Leptostylus panamensis, Heffern & Santos-Silva, 2022

Heffern, Daniel & Santos-Silva, Antonio, 2022, Description of two new Panamanian species of Acanthocinini and notes on Eleothinus abstrusus Bates (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 5178 (3), pp. 256-264 : 259-262

Leptostylus panamensis sp. nov.

( Figs 5–8 )

Description. Holotype female. Integument mostly reddish brown; superior area of frons brown; vertex, area behind eyes dark brown; scape and antennomeres III–IV with irregular brown and dark brown maculae dorsally and laterally; antennomeres V–X dark brown basally and apically, dark orangish brown centrally; antennomere XI dark brown basally, dark orangish brown on remaining surface. Pronotum brown, except three small dark brown maculae close to anterior margin, elongated blackish macula on center of posterior half, from posterior margin to about middle, with sinuous sides and narrowed toward middle of pronotum, one large blackish spot on each side close to posterior margin, and large blackish macula laterally, from posterior margin to lateral tubercle, continuing obliquely on side of prothorax. Sides of prothorax brown with irregular dark reddish brown areas, except blackish posterior macula. Prosternum with irregular blackish areas. Sides of ventral surface of mesothorax brown; metaventrite mostly dark brown. Scutellum brown, with irregular blackish spot on each side of base. Elytra lighter on posterior half, especially close to apex; some tubercles dark brown and some orangish brown; with large inverted comma-shaped blackish macula on dorsal surface of anterior third, and large, irregular dark brown macula close to suture from after middle to near posterior fifth. Femora with irregular brown and dark brown maculae on dorsal and lateral surfaces; tibiae with three dark brown maculae dorsally and laterally, one on anterior third, one on posterior third, another centrally, which is smaller on meso- and metatibiae. Ventrites 1–4 with circular brown spots interspersed.

Head. Frons very finely, abundantly punctate; with somewhat thick, both pale yellowish-brown and white pubescence partially obscuring integument on third close to clypeus; scale-shaped, mostly whitish on remaining surface, with sparse pale yellowish-brown scale-shaped setae interspersed, yellower close to median groove, except scale-shaped yellowish-brown pubescence centrally close to eyes, projected toward antennal tubercles, and subcircular spots with sparser, scale-shaped dark yellowish-brown pubescence; with one long, erect brown seta close to eye. Area between antennal tubercles with scale-shaped yellowish-brown pubescence partially obscuring integument. Remaining surface of vertex with yellowish-brown pubescence obscuring integument, with irregular brown pubescent maculae interspersed, except pale yellow pubescence close to inner margin of eyes, glabrous median groove and area close to prothorax on vertex and behind upper eye lobes and superior half of lower eye lobes. Genae with abundant, somewhat thick pale yellow pubescence, with whitish pubescence interspersed, except glabrous apex and almost glabrous superior area close to frons, and brownish pubescent spot centrally. Antennal tubercles with dense, somewhat thick pubescence, whitish on some areas, mostly yellowish-brown on others. Wide central area of postclypeus with pubescence as on frons posterocentrally, almost glabrous on remaining surface, and long, erect yellowish-brown seta on each side; sides of postclypeus glabrous. Labrum with short, sparse yellowish pubescence laterally, long, erect yellowish-brown setae on posterior half, and short fringe of yellow setae on anterior margin. Upper eye lobes somewhat wide, with six rows of ommatidia; distance between upper eye lobes 0.24 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.60 times distance between outer margins of eyes. Antennae 1.45 times elytral length, reaching elytral apex at basal area of antennomere X. Scape gradually widened toward apex; with abundant yellowish-white pubescence partially obscuring integument, except yellowish-brown pubescence on areas with brown integument, dark pubescence on areas with dark brown integument, and short, decumbent, sparse yellow setae interspersed. Pedicel with yellowish pubescence not obscuring integument on basal 2/3, sparser mostly dark on posterior third. Antennomeres III and IV with pubescence as on scape; antennomere III slightly arched. Antennomeres V–XI with yellowish pubescence, distinctly sparser on dark areas. Antennal formula (ratio) based on length of antennomere III: scape = 0.70; pedicel = 0.11; IV = 0.80; V = 0.15; VI = 0.14; VII = 0.14; VIII = 0.14; IX = 0.14; X = 0.14; XI = 0.18.

