Oidardis falcimystax Cezar, Fisher & Lamas 2013

Holotype. Male. Body shiny black. Total length, excluding antennae, 5 mm; length of thorax, 1.2 mm; length of wing, 4.4 mm; greatest width of abdomen, 1 mm. Head, laterally. Face, between antennal insertion and gibbosity, plane with eye margin; gibbosity prominent, equals ventral 0.7 of face height; dorsal occipital setae dark-brown, lateral occipital setae white, ventral occipital setae white; proboscis 0.53 × the height of head, with a pair of yellow macrosetae ventrally; palpus dark-brown, with yellow setae apically. Antenna. Antenna 0.74 × as long as the height of eye, entirely dark-brown, with dark-brown setae and macrosetae; antennal insertion at dorsal 0.2 of head height; scape slightly longer than pedicel, with medium-sized ventral seta, numerous short setae ventrally and around the whole segment apically; pedicel oval; postpedicel oblong, 1.7 × length of basal two segments, brown-pollinose, except for silvery-yellow pollinosity on elliptical sensorial area on inner face, with dorsal spine subapical (3/4 length of postpedicel or beyond). Head, anteriorly. Head 1.39 × as wide as high; face 0.14 × as wide as head, silvery-pollinose, except on shiny upper half of gibbosity; mystax long (extending beyond the apex of proboscis), comprised of 6 macrosetae – dorsal pair regular and dark-brown, middle pair spatulate and dark-brown, and ventral pair sinuous-filiform and white; facial setae, other than mystax, pale-yellow; frons golden-pollinose; orbital setae dark-brown; vertex golden-pollinose; ocellar tubercle golden-pollinose, as high as vertex, 0.29 × as wide as frons, anterior ocellus 0.11 × as wide as frons by the ocellus position. Thorax. Postpronotal lobe dark-brown; scutum shiny black, not punctate, vestiture golden, equal-sized, longest setae as long as half the scape, reclinate anteriorly and proclinate posteriorly; one dark-brown notopleural; scutellum black, scutellar margin strongly impressed, marginal scutellar macrosetae dark-brown, equal-sized, longest ones much shorter than scutellum (as long as the width of the rim); postalar callosity dark-brown, partly with bright-blue reflections; pleuron shiny dark-brown, with silvery-white pollinosity; setulae on proepisternum, katepisternum and anepisternum yellow; one anepisternal macroseta, plus fine setulae, yellow; tuft of katatergal macrosetae light-brown; anatergite with golden, hair-like setae. Legs. Coxae orange-yellow; trochanter orange-yellow, with fine yellow setulae; femora yellow, slightly darkened dorsally—except hind femur, only darkened distally, covered with short stout yellow setulae dorsally, with dark setae on apical 1/3 dorsally, hind femur with 4 long yellow ventral macrosetae in a row along proximal half; tibiae entirely yellow, with yellow setulae, long yellow macrosetae and thick spines; hind tibia entirely covered by golden setulae, with white setulae ventrally, long dark-brown macrosetae ventrally and long dark-brown macrosetae anterodorsally; modified tibial setae attached to hind tibia at middle, dark-brown, shorter than femur, with dark-brown leaf-shaped longitudinally-striated lamella on apical 1/5; tarsi yellow, 5th tarsomere dark-brown, with stout yellow setae dorsally, and densely covered with thick spine-like golden setae, 5th tarsomere with 3 setae apically, opposite the claws and longer than them; claws yellow on base and black apically; pulvilli yellow and fringed; empodium shorter than claws. Wing. Brownish, darker along upper margin; cell r1 with short slightly-concave stalk (2 × the length of r-m); crossvein r-m at proximal half of cell d, aligned to the end of Sc; cell m3 narrowing distally (M2 and M3 converging by the end of cell m3), with stalk slightly longer than r-m, apex of m3 and apex of