Scythropopsis nigritarsis ( White, 1855 ) Santos-Silva & Botero & Wappes, 2020

Santos-Silva, Antonio, Botero, Juan Pablo & Wappes, James E., 2020, Neotropical Acanthoderini (Coleoptera, Cerambycidae, Lamiinae): Synonymies and new status in some genera, new species, transferences and new distributional records, Papéis Avulsos de Zoologia 60, pp. 1-40 : 7-10

Scythropopsis nigritarsis ( White, 1855) , comb. nov. ( Figs. 43-54 )

Acanthoderes nigritarsis White, 1855: 363 ; Gemminger, 1873: 3146 (cat.); Bates, 1880: 141 (distr.); Gahan, 1892: 264 (syn.); Blackwelder, 1946: 611 (checklist); Chemsak et al., 1992: 130 (cat.); Noguera & Chemsak, 1996: 406 (cat.); Chemsak & Hovore, 2002b: 11.

Acanthoderes (Psapharochrus) nigritarsis ; Aurivillius, 1923: 387 (cat.); Gilmour, 1965: 613 (cat.); Monné & Giesbert, 1994: 231 (checklist); Monné, 1994: 231 (cat.).

Psapharochrus nigritarsis ; Turnbow et al., 2003: 29 (distr.); Monné, 2005: 209 (cat.); Hovore, 2006: 376 (distr.); Swift et al., 2010: 46 (distr.); Monné, 2019: 302 (cat.).

Acanthoderes sylvanus Bates, 1880: 141, 1885: 378 .

Acanthoderes sylvana ; Lameere, 1883: 62 (checklist).

Description: Female ( Figs. 48-52 ): Integument black, slightly more dark brown on some areas.

Head: Frons, vertex, and area behind eyes with dense, white, yellowish-brown, and pale-yellow pubescence mixed; with sparse, long, erect dark setae close to eyes. Genae with dense pubescence as on dorsal surface of head close to eye, narrow area close to frons glabrous, distinctly sparser on wide remaining surface, with a few long, erect dark setae interspersed. Postclypeus with dense, long white, yellowish-brown, and pale-yellow pubescence intermixed, with sparse, long, erect dark setae interspersed, central area and sides glabrous. Posterior ⅔ of labrum coplanar with anteclypeus, inclined at anterior third; with dense white, yellowish-brown, and pale-yellow pubescence intermixed on sides of posteri- or ⅔ (whiter and shorter toward central area), distinctly sparser centrally, sparse on inclined area, especially centrally, and with fringe of yellowish-brown setae at anteri- or margin; with transverse, sparse row of long, erect, dark setae centrally. Gulamentum slightly convex, posterior ⅔ glabrous, depressed, finely punctate, anterior third with short yellowish-brown pubescence not obscuring integument. Distance between upper eye lobes 0.62 times length of scape; in frontal view, distance between lower eye lobes 0.94 times length of scape. Antennae 1.2 times elytral length, reaching posterior seventh of elytra.Scape clavate, flattened dorsally at basal third; with brown pubescence not obscuring integument, with short, moderately abundant white pubescence interspersed on posterior ⅔, except narrow posterior area with dense white pubescence; with a few long, erect dark setae on posterior region of ventral surface. Antennomeres with basal white pubescent ring, gradually narrower toward posterior segments (pubescence sparser on III), and remaining surface with brown pubescence not obscuring integument; pedicel and antennomeres III-VI with sparse,

long, erect dark setae ventrally (gradually shorter,sparser toward VI). Antennal formula (ratio) based on length of antennomere III: scape = 0.80; pedicel = 0.23; IV = 0.77; V = 0.46;VI = 0.36;VII = 0.35;VIII = 0.27; IX = 0.23; X = 0.19; XI = 0.19.

