Rosalba venusta, 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 : 96-98

Rosalba venusta sp. nov.

( Figures 9–12 )

Description. Male. Integument mostly dark brown, almost black; mouthparts reddish- brown; distal area of postclypeus, anteclypeus and labrum reddish brown; antennomeres IV–XI with narrow reddish-brown basal ring; prosternal process, postcoxal process, mesoventral process, and narrow anterior area of metaventral process dark reddish- brown; central area of scutellum reddish-brown; basal half of elytra with large, elongate, irregular reddishbrown area dorsally, gradually darkened toward its apex, and another small reddish-brown area dorsally close to anterior margin between humerus and scutellum; posterior quarter of elytra yellowish, except transverse, irregular brownish area not reaching suture and epipleural margin; trochanters, narrow basal area of femora, and narrow apical area of meso- and metafemora reddish-brown; basal third of meso- and metatibiae reddish-brown. Yellow pubescence more golden depending on light intensity.

Head. Frons finely, moderately abundantly punctate; with abundant pubescence not obscuring integument, yellowish-white close to clypeus, gradually yellowish-brown toward area between eyes, then sparser, brownish on V-shaped central area between eyes and antennal tubercles; with a few long, erect dark setae laterally. Vertex and area behind eyes finely, moderately abundantly punctate (punctures coarser, denser behind lower eye lobes); area between antennal tubercles nearly glabrous centrally, with brownish pubescence laterally, with moderately abundant yellow setae interspersed; remaining surface of vertex with brownish pubescence not obscuring integument, except longitudinal yellow pubescent band centrally; area behind superior region of upper eye lobes with brownish pubescence not obscuring integument, and inferior area with dense yellow pubescence; area behind lower eye lobes with yellow pubescence not obscuring integument; with a few long, erect dark setae close to eye. Genae finely punctate, except smooth apex; with yellow pubescence toward posterior area, yellowish-white toward frons, both not obscuring integument, except glabrous apex. Antennal tubercles finely, abundantly punctate (punctures finer than on frons); with brownish pubescence not obscuring integument. Postclypeus with yellowish-white pubescence on wide central area, with long, erect dark setae interspersed, glabrous laterally. Labrum coplanar with anteclypeus at posterior half, inclined on anterior half; with long, moderately sparse yellowish setae directed forward. Distance between upper eye lobes 0.10 times length of scape; in frontal view, distance between lower eye lobes 0.67 times length of scape. Antenna 1.8 times elytral length, reaching elytral apex at base of antennomere IX. Scape coarsely, densely, somewhat rugose-punctate; with brown pubescence not obscuring integument, with long, erect, thick dark setae interspersed, more abundant ventrally. Pedicel and antennomeres with brown pubescence, with minute white setae interspersed from VII, except yellowish, sparse pubescence on light basal area of IV–XI; ventral surface of pedicel and antennomeres III–X with long, erect, thick dark setae ventrally, abundant on III, gradually sparser toward X. Antennal formula (ratio) based on length of antennomere III: scape = 1.03; pedicel = 0.28; IV = 1.05; V = 0.92; VI = 0.86; VII = 0.78; VIII = 0.75; IX = 0.67; X = 0.64; XI = 0.67.

Thorax. Prothorax wider than long; sides straight, slightly divergent from anterolateral angles to posterolateral angles. Pronotum, in side view, strongly sinuous dorsally; coarsely, abundantly punctate; with three yellow pubescent bands, one centrally, narrowest, longitudinal, less dense, another on each side, slightly oblique on anterior third, then narrowed and curved toward straight, wide, longitudinal posterior area; with white pubescence not obscuring integument on sides of anterior third, close to yellow band, centrally with small yellow macula; remaining surface with brown pubescence not obscuring integument. Sides of prothorax coarsely, abundantly punctate; with transverse, moderately sparse yellow pubescent band centrally, with white pubescence close to pronotum on ante- rior half, brownish, sparse on remaining surface. Prosternum and prosternal process, coarsely, sparsely punctate; with white pubescence not obscuring integument. Ventral surface of mesothorax with white pubescence, distinctly sparser and shorter on central area of metaventrite, except yellow pubescence on outer area of mesanepisternum and mesepimeron. Metanepisternum with dense yellow pubescence anteriorly and posteriorly, brownish, sparser centrally. Metaventrite coarsely, abundantly punctate laterally, sparser on anterocentral area, nearly smooth on posterocentral area; with white pubescence, denser on wide, oblique band from meso- to metacoxal cavities. Scutellum with dense yellow pubescence. Elytra. Parallel-sided at anterior 3/4, gradually narrowed toward oblique, truncate apex; outer and sutural posterior angles slightly projected; coarsely, abundantly punctate on basal half, gradually sparser toward apex; large light anterior area with yellow pubescence not obscuring integument, with white setae interspersed on its outer area; with inverted U-shaped pubescent band from anterior margin to large light anterior area; with irregular, oblique, wide pubescent maculae on anterior third, connected to large light anterior area, not reaching suture and scutellum; with narrow, arched band with sparse yellow and white pubescence dorsally, from large light anterior area to near posterior third; with small yellow pubescent spot dorsally about middle; with yellow pubescence on posterior light area, and yellowish-brown pubescence on brownish posterior area; remaining surface of elytra with brownish pubescence not obscuring integument. Legs. Femora with white pubescence not obscuring integument, sparser, shorter on metafemora. Tibiae with brown pubescence not obscuring integument, bristly dorsally on mesofemora; with long, erect dark setae interspersed, more abundant in meso- and metatibiae.

Abdomen. Ventrites with abundant whitish pubescence not obscuring integument. Apex of ventrite V truncate.

Dimensions (mm). Total length, 5.40; prothoracic length, 0.90; anterior prothoracic width, 0.95; posterior prothoracic width, 1.05; humeral width, 1.60; elytral length, 3.80.

Type material. Holotype male from ECUADOR, Napo: Napo-Galeras road, km 1-2, 17.II.2004, F. T. Hovore col. ( LGBC, deposited at CASC).

Remarks. Rosalba venusta sp. nov. is similar to R. gaianii Joly, 2018 , but differs as follows: general integument color darker; the antennomeres are reddish-brown on the narrow basal area; elytral pubescence distinctly less conspicuous outside of light areas; lower eye lobes about as long as gena. In R. gaianii , the general color of the integument is brown, the antennomeres are reddish-brown, except on the dark narrow distal area, the elytral pubescence is noticeably conspicuous throughout, and the lower eye lobes are distinctly longer than the gena.

Etymology. Rosalba venusta is a graceful-appearing species and the species name reflects this appearance.

Figures

FIGURES 9–12. Rosalba venusta, holotype male: 9) Dorsal habitus; 10) Ventral habitus; 11) Lateral habitus; 12) Head, frontal view.