Coleoxestia unap, Santos-Silva & Hernandez, 2025

Coleoxestia unap sp. nov.

( Figs 21–28 View FIGURES 21–28 , 31 View FIGURES 29–31 )

Description. Male holotype. Head capsule black, except dark brown antennal tubercles and sides of postclypeus; ventral mouthparts reddish brown except yellowish-brown apex of palpomeres; antennae dark brown basally, gradually brown toward distal segments, except brown sensorial area on dark brown basal flagellomeres. Prothorax black, except dark brown prosternal process. Ventral surface of meso- and metathorax dark brown. Scutellum mostly dark brown. Elytra black basally, gradually dark brown toward apex, except irregular, large dark reddish-brown macula near apex. Femora dark brown basally and apically, dark reddish brown on remaining surface. Tibiae dark brown, except dark reddish-brown apex. Tarsi dark brown. Abdominal ventrites dark brown, more dark reddish brown depending on light intensity, especially on ventrite 5, except brownish apex of ventrites 2–4.

Head. Frons moderately abundantly and finely punctate laterally, smooth centrally and on frontal plate; area on each side of median groove close to frontal plate with carinate; superior central area longitudinally, moderately deeply sulcate; area on sides of frontal plate sulcate; frontolateral depression moderately well marked, not reaching antennal tubercles ( Figs 24–25 View FIGURES 21–28 ); nearly all punctures with minute white seta; remaining surface glabrous. Area between antennal tubercle sulcate centrally, this sulcus continues frontal sulcus; with a few minute white setae. Area between antennal tubercles and posterior margin of upper eye lobes moderately longitudinally sulcate centrally, with longitudinal, slightly elevated carina close to central sulcus, depressed close to eyes; central sulcus moderately abundantly, finely punctate; area close to eyes coarsely, confluently punctate; with a few long, erect yellowish setae laterally, glabrous on remaining surface. Remaining surface of vertex abundantly, coarsely punctate, glabrous. Area behind upper eye lobes abundantly, coarsely punctate; with a few long, erect yellowish setae near eye, glabrous on remaining surface. Area behind lower eye lobes transversely sulcate near eye; area close to eye smooth superiorly, abundantly, moderately coarsely punctate toward ventral surface; transverse sulcus smooth; wide area close to prothorax abundantly, coarsely punctate; with sparse whitish pubescence close to eyes, pubescence sparser superiorly; with long, erect yellowish setae interspersed on inferior area close to eye; remaining surface glabrous. Genae abundantly, moderately coarsely punctate toward ventral surface and frontally close to eye, smooth on remaining surface; with sparse, minute white pubescence on punctate area, glabrous on smooth area. Antennal tubercles moderately well-separated; sparsely, finely punctate, except smooth apex; punctures with minute white seta; smooth area glabrous. Wide central area of postclypeus transversely close to frontal plate and anteclypeus; finely, sparsely punctate; a few punctures with minute white seta; with a few long, erect yellowish-brown setae laterally. Sides of postclypeus smooth, glabrous. Labrum almost coplanar with anteclypeus posteriorly, almost vertical anteriorly; with very sparse whitish pubescence and long, erect yellowish-brown setae laterally. Gulamentum sparsely, coarsely punctate, glabrous on posterior 2/3; anterior third slightly depressed, moderately abundantly, shallowly, coarsely punctate, with abundant whitish pubescence not obscuring integument and long, erect yellowish-brown setae interspersed. Basal 2/3 of outer side of mandibles coarsely vermiculate, with sparse, short, decumbent white setae and long, erect yellowish-brown setae interspersed; anterior third smooth, glabrous. Distance between upper eye lobes 0.20 times distance between outer margins of eyes; in ventral view, distance between lower eye lobes 0.36 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.42 times distance between outer margins of eyes. Antennae 1.4 times elytral length, reaching elytral apex at apical quarter of antennomere XI. Scape abundantly, moderately coarsely rugose-punctate on basal half, moderately sparsely, finely punctate on remaining dorsal and lateral surfaces, except smooth apex of dorsal surface; ventral surface moderately sparsely coarsely rugose-punctate; nearly all punctures with minute white seta; with sparse, long, erect yellowish-brown setae interspersed dorsally and laterally, erect setae longer laterally. Pedicel moderately abundantly finely punctate, except smooth dorsal apex; with sparse, minute whitish pubescence, except glabrous smooth area, and long, erect yellowish-brown setae interspersed laterally and ventrally. Antennomere III abundantly, finely punctate, except smooth entire base and apex of dorsal surface; with abundant white pubescence not obscuring integument, except glabrous smooth areas; with long, erect yellowish-brown setae interspersed laterally, ventrally, and dorsally near apex; outer apex obtusely-angulose ( Fig. 25 View FIGURES 21–28 ); sensorial area restricted to apical third, divided by longitudinal carina, with abundant yellowish-white pubescence not obscuring integument. Antennomeres IV–VII abundantly, minutely punctate, except smooth dorsal apex; with abundant white pubescence not obscuring integument; with long, erect yellowish-brown setae as on III, except on sensorial area; outer apex sub-spiniform; sensorial area from near base to apex, divided by longitudinal carina, with abundant yellowish-white pubescence not obscuring integument. Antennomeres VIII–X with pubescence and sensorial area as on VII; V with a few moderately long, erect yellowish-brown setae interspersed laterally, ventrally, and near dorsal apex, except on sensorial area; outer apex triangularly projected. Antennomere XI narrowed on distal third; entire microsculptured, with abundant white pubescence not obscuring integument. Antennal formula (ratio) based on antennomere III (not including the apical projection of some antennomeres): scape = 0.67; pedicel = 0.13; IV = 0.55; V = 0.58; VI = 0.60; VII = 0.56; VIII = 0.55; IX = 0.55; X = 0.50; XI = 0.82.