Thorax: Lateral tubercle of prothorax large, conical, slightly curved upward, with apex blunt. Pronotum with large, wide tubercle on each side, gradually elevated from posterior quarter toward anterior quarter, with more elevated area slightly bifid at top; with narrow, carina-shaped tubercle centrally, from posterior sulcus to anterior margin, gradually widened toward posterior sulcus; posterior sulcus well-marked; coarsely, sparsely punctate between tubercles, forming transverse row in posterior sulcus, and a few coarse punctures on dorsal surface of lateral tubercles of prothorax; with dense, white, yellowish-brown, and pale-yellow pubescence intermixed, with a few long, erect dark setae interspersed on sides of posterior area, greenish-brown pubescent band adjacent to outer side of lateral tubercles of pronotum, widened anteriorly and posteriorly, anterior ¾ of central tubercle glabrous, anterior apex of lateral tubercles of pronotum nearly glabrous; posterior fourth with white pubescent band centrally. Sides of prothorax coarsely, sparsely punctate; with dense, white, yellowish-brown, and pale-yellow pubescence intermixed. Prosternum with white, yellowish-brown, and pale-yellow pubescence intermixed, denser on some areas. Prosternal process 0.75 times width of procoxal cavity, coarsely rugose-punctate, longitudinally sulcate centrally, with apex strongly emarginate; pubescence with same color as on prosternum, distinctly sparser toward apex. Ventral surface of mesothorax with dense, white, yellowish-brown, and pale-yellow pubescence intermixed laterally, yellowish-brown centrally. Mesoventral process 1.5 times width of mesocoxal cavity, with one distinct tubercle each side of anterior area; with white, yellowish-brown, and pale-yellow pubescence intermixed, not obscuring integument. Ventral surface of metathorax with dense, white, yellowish-brown, and pale-yellow pubescence intermixed, sparser centrally. Scutellum with dense yellowish-brown pubescence on anterocentral area, with white pubescence interspersed, narrow white pubescent band on central area of posterior third, and brown pubescence on remaining surface. Elytra: Humeri somewhat projected forward; with elevated centrobasal crest covered with small tubercles between humeri and scutellum, and distinct carina from apex of centrobasal crest to near apex; posterior margin concave, with out- er angle distinctly triangularly projected; pubescence dense, mostly white, yellowish-brown, and pale-yellow pubescence intermixed, with dense, slightly oblique, wide white pubescent band laterally on anterior third, small greenish-brown spots surrounding punctures, and irregular areas with greenish-brown pubescence; with sparse, moderately long, erect dark setae throughout. Legs: Femora with dense, white, yellowish-brown, and pale-yellow pubescence intermixed. Tibiae with moderately dense, white, yellowish-brown, and pale-yellow pubescence intermixed on dorsal and lateral sides of basal area, and wide central area (this later area somewhat projected toward apex along outer surface), with white pubescence on ventral surface of basal area and dorsal surface of apex, and brownish pubescence on remaining surface, not obscuring integument; with long, erect, sparse dark setae. Tarsomeres I and V with mostly white pubescence dorsally, and remaining segments with brownish pubescence not obscuring integument.

Abdomen: Ventrites with white, yellowish-brown, and pale-yellow pubescence intermixed, sparser on wide central area of V; apex of ventrite V nearly truncate.

Dimensions (mm): Total length, 16.7;prothoracic length, 3.2; anterior prothoracic width, 4.2; posterior prothoracic width, 4.4; maximum prothoracic width, 5.9; humeral width, 7.2; elytral length, 11.9.

Material examined: MEXICO, Chiapas (new state record): Reserva Biosfera El Triunfo, 15°39′N, 92°49′W, 1 female, 15.XI.2001, C.W. O’Brien col. ( FWSC) . Oaxaca: MX 175, 5 km N Portillo de Rayo, 2 males, 20.X.2005, F. Skillman & B. Eya col. ( FWSC; MZSP) .

Known geographical distribution ( Monné, 2019; Tavakilian & Chevillotte, 2019; new record): Mexico (Oaxaca, Chiapas), Guatemala, Honduras, Costa Rica.

Remarks: The outer angle of the elytral apex in the female examined is more triangularly projected than in the two males examined. However, based on the study of other species of the genus, as well as similar genera, this feature is considered a variation. The elytral pubescence, in S. nigritarsis varies widely as it does in other species of the genus.

The finely granulate eyes and distinct elytral carina observed in photographs of the holotype and the other material examined ensure us that the species belongs to Scythropopsis .

Figures

Figures 43-54. Scythropopsis nigritarsis. (43‑47) Male. (43) Dorsal habitus. (44) Ventral habitus.(45) Lateral habitus.(46) Lower eye lob. (47) Head, frontal view. (48‑52) Female. (48) Head, frontal view. (49) Lower eye lobe. (50) Dorsal habitus. (51) Ventral habitus. (52) Lateral habitus. (53) Holotype male, dorsal habitus. (54) Acanthoderessylvanus, holotype male,dorsal habitus.