Rosalba contracta, Bezark & Santos-Silva, 2019

Bezark, Larry G. & Santos-Silva, Antonio, 2019, Synonymies and seven new species in Lamiinae from the Neotropical Region (Coleoptera, Cerambycidae), Zootaxa 4648 (1), pp. 92-110 : 94-96

Rosalba contracta sp. nov.

( Figures 2–8 )

Description. Male ( Figs. 2–6 ). Head dark brown dorsally, dark reddish-brown ventrally; mouthparts reddish-brown; scape and pedicel dark brown; antennomeres with light basal ring, reddish-brown on basal segments, gradually yellowish-brown toward distal segments; ventral surface of pro- and mesothorax dark brown, with some areas more reddish-brown; ventral surface of metathorax black, except reddish-brown area close to metacoxae; basal third of elytra dark reddish-brown (darker depending on light intensity), black on remaining surface; femora reddish-brown basally on narrow distal area, dark brown on remaining surface; protibiae reddish-brown on basal half, dark brown on distal half; meso- and metatibiae reddish-brown on basal third, dark brown on distal 2/3; tarsomeres I–IV reddish-brown, with irregular dark brown areas interspersed; tarsomere V reddish-brown on basal half, gradually dark brown toward apex; abdominal ventrites dark brown, with irregular reddish-brown areas interspersed.

Head. Frons finely, moderately abundantly punctate; with abundant yellowish-white pubescence, not obscuring integument; with a few long, erect dark setae close to eyes. Area between antennal tubercles and middle of upper eye lobes smooth, glabrous centrally, finely punctate, with yellowish-brown pubescence laterally; remaining surface of vertex and area behind eyes finely, moderately abundantly punctate, with yellowish-brown pubescence partially obscuring integument, except area close to prothorax with pubescence sparser; with a few long, erect dark setae close to eyes. Genae finely, sparsely punctate except smooth apex; with abundant yellowish-brown pubescence toward posterior area, yellowish-white, sparser toward frons; with a few long, erect dark setae. Antennal tubercles with yellowish-white pubescence frontally, yellowish-brown toward posterior area. Gulamentum smooth, glabrous on wide posterior area, depressed, with a few short yellowish-white setae anteriorly. Postclypeus with yellowishwhite pubescence not obscuring integument, with long, erect dark setae interspersed. Labrum with moderately long, sparse yellowish-white setae directed forward. Distance between upper eye lobes 0.07 times length of scape; in frontal view, distance between lower eye lobes 0.60 times length of scape. Antennae 1.8 times elytral length, reaching elytral apex at distal quarter of antennomere VIII. Scape coarsely, densely punctate; with yellowish-white pubescence dorsally, yellowish-brown laterally and ventrally, both not obscuring integument; with long, erect dark setae on posterior half of ventral surface. Pedicel with sparse yellowish-brown pubescence; with long, erect dark setae ventrally. Antennomeres III–V with yellowish-white pubescence on light area, not obscuring integument, yellowish-brown on dark area, not obscuring integument. Remaining antennomeres with yellowish-white pubescence throughout, shorter on dark area. Antennomeres with long, erect, sparse yellowish setae dorsally (also ventrally on XI); antennomeres III–X with long, erect dark setae ventrally. Antennal formula (ratio) based on length of antennomere III: scape = 1.12; pedicel = 0.25; IV = 1.19; V = 1.06; VI = 1.00; VII = 0.97; VIII = 0.90; IX = 0.81; X = 0.75; XI = 0.78.

Thorax. Prothorax slightly wider than long; sides rounded centrally. Pronotum coarsely, densely punctate; with yellowish-brown pubescence partially obscuring integument, sparser on central cross-shaped area, except nearly glabrous narrow anterior area. Sides of prothorax coarsely, densely punctate; with yellowish-brown partially obscuring integument; with a few long, erect dark setae posteriorly. Sides of prosternum with moderately abundant yellowish-brown pubescence, yellowish-white, sparse centrally (slightly denser on posterior half of prosternal process). Ventral surface of mesothorax with dense yellowish-brown pubescence laterally, distinctly sparser, yellowish-white toward central area (more abundant on posterior half of mesoventral process). Superior area of metanepisternum and sides of metaventrite with dense yellowish-brown pubescence, followed by area with abundant white pubescence, shorter, brownish with white setae interspersed on posterior half; anterocentral half of metaventrite with white pubescence not obscuring integument, distinctly sparser on posterior half, except area close to metacoxal cavities with denser yellowish-white pubescence; sides of metaventrite coarsely, moderately abundantly punctate; anterocentral area of metaventrite coarsely, moderately sparsely punctate, and posterior half smooth. Scutellum with dense yellowish-white pubescence. Elytra. Parallel-sided from humeri to about middle, then gradually narrowed toward apex; apex with outer angle projected as acute triangle, narrowly, strongly oblique toward rounded sutural angle ( Fig. 6 ); coarsely, moderately abundantly punctate on basal third, gradually finer, sparser toward apex; basal quarter with abundant yellowish-brown pubescence, with white setae interspersed on its distal area, except wide nearly V-shaped central area with distinctly sparser, shorter brownish pubescence; remaining surface with short, slightly conspicuous brownish pubescence, with a few short, yellowish and whitish decumbent setae interspersed, except narrow yellowish-white pubescent band laterally on posterior half, not reaching apex, strongly curved in- ward on middle, not reaching suture (almost cordiform when considering both elytra). Legs. Femora with yellowish-brown pubescence, sparser on metafemora. Tibiae with moderately sparse yellowish-white setae on basal half, brownish on distal half; with long, erect dark setae, sparser on protibiae.

Abdomen. Ventrites with abundant yellowish-brown pubescence not obscuring integument (more yellowishwhite centrally on I–IV); apex of ventrite V truncate.

Female ( Figs. 7–8 ). Differs from male by the slightly shorter antennae (1.7 times elytral length, reaching elytral apex at distal third of antennomere IX). Elytral apex ( Fig. 7 ) wider from outer projection to sutural angle.

Dimensions (mm), holotype male/ paratype female. Total length, 5.55/5.70; prothoracic length, 1.05/1.00; anterior prothoracic width, 1.05/1.10; posterior prothoracic width, 1.05/1.10; maximum prothoracic width, 1.15/1.20; humeral width, 1.60/1.65; elytral length, 3.90/4.30.

Type material. Holotype male ( LGBC, deposited at CASC), paratype female ( LGBC) from ECUADOR, Orellana: 17 km E Loreto , 27.VIII.2004, F. T. Hovore col.

Remarks. Rosalba contracta sp. nov. is similar to R. bicolor ( Audureau, 2016) (see photograph of the holotype at Bezark 2019), but differs by the distal area of the elytra uniformly narrowed toward the apex of the outer angle (sinuous in R. bicolor ), and by the outer angle not being curved sideward (curved in R. bicolor ). Rosalba bicolor also has a wider and lighter basal area of the elytra, but we believe this feature may be variable in both species.

Etymology. The specific epithet contracta refers to the narrowed apices of the elytra.

Figures

FIGURES 1–8. 1) Rosalba apiculata, female, dorsal habitus. 2–6) Rosalba contracta, holotype male: 2) Dorsal habitus; 3) Ventral habitus; 4) Lateral habitus; 5) Head, frontal view; 6) Elytral apex. 7–8) Rosalba contracta, paratype female: 7) Elytral apex; 8) Dorsal habitus.