Heterachthes boliviensis, García & Santos-Silva, 2022

García, Kimberly & Santos-Silva, Antonio, 2022, New species and new records in Neoibidionini and Hexoplonini (Coleoptera: Cerambycidae: Cerambycinae), Zootaxa 5134 (3), pp. 399-414 : 410-412

Heterachthes boliviensis sp. nov.

( Figs 24–29 )

Description. Holotype female. Head capsule reddish brown, dark orangish-brown ventrally and on antennal tubercles; ventral mouthparts dark orangish brown, except pale yellow apex of palpomeres; scape orangish brown, except irregular brownish area near dorsal apex; pedicel orangish brown, lighter toward apex; antennomeres III–XI orangish, slightly darkened on apex of III–X; mandibles orangish-brown, except dark brown margins and almost black apical third. Prothorax dark reddish brown, except brown anterior and posterior margins and area surrounding procoxal cavities. Ventral surface of mesothorax mostly reddish brown, except orangish posterocentral area of mesoventrite, central area of mesoventral process, and brownish margins of mesanepisternum, mesepimeron, and mesoventral process. Metanepisternum reddish brown; metaventrite dark orangish brown anteriorly and laterally, light orangish brown on wide central area, and yellowish close to metacoxal cavities. Elytra brownish on anterior seventh, with two yellowish maculae on each elytron, the anterior one from anterior seventh to slightly after middle, almost reaching epipleural margin and suture; the posterior one smaller, reaching epipleural margin and suture, with its anterior and posterior margins sinuous; with brown transverse macula separating yellowish maculae. Coxae mostly orangish brown; trochanters mostly light orangish brown; femoral peduncle pale yellow; femoral club brownish, except yellowish-brown apex; tibiae orangish-brown basally, pale yellow on remaining surface; tarsi light orangish brown, slightly brownish on apex of tarsomeres I–II. Ventral surface of abdomen reddish brown, except pale yellow apical margin of ventrites 1–4.

Head. Frons finely rugose-punctate; sides of frontal-plate rounded and slightly inclined upward; with distinct sulcus between sides of frontal-plate and lower eye lobes, curved toward anterocentral region; with sparse whitish pubescence, almost absent on central area of frontal-plate. Antennal tubercles moderately elevated and abruptly inclined posteriorly; finely punctate, except smooth apex; with whitish pubescence not obscuring integument. Area between tubercles, finely, abundantly punctate, punctures confluently close to tubercles, and U-shaped sulcus close to anterior margin of upper eye lobes; with sparse whitish pubescence. Vertex finely, sparsely punctate; with slightly, transversely rugose area close to prothorax; and sparse yellowish-white pubescence, almost absent close to prothorax, and one long, erect yellowish seta on each side near eyes. Area behind upper eye lobes smooth close to eye, slightly rugose close to prothorax; with yellowish-white pubescence superiorly close to eye, glabrous on remaining surface. Area behind lower eye lobes finely, sparsely punctate close to eye, smooth close to prothorax; with short, decumbent, very sparse yellowish-white setae on inferior half close to eye, and long, erect yellowish setae on posterior 2/3 close to eye. Genae finely, abundantly punctate, except smooth apex; with whitish pubescence not obscuring integument, absent on smooth apex, and a few long, erect whitish setae toward ventral surface. Wide central area of postclypeus with bristly whitish pubescence not obscuring integument, and one long, erect seta of same color on each side; sides of postclypeus smooth, glabrous. Labrum coplanar with anteclypeus at posterior 2/3, inclined at anterior third; finely, sparsely punctate and with a few short, bristly whitish setae on anterior area of coplanar area; with abundant, bristly whitish pubescence on inclined area, and a few long, erect setae of same color interspersed. Basal 2/3 of outer surface of mandibles rugose-punctate; with sparse whitish pubescence and a few long, erect yellowish-brown setae interspersed; apical third smooth, glabrous. Gulamentum smooth, glabrous on posterior half; anterior half slightly depressed, transversely rugose-punctate, with short, sparse, decumbent yellowish-white setae, denser close to anterior margin, and a few long, erect setae of same color interspersed. Upper eye lobes with two rows of ommatidia, with a single ommatidium near inner apex ( Fig. 29 ); distance between upper eye lobes 0.38 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.48 times distance between outer margins of eyes. Antennae 1.9 times elytral length, reaching elytral apex at base of antennomere IX. Scape subcylindrical, arched in lateral view; finely, sparsely punctate, except smooth apex of dorsal surface; with sparse minute yellowish-white pubescence, absent on smooth area, and a few long, erect yellowish-white setae. Pedicel and antennomeres III–XI with abundant whitish pubescence not obscuring integument; pedicel and antennomeres III–V with long, erect, sparse yellowish-white setae ventrally (sparser toward V) and moderately long, erect, sparse yellowish-white setae on dorsal apex; antennomeres VI–X with moderately short, erect, sparse yellowish-white setae on ventral apex. Antennal formula based on length of antennomere III: scape = 0.57; pedicel = 0.17; IV = 0.72; V = 0.87; VI = 0.87; VII = 0.83; VIII = 0.77; IX = 0.73; X = 0.62; XI = 0.73.