Thorax. Prothorax slightly wider than long; anterior margin convex; posterior margin somewhat sinuous; anterior and posterior constrictions well marked; sides slightly rounded, sinuous between constrictions, slightly rounded close to posterolateral angles. Pronotum depressed on anterior quarter and posterior fifth; mostly smooth on anterior sixth; moderately longitudinally gibbous centrally from middle to posterior quarter; irregularly rugose on wide central area, from anterior to posterior quarter; with moderately sparse, coarse punctures on sides of central gibbosity; sides of wide central area coarsely rugose-punctate; posterior sixth transversely, moderately deeply sulcate; glabrous, except a few long, erect yellowish-brown setae on sides of posterior third. Side of prothorax coarsely rugose-punctate on wide central area, except smooth area close to prosternum, transversely bisulcate, subsmooth close to posterior margin, sulcate, subsmooth near anterior margin, except striate area close to prosternum; with very sparse, minute white pubescence anteriorly and posteriorly, pubescence absent centrally, and long, erect yellowish-brown setae interspersed. Sides of posterior 3/4 of prosternum smooth, glabrous, with a few long, erect yellowish-brown setae. Remaining posterior half of prosternum with minute, very sparse punctures and a few coarse punctures interspersed; sulcate close to procoxal cavities; with sparse white pubescence laterally and close to procoxal cavities, almost absent on remaining surface; with a few long, erect whitish setae. Anterior half of prosternum subsmooth close to anterior margin, with two transverse sulci in addition to anterior sulcus; with very sparse, minute, decumbent white setae. Sides of prosternum longitudinally sulcate on anterior 3/4; with abundant white pubescence not obscuring integument laterally, almost glabrous centrally; narrowest area 0.43 times procoxal width. Mesoventrite with moderately sparse whitish pubescence centrally and abundant whitish pubescence not obscuring integument laterally. Mesanepisterna and mesepimera with abundant whitish pubescence partially obscuring integument, except abundant yellowish pubescence not partially obscuring integument close prothorax on mesanepisterna and close to elytra on mesepimera. Mesoventral process slightly tumid laterally close to mesoventrite; sides concave and apex distinctly notched; with abundant white pubescence laterally and sparse pubescence centrally; narrowest area 0.79 times mesocoxal width. Metanepisterna with dense whitish pubescence. Metaventrite sparsely, finely punctate; with abundant white pubescence close to metanepisterna and meso- and metacoxal cavities; remaining surface with very sparse, minute, decumbent white setae; with a few both moderately short, erect whitish setae and long, erect yellowish-brown setae. Scutellum with very sparse, minute, decumbent yellowish setae, except short fringe of yellowish setae on margins. Elytra. Somewhat rugose on anterior quarter; remaining surface with slightly distinct, irregular reticular lines, almost indistinct from middle; moderately sparsely, minutely punctate ( Fig. 21 View FIGURES 21–28 ); apex subtruncate, with long spine on outer and sutural angles; with a few moderately short, bristly, both whitish and yellowish-brown setae apically. Legs. Femora sparsely, finely punctate; inner and outer apices of profemora rounded, slightly projected; outer apex of meso- and metafemora rounded, slightly projected, and inner apex shortly, triangularly projected; with sparse, minute whitish pubescence dorsally and laterally; with moderately abundant whitish pubescence not obscuring integument ventrally, with long, erect yellowish-brown setae interspersed; basal half of dorsal surface of metafemoral club with abundant, bristly, yellowish-brown setae. Protibiae with very sparse, decumbent, short white setae dorsally, laterally, and on basal half of ventral surface; with dense, bristly, yellowish-brown pubescence on apical half of ventral surface; with sparse, long, erect yellowish-brown setae dorsally and laterally. Meso- and metatibiae with white setae as on protibiae; apical third of dorsal surface with sparse, moderately long, erect yellowish-brown setae; apical 2/3 of inner surface with long, erect yellowish-brown setae, setae more abundant toward apex; apical 2/3 of outer surface with moderately sparse and long, erect yellowish-brown setae; apical 2/3 of ventral surface with moderately long, erect yellowish-brown setae, setae distinctly denser apically; apical sixth of ventral surface with dense, bristly yellowish-brown pubescence. Dorsal surface of tarsi with moderately abundant whitish pubescence not obscuring integument, pubescence mostly absent on V, and moderately abundant, short, bristly yellowish-brown setae interspersed.