cell d parallel and unaligned, apex of m3 beyond apex of d; crossvein bm-cu long, base of M3 and CuA1 distant from each other and not appearing as an “X”; cell cup with stalk shorter than r-m; posterior margin of wing slightly convex at distal half; calypters orange, with light-brown margin and fringe of short brown setae; halter with orange stem, white knob. Abdomen. Black, punctate, with sides diverging posteriorly, T2 1.9 × wider than long; vestiture longer and lighter laterally and ventrally, several white macrosetae present on lateral margin of T1 and T2. Male terminalia. Hypopygium barely conspicuous; hypandrium regular-sized (2/3 the width of hypopygium or more), much wider than long, anterior margin straight to slightly convex, posterior margin sharply pointed; gonocoxites free, gonocoxal prolongation thin, smoothly curved inwards, with 2 spines at apex; gonostylus reduced, round, laterally flattened, free, attached to the base of gonocoxite; apex of phallus with three equal-sized prongs; epandrium straight in lateral view; lobes of hypoproct short. Female. Total length, excluding antennae, 5.3–6.2 mm, (n=5); length of thorax, 1.4–1.7 mm, (n=5); length of wing, 4.6–5.4 mm, (n=5); greatest width of abdomen, 1.0–1.3 mm, (n=3). Differs from male as follows: gibbosity that equals ventral 0.5–0.64 of face height; proboscis 0.48–0.55 × the height of head; antenna 0.68–0.8 × as long as the height of eye; antennal insertion at dorsal 0.22–0.4 of head height; postpedicel 1.4–1.5 × length of basal two segments; head 1.3–1.43 × as wide as high; face 0.11–0.14 × as wide as head; mystax comprised of regular golden-brown macrosetae; ocellar tubercle 0.28–0.37 × as wide as frons; anterior ocellus 0.13–0.17 × as wide as frons by the ocellus position; hind tibiae with fine, medium-sized, golden setae ventrally, long, yellow macroseta inserted ventrally on the middle, and long, dark-brown macrosetae anterodorsally; modified tibial setae absent; T2 2.13–2.29 × wider than long; Female genitalia. Three spermathecae; reservoirs cylindrical, disposed in a spiral; spermathecal ducts opening independently at the bursa; genital fork rectangular, U-shaped, arms anteriorly thick, posteriorly truncate, divergent; accessory glands undistinguishable. Morphological variation. Total length, excluding antennae, 5.0–6.3 mm, (n=10); length of thorax, 1.2–1.5 mm, (n=10); length of wing, 4.2–4.9 mm, (n=9); greatest width of abdomen, 0.9–1.2 mm, (n=9). Some specimens differed from the holotype, as follows: gibbosity that equals ventral 0.5–0.7 of face height; lateral occipital setae dark-brown; proboscis 0.35–0.53 × the height of head; proboscis with dark-brown macrosetae, ventrally; antenna 0.7–0.8 × as long as the height of eye; antennal insertion at dorsal 0.2–0.27 of head height; numerous short setae on a row around the scape; postpedicel 1.4–1.8 × length of basal two segments; postpedicel golden-pollinose; head 1.22–1.43 × as wide as high; face 0.07–0.21 × as wide as head; frons silvery-pollinose; orbital setae golden-brown; ocellar tubercle 0.29–0.33 × as wide as frons; anterior ocellus 0.11–0.14 × as wide as frons by the ocellus position; postpronotal lobe black with yellow spot dorsal to mesothoracic spiracle; scutal vestiture dark-brown; longest marginal scutellar macrosetae shorter than scutellum; postalar callosity light-brown; fore and mid tibiae with yellow setulae, long dark-brown macrosetae, and thick spines; tarsi with stout dark-brown setae dorsally and densely covered with thick spine-like golden setae; claws reddish on base and black apically; calypters white, with light-brown margin and fringe of short yellow setae; halter knob pale-yellow; T2 1.63–2.13 × wider than long.

Peru, Bolivia, Brazil (Goiás, Mato Grosso, São Paulo and Paraná) and Argentina.