Thorax. Prothorax longer than wide; anterior and posterior constrictions distinct, especially the posterior one; sides slightly rounded between constrictions. Pronotum with five, slightly elevated gibbosities, one subrounded on each side of anterior third; one subrounded, almost indistinct, on each side of posterior third; and another longitudinal, more conspicuous, centrally; finely, sparsely punctate anteriorly and posteriorly, smooth centrally; with abundant yellowish-white pubescence not obscuring integument, almost absent on wide central area, central and posterolateral tubercles, and T-shaped central area of anterior quarter, with long, erect yellowish-white setae interspersed. Sides of prothorax finely, sparsely punctate, except transversely striate anterior area (this area gradually widened toward prosternum); with abundant yellowish-white pubescence close to pronotum, almost absent toward prosternum; with a few long, erect yellowish-white setae superiorly. Prosternum finely, sparsely punctate on sides of posterior half, transversely striate on anterior half, abundantly punctate close to posterior half; in lateral view, distinctly concave centrally; with wide U-shaped yellowish-white pubescent band on posterior half (pubescence slightly denser close to procoxal cavities), almost glabrous on remaining surface. Narrowest area of prosternal process 0.12 times procoxal width. Ventral surface of mesothorax with abundant yellowish-white pubescence not obscuring integument, sparser on posterocentral area of mesoventrite and mesoventral process; posterocentral area of mesoventrite gradually, distinctly elevated toward mesoventral process. Mesoventral process distinctly widened posteriorly; widest area 0.9 times mesocoxal width. Scutellum with sparse whitish pubescence not obscuring integument. Elytra. Coarsely, sparsely punctate; with short, decumbent, very sparse yellowish-white setae, and long, erect, sparse pale-yellow setae; apex truncate, slightly concave centrally. Legs. Femora with abundant yellowishwhite pubescence not obscuring integument, and long, erect setae of same color interspersed. Tibiae with abundant whitish pubescence not obscuring integument, longer, bristly on ventral surface of posterior third, and long, erect setae of same color interspersed. Metatarsomere I slightly longer than II–III together.

Abdomen. Ventrites with abundant whitish pubescence laterally, distinctly sparser centrally on ventrites 1–4, and almost absent on their apex; with a few long, erect yellowish setae interspersed on sides of ventrites 2–5, and apex of ventrite 5; apical margin of ventrite 5 rounded.

Dimensions (mm). Total length, 8.05; prothoracic length, 1.60; anterior prothoracic width, 1.05; posterior prothoracic width, 1.05; maximum prothoracic width, 1.15; humeral width, 1.60; elytral length, 5.25.

Type material. Holotype female from BOLIVIA, La Paz : Sur Yungas, Carmen Pampa, 5500’, black light trap, 11.XI.1976, L. Janicki leg. ( FSCA, formerly RFMC).

Etymology. The specific epithet “ boliviensis ” comes from the country Bolivia, where the holotype was collected.

Remarks. Heterachthes boliviensis sp. nov. is similar to H. concretus Martins, 1970 (see photographs on Bezark 2022), but differs as follows: upper eye lobes with less than four rows of ommatidia; anterior half of the elytra mostly light yellowish brown; posterior quarter of the elytra entirely light yellowish brown. In H. concretus , the upper eye lobes have four rows of ommatidia; anterior half of the elytra has a yellowish-brown macula near middle; and the posterior third of the elytra has a wide yellowish-brown macula with brown area close to its posterior margin, and the elytral apex is yellowish. The new species is also similar to H. pallidipennis (Thomson, 1865) by having less than four rows of ommatidia. However, it differs by the basal antennomeres not carinate, elytral apex truncate, and elytral surface with four to five rows of piliferous punctures. In H. pallidipennis , the basal antennomeres are carinate, elytral apex is rounded, and the elytral surface has two rows of piliferous punctures.

Heterachthes boliviensis sp. nov. can be included in the alternative of couplet “11” from Martins (2009) (translated; modified):

11(8). Upper eye lobes with less than four rows of ommatidia................................................... 11’

- Upper eye lobes with four rows of ommatidia............................................................ 12

11’(11). Elytra with arched dark brown band on anterior half and two rows of erect setae. Chile (?), Peru............................................................................................ H. pallidipennis (Thomson, 1865)

- Elytra without arched dark brown band on anterior half, and rows or erect setae more abundant and somewhat irregular. Bolivia (La Paz)................................................................... H. boliviensis sp. nov.

Figures

FIGURES 24–29. Heterachthes boliviensis sp. nov., holotype female: 24) Dorsal habitus; 25) Ventral habitus; 26) Lateral habitus; 27) Head, frontal view; 28) Procoxal cavities; 29) Upper eye lobe.