in mm): HOLOTYPE: Total length: to tip of abdomen: 7.2; to tip of forewings: 7.4; head length: 1.1; maximum width across the eyes: 0.8; ante-ocular length: 0.4; post-ocular length: 0.4; inter-ocular space: 0.25; antennal segments: I: 2.2; II: 1.5; III: 1.4; IV: broken at basis; rostral segments: I: 1.0; II: 0.3; III: 0.35. Thorax: pronotum: fore lobe length: 0.55; hind lobe: length: 0.6; width at posterior margin: 1.2. Legs: prolegs: coxa: 0.9; femur: 2.4; tibia: 2.0; tarsus: 0.65; middle legs: femur: 2.4; tibia: 2.6; tarsus: 0.6; hind legs: femur: 3.6; tibia: 4.5; tarsus: 0.65. Abdomen: length: 4.0. General color yellowish brown to testaceous; integument shiny with numerous long and short golden and yellowish hairs (Figs. 1–6). HEAD (Figs. 3–4): somewhat darkened on dorsal portion of inter-ocular and post-ocular areas, with numerous long, erect and curved hairs, less numerous on interocular space; a rounded tubercle with several stiff setae anteroventrally between antennal insertion and apex of head; stiff bristles implanted laterally on post-ocular area as well; transverse sulcus deep, reaching eyes at hind margin; post-ocular region subglobose; interocular distance about 1.25 times the width of an eye; eyes globose in dorsal view, in lateral view occupying dorso-ventral height of head. Antennal segments slender; segment I clothed with long fine ciliated hairs beside short fine hairs; length of longer elements of first antennal segment approximately 2.5 times width of the segment; segment II with long ciliated hairs on basal half, in which longer elements are approximately 1.5 times width of segment. Rostrum (Fig. 3): stiff hairs on upper surface of segments and numerous long, erect, and curved hairs, more numerous on ventral and lateral faces of first two segments; segment I elongated, and thinner basally and somewhat swollen near middle third, reaching distal portion of post-ocular ventral area; segment II moderately swollen; segment III slender, tapering. THORAX (Figs. 1–2, 4–7): anterolateral angles of pronotum rounded in dorsal view; prothorax divided by furrow between anterior and posterior lobes of pronotum, this shallower on median portion; median longitudinal sulcus relatively broad, much deeper on anterior lobe, not reaching hind margin of posterior lobe; anterior lobe with a pair of short and darkened spines on center of disc of anterior lobe (Fig. 4), lateral to spines, a pair of oblique glabrous shallow sulci; integument of posterior lobe of pronotum finely rugose; humeral angles rounded with a prominent spine with acute apex (Figs. 4–6); a lateral shallow and straight ridge is more developed on its posterior 2/3 portion; fore acetabula prominent, divided on its anterior third by a sulcus (Fig. 5); scutellum long, triangular, with thick and elevated margins forming lateral carina, and numerous long hairs, except on disc, where shorter; median carina obsolete; apical spine long, moderately elevated from basis, apex rounded (Figs. 1, 5). A strong spiniform process, with a blunt apex, implanted posteriorly to anterolateral angle of metathorax (Fig. 6). Prosternum larger on anterior margin, stridulitrum long, narrow; mesosternum larger than metasternum, both with a median carina. Forewings extending beyond tip of abdomen; darkened, with basal portion and C + R vein (nomenclature follows Villiers 1943a) at basal half, yellowish; R + M yellowish brown; C+R and R + M veins and pterostigma covered with moderately long fine hairs. Legs somewhat darkened on distal portion of femora, whose apices are brighter; with golden and yellowish long hairs, these longer and more numerous on ventral portion of profemora (Fig. 5); protibiae swollen apically; procoxa approximately four times longer in length than in width, with a bump on its inner side with bright wax-like excretion attached (Fig. 7); hind femora somewhat curved in basal half. ABDOMEN (Fig. 8): somewhat darkened on lateral portion of sternites; posterior angles of connexival segments I–V with short and acute spines, these decrease in size distally; sternites I–V provided with a prominent median longitudinal keel (Fig. 8). MALE GENITALIA (Figs. 8–13): Medial process of pygophore conspicuous, triangular (Figs. 8–10). Pygophore subrectangular in ventral view (Figs. 8–9). Parameres symmetrical, strongly curved at apical half (Figs. 9–12). Parameres’ apices seem somewhat curved outwardly when in situ, with long and short hairs on exposed portion (Figs. 9–12). Phallus elongated, somewhat tubular, with articulatory apparatus elongated and apex sub-squared (Fig. 13).

Material examined: male holotype, BRAZIL, Amazonas, Novo Aripuanã (05° 15’ 53” S – 60° 07’ 08” W), Reserva Soka, 28.IV–06.V.1999, Susp. Igarapé-Mata, Ferreira, R.L., Rocha, R.A., Vidal, J. & Leite, R.S. [leg.], [INPA].

Etymology. The name of the new species was given in reference to the state of Amazonas, Brazil, where the holotype was collected.