Thorax. Prothorax wider than long; lateral tubercles large, somewhat conical with blunt apex, located on middle; with rounded projection close to anterior margin. Pronotum coarsely, abundantly punctate; with seven elevated, conical tubercles, two on each side of anterior third, innermost more elevated, one centrally, and one on each side between the central one and lateral tubercle of prothorax; with wide, dense pale yellow pubescent band surrounding blackish lateral maculae, covering lateral tubercles, and part of lateral half close to lateral tubercles; remaining surface of sides mostly with yellowish-white pubescence with yellower pubescence interspersed; posterior 2/3 with abundant yellowish-brown pubescence partially obscuring integument, except blackish pubescence on areas with blackish integument; anterocentral third with both yellowish-brown and whitish pubescence close to anterior margin, except brownish pubescence and dark maculae, and remaining surface with dark yellowish-brown pubescence not obscuring integument. Sides of prothorax coarsely, somewhat abundantly punctate; with dense pale yellow pubescence centrally close to pronotum, abundant whitish pubescence not obscuring integument anteriorly and central area close to prosternum, dark pubescence not obscuring integument on blackish posterior area, and dense yellowish-brown pubescence on remaining posterior area. Prosternum with somewhat thick, abundant, pale yellow pubescence not obscuring integument laterally, shorter and distinctly sparser on remaining surface. Prosternal process with short, somewhat sparse, scale-shaped, pale yellow pubescence centrally, almost glabrous on remaining surface; narrowest area 0.27 times procoxal width. Sides of mesoventrite, with abundant yellowish-brown pubescence, gradually sparser toward glabrous central area, with whitish pubescence interspersed; mesanepisternum with pubescence as on sides of mesoventrite, but with spots with sparse brownish pubescence interspersed; mesepimeron with dense yellowish-brown pubescence close to elytra, gradually whitish, less dense toward mesocoxal cavity. Metanepisternum with dense yellowish-brown pubescence, more yellowish white on area between middle and posterior quarter, with spots with sparse brownish pubescence interspersed. Metaventrite with abundant yellowish-white pubescence, obscuring integument on some areas, and spots with sparse brownish pubescence interspersed. Scutellum with abundant, ochraceous pubescence almost obscuring integument, except dense, small yellowish brown pubescent macula on each side of base, and sparse dark pubescence on dark areas. Elytra. Parallel-sided on anterior 2/3, distinctly narrowed toward apex on posterior third; apex rounded; coarsely, somewhat sparsely punctate; with distinct row of three tubercles forming centrobasal crest, and somewhat abundant, both moderately large and small tubercles throughout, part of them longitudinally aligned; pubescence on centrobasal crest and nearly all large tubercles fine and yellowish-brown; area between scutellum and centrobasal crest and close to outer side of centrobasal crest mostly yellowish-white; pubescence on some large tubercles sparse and darkened; blackish inverted comma-shaped area with sparse scale-shaped yellowish-brown pubescence, absent on some areas; with irregular, wide, transverse, dense yellowish-white pubescent band after middle, from epipleural margin to suture, oblique close to suture; remaining surface between base and transverse yellowish-white pubescent band with abundant, scale-shaped, both yellowish-white and yellowish-brown pubescence not obscuring integument; area between transverse yellowishwhite pubescent band and apex mostly with scale-shaped yellowish-white pubescence not obscuring integument, except yellowish-brown pubescence close to transverse pubescent band. Legs. Femora with dense, thick yellowishwhite pubescence obscuring integument, except large brownish pubescence on wide area with brownish integument on dorsal base of femoral club and spots with brownish integument; with a short, decumbent, thick yellowish seta on each brownish spot of ventral surface. Tibiae with dense, thick yellowish-white pubescence, except bristly yellowish-brown pubescence on posterior third of ventral surface of protibiae, and somewhat sparse brownish pubescence on dark areas of all tibiae. Protarsomere I slightly shorter than II–III together; apex of dorsal surface of tarsomeres I–II with a few short, scale-shaped yellow setae, and center of dorsal surface of tarsomeres III with two scale-shaped yellow setae.

Abdomen. Ventrites 1–4 with abundant, scale-shaped yellowish-white pubescence, with abundant glabrous spots interspersed, except glabrous narrow apical area; ventrite 5 with abundant yellowish-white pubescence, almost absent on apical quarter, base, and anterocentral third; apex of ventrite 5 truncate, centrally emarginate.

Dimensions in mm. Total length, 6.35; prothoracic length, 1.10; anterior prothoracic width, 1.30; posterior prothoracic width, 1.60; maximum prothoracic width, 1.80; humeral width, 2.80; elytral length, 4.70.

Type material. Holotype female from PANAMA, Bocas del Toro: Palo Seco Forest , 8.785ºN 82.214ºW, 6.IX.2021, E. G. Riley leg. ( TAMU).

Etymology. Named for the country of Panama where the type was collected.

Remarks. Leptostylus panamensis sp. nov. is similar to L. notaticollis Bates, 1880 (see photographs on Bezark 2022), but differs as follows: elytra about 4.3 times prothoracic length; scape not projected on apex of ventral surface; antennomere III distinctly longer than basal prothoracic width; and yellowish-white pubescent band on the posterior half of the elytra not oblique laterally. In L. notaticollis , elytra about 3.55 times prothoracic length, scape projected on apex of ventral surface, antennomere III about as long as basal prothoracic width, and yellowish-white pubescent band on the posterior half of the elytra oblique from sides to suture. We don’t know the sex of the holotype of L. notaticollis . However, apparently it is a male and, if so, the antennomeres III and IV should be proportionally longer if it was the male of Leptostylus panamensis sp. nov., which is not the case. The female illustrated in Maes et al. (2010) as being L. notaticollis , apparently, is not of that species, although the general appearance is very similar. This is because the body appears to be slender and the prothorax proportionally smaller than in the holotype. These differences do not occur in other species of the genus (see, for example, L. retrorsus Bates, 1885 on Bezark 2022), and also in species of Leptostylopsis Dillon, 1956 . The new species differs from L. obliquatus Bates, 1880 (see photographs on Bezark 2022) especially by the absence of a dark band on the sides of the elytra (present in L. obliquatus ), and a yellowish-white pubescent band on the posterior half of the elytra not oblique laterally (oblique from sides to suture in L. obliquatus ); it differs from L. phrissominus Bates, 1885 (see photographs on Bezark 2022) especially by the apex of the scape and tibiae not blackish (blackish in L. phrissominus ), apex of the scape not projected ventrally (projected in L. phrissominus ), antennomeres III and IV proportionally longer (proportionally shorter in L. phrissominus ), and yellowish-white pubescent band on the posterior half of the elytra not oblique laterally (oblique from sides to suture in L. phrissominus ); L. panamensis sp. nov. also differs from L. laevicauda chiriquinus Bates, 1885 , especially by the antennomeres III and IV proportionally longer (shorter in L. laevicauda chiriquinus ).

Figures

FIGURES 5–8. Leptostylus panamensis, holotype female: 5) Dorsal habitus; 6) Ventral habitus; 7) Lateral habitus; 8) Head, frontal view.