Nealcidion albosetosum, Vlasak & Santos-Silva, 2025

Nealcidion albosetosum sp. nov.

( Figs 45–49 View FIGURES 45–49 )

Description. Male holotype. Integument mostly dark brown; ventral mouthparts both orangish brown and brown, except palpomeres dark brown with yellowish apex; anteclypeus reddish brown; labrum reddish brown on posterior 2/3, yellowish brown on anterior third; scape and pedicel brown; antennomere III light brown except brown apex; antennomeres IV–X orangish brown except brown apical region, dark area gradually wider toward X; antennomere XI orangish brown. Pronotum with eight oblong blackish maculae, four on anterior half and four on posterior half, two irregular, located laterally and two subcircular located on each side of middle. Elytra with blackish spots and oblong blackish band after middle of dorsal surface. Meso- and metafemoral peduncles dark reddish brown; tibiae light reddish brown on basal third, reddish brown on apical third, orangish on central third; meso- and metatarsomeres I light reddish brown, except dark-brown apex. Abdominal ventrites both dark brown and dark reddish brown (reddish area gradually lighter toward ventrite 5), except orangish-brown apex of ventrites 2–4.

Head. Frons abundantly, minutely punctate; inferior half with abundant light yellowish-brown pubescence not obscuring integument, centrally projected upward, pubescence denser laterally and centrally close to postclypeus, with a few minute, thick, decumbent white setae interspersed; remaining surface with abundant brown pubescence not obscuring integument, with sparse, minute, thick, decumbent white setae interspersed, except yellowish-brown pubescence close to eye; with one long, erect dark-brown seta close to eyes. Antennal tubercles with abundant brown pubescence not obscuring integument, with short, thick, decumbent white setae interspersed, except yellowish-brown pubescence on apex and laterally on frontal area. Area between anterior margin of antennal tubercles and posterior margin of upper eye lobes with abundant brown pubescence partially obscuring integument, with a few short, thick, decumbent white setae interspersed, except glabrous median groove, and two diamond-shaped central areas, one located between antennal tubercles and eyes, another posteriorly, and dense pale-yellow pubescence close to eyes; area of vertex close to prothorax with sparse yellowish-white pubescence; with a few long, erect dark-brown setae close to eyes. Area behind eyes with dense pale-yellow pubescence close to eye, glabrous close to prothorax. Genae with somewhat sparse yellowish-white pubescence, except glabrous apex; with a few long, erect dark-brown setae interspersed. Gulamentum smooth, glabrous, except abundant whitish pubescence on intermaxillary process. Wide central area of postclypeus with abundant light yellowish-brown pubescence not obscuring integument close to frons, except glabrous central area, and sparse yellowish-white pubescence close to anteclypeus, except glabrous central area; with one long, erect dark-brown seta on each side near frons and long, erect yellowish-brown and dark-brown setae laterally close to anteclypeus. Labrum with abundant yellowish pubescence not obscuring integument on posterior half, glabrous on anterior half, except dense fringe of short golden setae anterocentrally; with long, erect setae about middle, setae dark brown about basal half, yellowish-brown on remaining surface. Outer surface of mandibles triangularly depressed on basal half, with somewhat abundant yellowish pubescence and a few long, erect dark-brown setae interspersed on depressed area; remaining surface glabrous. Distance between upper eye lobes 0.19 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.52 times distance between outer margins of eyes. Antennae 2.55 times elytral length, reaching elytral apex near apex of antennomere V. Scape with somewhat abundant brown pubescence distinctly not obscuring integument dorsally and on inner surface, except apex with both whitish and yellow pubescence, outer surface with abundant yellowish pubescence, except apex with yellow pubescence, and ventral surface with somewhat abundant yellowish-white pubescence distinctly not obscuring integument; all surfaces with sparse, short, thick, decumbent white setae interspersed; apical third of ventral surface with a few long, erect dark-brown setae interspersed. Pedicel with dense yellow pubescence on base of dorsal surface and outer surface, mostly glabrous on remaining basal surface, and abundant dark yellowish-brown pubescence not obscuring integument on remaining surface; ventral surface with a few long, erect yellowish-brown setae. Antennomeres III–XI with abundant yellowish pubescence not obscuring integument, except yellowish-brown pubescence on dark integumental area of III–X; III–V with long, erect yellowish-brown setae interspersed ventrally; III and XI distinctly widened on inner apical region. Antennal formula based on length of antennomere III: scape = 0.76; pedicel = 0.10; IV = 0.77; V = 0.59; VI = 0.53; VII = 0.49; VIII = 0.53; IX = 0.53; X = 0.52; XI = 0.42.