Abdomen. Ventrites very sparely, minutely punctate; with very sparse, minute, decumbent white setae, slightly more abundant on apical third of ventrite 5, except glabrous apex of ventrites 1–4; with a few, both short and long, erect yellowish-brown setae interspersed centrally, erect setae slightly more abundant on apical third of ventrite 5; apex of ventrite 5 slightly concave centrally.

Dimensions in mm. Total length, 28,05; length of prothorax, 4.85; anterior width of prothorax, 3.80; posterior width of prothorax, 5.00; maximum width of prothorax, 5.05; humeral width, 6.95; elytral length, 19.65.

Type material. Male holotype from PERU, Loreto: El Milagro , “altura km 21 carretera Iquitos Nauta,” 1.III.2004, J.J. Ramírez leg. ( MZSP, formerly JJRH) .

Etymology. The species-group name is the acronym of the “Universidad Nacional de la Amazonía Peruana (UNAP),” alma mater of the second author, and is used as a noun in apposition.

Remarks. The key from Martins & Monné (2005) leads Coleoxestia unap sp. to the alternative of couplet “22” with Coleoxestia denticornis ( Gahan, 1892) (see photographs on Bezark (2025) and in Santos-Silva & Wappes (2017)). However, the scape in C. denticornis is distinctly opaque and sparsely and minutely punctate. In C. unap , the scape is shiny, moderately abundantly and coarsely punctate. If the apex of the antennomere III is considered as not projected, the key from Martins & Monné (2005) leads Coleoxestia unap sp. to the alternative of couplet “38” with Coleoxestia errata Martins & Monné, 2005 (see photographs of the holotype male on Bezark (2025) and in Santos-Silva & Wappes (2017)). However, C. unap differs by the body stouter ( Fig. 21 View FIGURES 21–28 ) (slender in both sexes of C. errata ), apex of the antennomere III ( Fig. 25 View FIGURES 21–28 ) not distinctly rounded (distinctly rounded in C. errata ), femoral peduncle wider ( e.g., base of the mesofemoral peduncle times 0.78 the apical width of the mesofemoral club) (slender, base of the mesofemoral peduncle 0.59 times the apical width of the mesofemoral club in the holotype male).

The key from Eya & Chemsak (2005) leads the new species to the alternative of couplet “12) with Coleoxestia curoei Eya & Chemsak (2005) (see photographs on Bezark (2025) and in Eya & Chemsak (2005)). However, the elytra in C. curoei are distinctly shiny, while they are opaque in C. unap . Furthermore, the apex of the antennomere III is rounded in C. curoei , while it is projected in C. unap ( Fig. 25 View FIGURES 21–28 ). However, if the femora is considered as bicolored, the key leads C. unap to C. rubromaculata ( Gounelle, 1909) ( Figs 29–30 View FIGURES 29–31 ; see also photographs on Bezark (2025) and in Eya & Chemsak (2005)), which differs by the femora distinctly bicolorous (slightly bicolorous in C. unap ), by the apex of the antennomere IV not spiniform (distinctly spiniform in C. unap ) and by the elytral punctures ( Fig. 31 View FIGURES 29–31 ) more abundant and slightly coarser (sparser and finer ( Fig. 30 View FIGURES 29–31 ) in C. unap ).