Thorax. Prothorax wider than long; sides rounded about middle; anterior constriction distinct. Pronotum with slightly elevated, subcircular gibbosity on each side of anterior third and another slightly elevated, elongated, located centrally from about middle to posterior quarter; with coarse punctures forging irregular transverse row on posterior quarter, and a few shallow, coarse punctures on remaining surface; with oblique yellow pubescent band on each side of central region, from anterior constriction to posterior coarse punctures; with longitudinal yellow pubescent band laterally, surrounding outer surface of lateral blackish macula and part of inner surface of posterior blackish macula; blackish maculae with dense black pubescence; area between four inner blackish maculae with abundant brownish pubescence, more yellowish-brown toward posterior margin, with short, decumbent, thick white setae close and between the blackish maculae, more abundant on anterior half, except sparser pubescence on anterior third, pale-yellow pubescence close to anterior area of central gibbosity, yellowish pubescence laterally between anterior and posterior gibbosities, central gibbosity partially glabrous; area between innermost and outermost blackish maculae mostly with abundant brown pubescence with short, decumbent thick white setae interspersed; sides of area close to posterior margin with abundant yellowish pubescence not obscuring integument, except glabrous posterior sulcus, and short, decumbent, thick white setae; anterior sulcus glabrous. Sides of prothorax with abundant brown pubescence close to prothorax and abundant yellowish pubescence close to prosternum, with short, decumbent, thick white setae interspersed, except glabrous anterior sulcus. Prosternum with abundant yellowish-white pubescence not obscuring integument, except glabrous anterior sulcus. Prosternal process with abundant whitish pubescence not obscuring integument; sides and posterior margin concave; narrowest area 0.45 times procoxal width. Central area of mesoventrite with abundant whitish pubescence not obscuring integument; remaining surface with abundant, both yellowish and whitish pubescence. Mesoventral process longitudinally carinate centrally; with abundant whitish pubescence, except glabrous posterocentral area; narrowest area 0.57 times mesocoxal width. Mesanepisterna with abundant yellowish-white pubescence close to anterior region of mesoventrite and prothorax and abundant brown pubescence on remaining surface; with short, decumbent, thick white setae interspersed. Mesepimera with abundant brown pubescence, except yellow pubescence close to elytron. Metanepisterna with abundant brown pubescence, except pale-yellow pubescence close to mesepimeron; with short, decumbent, thick white setae interspersed. Metaventrite with abundant brown pubescence close to metanepisterna, with short, decumbent, thick white setae interspersed, whitish pubescence not obscuring integument centrally, and abundant, both whitish and yellowish pubescence between the two former areas, with long, suberect yellowish setae interspersed. Scutellum with abundant yellowish-brown pubescence centrally on anterior 3/4, abundant brownish pubescence on apical quarter, and abundant black pubescence on remaining surface. Elytra. Sides slightly convergent on anterior 3/4, distinctly convergent on posterior quarter; apex obliquely truncate, making the outer angle triangularly projected, and sutural angle slightly triangularly projected; sides of anterior quarter with small tubercles; moderately abundantly, coarsely punctate, punctures gradually finer and sparser from middle; centrobasal crest moderately elevated, with abundant, moderately short, bristly brown setae; black spots with dense, bristly black pubescence; black oblique macula with dense black pubescence; remaining surface with dense dark yellowish-brown pubescence, lighter on part of anterior sixth, except two dashed pale-yellow pubescent bands dorsally on anterior half, innermost less distinct and shorter, oblique yellow pubescent band close to anterior margin of black macula, two longitudinal, yellow pubescent bands dorsally on posterior half, innermost distinctly longer, oblique yellow pubescent band apically, reaching outer angle, dashed yellowish pubescent band between dorsal and epipleural regions, not reaching apex, and dashed yellowish pubescent band on epipleural margin, pubescence gradually paler toward apex; with sparse, short, decumbent, thick white setae interspersed, except on black pubescent areas. Legs. Coxae and trochanters with abundant whitish pubescence. Femora with abundant yellowish-white pubescence, except sparser brown pubescence on wide dorsal macula on base of femoral club, sparser brown pubescence on wide macula on posterior half of femoral club, from dorsal to lateral surfaces, and abundant yellowish pubescence on apex; with short, decumbent, thick white setae interspersed. Basal 2/3 of tibiae with dense orangish pubescence; apical third of protibiae with abundant dark yellowish-brown pubescence dorsally and laterally, and dense, bristly yellowish-brown pubescence ventrally; apical third of mesotibiae with abundant, short, bristly yellowish-brown setae dorsally and ventrally, and abundant both whitish and yellowish pubescence laterally; apical third of metatibiae with sparse, both yellowish-brown and whitish pubescence dorsally and laterally, and dense, bristly yellowish-brown pubescence ventrally; meso- and metatibiae with long, erect yellowish-brown setae interspersed; all tibiae with short, decumbent, thick white setae interspersed. Dorsal surface of tarsomeres I with abundant yellowish pubescence, except distinctly sparse brown pubescence on apex; dorsal surface of pro- and mesotarsomeres II–IV with moderately abundant brown pubescence; dorsal surface of metatarsomeres II with moderately abundant yellowish and whitish pubescence on basal 3/4 and sparse dark-brown pubescence on apical quarter; dorsal surface of metatarsomeres III–IV with abundant dark-brown pubescence; tarsomeres V with abundant yellowish-white pubescence on basal 2/3 and moderately sparse dark-brown pubescence on apical third; tarsomeres I–II and V with a few long, erect dark-brown setae laterally; metatarsomere I longer than II–III together.

Abdomen. Ventrites 1–4 with abundant yellowish pubescence not obscuring integument laterally and abundant whitish pubescence not obscuring integument centrally, except glabrous apex of 2–4; ventrite 5 with abundant whitish pubescence not obscuring integument; apex of ventrite 5 concave.

Dimensions (mm). Total length, 13.55; prothoracic length, 2.20; anterior prothoracic width, 2.55; posterior prothoracic width, 3.10; maximum prothoracic width, 3.50; humeral width, 5.25; elytral length, 10.00.

Type specimen. Male holotype from ECUADOR, Napo: Sendero Jumandi , 2200 m, on wood during day, 3 Sep 2024, J. Vlasak leg. ( MZSP, formerly JVCO) .

Etymology. The name “ albosetosum ” refers to the short but distinct, thick white setae on most areas of the body.

Remarks. Nealcidion albosetosum sp. nov. is similar to N. antennatum Monné & Monné, 2009 (see photograph on Bezark 2025 and in Monné & Monné 2009), but differs as follows: pronotum with eight large black maculae; elytra with large black maculae on posterior half; posterior half of elytra with two longitudinal yellow pubescent bands; and tibiae mostly light. In N. antennatum , the pronotum has two large black maculae, the elytra do not have large black macula on the posterior half, the posterior half of the elytra does not have longitudinal yellow pubescent bands, and the tibiae are mostly dark.