Rosalba giesberti Santos-Silva & Galileo, 2018

Santos-Silva, Antonio, Galileo, Maria Helena M., Joly, Luis J. & Tavakilian, Gérard L., 2018, The genus Rosalba Thomson, 1864 (Coleoptera, Cerambycidae, Lamiinae, Apomecynini), Zootaxa 4387 (2), pp. 201-258 : 205-206

Rosalba giesberti Santos-Silva & Galileo , sp. nov.

( Figs. 5–8 )

Description. Male. Integument dark brown, black on some regions, mainly head and pronotum; mouthparts mostly brown, yellowish brown on some areas; gula reddish brown; base of meso- and metafemora dark reddish brown, mainly ventrally; base of tibiae slightly lighter than remaining surface.

Head. Frons finely, abundantly punctate; with white pubescence obscuring nearly all integument; with one long, erect, brown seta on each side close to eyes. Area between antennal tubercles finely, abundantly punctate; with white pubescence obscuring part of integument, more yellowish close to upper eye lobes. Area between upper eye lobes with yellow pubescence obscuring integument, connected to narrow band also with yellow pubescence behind and close to upper eye lobes. Remaining surface of vertex finely, abundantly punctate; with sparse, yellow pubescence along median longitudinal groove, distinctly shorter, finer, yellowish, not obscuring integument on each side of yellow central pubescence. Antennal tubercles finely, abundantly punctate; with white pubescence interspersed with yellow pubescence toward upper eye lobes. Area between antennal socket and eyes with yellow pubescence obscuring integument. Area behind upper eye lobes with sculpture and pubescence as on sides of vertex, except yellow band of pubescence close to eye. Area behind lower eye lobes with yellow pubescence obscuring all exposed surface of integument. Area on each side of gula finely, rugose-punctate. Submentum narrow, depressed, finely, transversely striate close to gula, smooth toward elevate region; with short, sparse, yellowish setae interspersed with long, erect, sparse, brown setae. Postclypeus with white pubescence obscuring distal region of integument, interspersed with long, erect, brown setae. Labrum convex and coplanar with anteclypeus on basal half, inclined on distal half; pubescence slightly conspicuous on area close to anteclypeus, moderately long, abundant, yellowish on inclined area; with transverse row with long, erect, thick, brown setae on distal margin of coplanar area. Distance between upper eye lobes 0.07 times length of scape; in frontal view, distance between lower eye lobes 0.52 times length of scape. Antennae 2.0 times elytral length, reaching elytral apex at basal fifth of antennomere VIII; ventral side of scape and antennomere III with sparse, yellow setae; ventral side of scape, pedicel and antennomeres III–X with long, erect, dark setae, gradually sparser toward antennomere X; antennal formula (ratio) based on antennomere III: scape = 0.93; pedicel = 0.20; IV = 1.06; V = 0.95; VI = 0.89; VII = 0.84; VIII = 0.80; IX = 0.73; X = 0.65; XI = 0.75.

Thorax. Prothorax 1.10 times wider than long; sides rounded about middle. Pronotum coarsely, abundantly punctate except on narrow, smooth, transverse band close to basal and distal margin; with three wide, longitudinal bands with dense, yellow pubescence obscuring integument (one centrally, narrowed between apex of basal quarter and middle; one on each side); remaining surface with short, decumbent, yellowish white pubescence distinctly exposing integument; on base and apex with narrow band with white pubescence. Sides of prothorax with sculpture as on pronotum, coarser close to procoxal cavity; with transverse, wide band with yellow pubescence obscuring integument placed at about middle; on each side of yellow band with short, decumbent, white pubescence not obscuring integument; with long, erect, sparse, brown setae. Prosternum finely, moderately sparsely punctate; with sub-erect, abundant, yellowish white setae. Prosternal process coarsely, densely punctate; with sub-erect, abundant, yellowish white setae not obscuring integument, distally distinctly denser, more erect interspersed with brown and yellow setae. Mesoventrite notably transversely depressed close to apex of prosternal process; laterally with decumbent, abundant white pubescence obscuring integument; with slightly conspicuous, yellowish white pubescence on depressed area. Mesanepisternum with dense, yellow pubescence obscuring integument, except superior inner side with whitish pubescence distinctly not obscuring integument. Mesepimeron with yellow pubescence obscuring integument throughout. Metanepisternum with longitudinal band with dense, yellow pubescence close to metaventrite, with white pubescence toward elytron. Metaventrite with narrow band with dense, yellow pubescence close to metepisterna, with longitudinal band with moderately dense yellow pubescence (distinctly less conspicuous than laterally), from mesocoxal cavities to distal third (narrowed from its base to apex); remaining surface with white pubescence, partially obscuring integument (mainly centrally). Scutellum with dense, yellow pubescence. Elytra. Coarsely, abundantly punctate on basal third, gradually finer, sparser toward apex. With dense, yellow pubescence as follows: moderately narrow, longitudinal band on vertical area, from humerus to after middle; wide band dorsally from base to near distal third, not reaching suture, interspersed with three elongate areas with slightly conspicuous yellowish brown pubescence (one, shortest, at about center of basal fifth; one, longest, from apex of basal fifth to middle, placed more laterally than the former; one opened posteriorly, starting at about middle of the longest); on distal fifth except obliquely band with slightly conspicuous yellowish brown pubescence from sides to middle (anterior margin of this yellow area with projections forward, connected with anterior yellow macula by narrow band close to suture). With sutural band with yellow pubescence, gradually, narrowed, more whitish toward apex after basal fifth. Remaining elytral surface with slightly conspicuous, yellowish brown pubescence. Elytral apex obliquely truncate, with outer angle projected in short spine and sutural angle rounded. Legs. Femora dorsally with yellow pubescence; ventral side of profemora with longitudinal band with yellow pubescence; remaining surface of femora with white pubescence. Metatarsomere I as long as 0.7 times II–III together; metatarsomere V (without claws) as long as 0.9 times I–III together.

Abdomen. Ventrites laterally with yellow pubescence, white on remaining surface. Ventrites IV–V with long, erect, brown setae, more abundant on distal third of V; apex of ventrite V truncate at apex (slightly emarginate centrally).

Dimensions in mm (holotype female). Total length, 6.50; prothorax: length, 1.20; anterior width, 1.15; posterior width, 1.25; widest prothoracic width, 1.30; humeral width, 1.80; elytral length, 4.60.

Type material. Holotype female from BOLIVIA, Santa Cruz: Buena Vista , 18-25.X.1992, E. Giesbert col.( MNKM).

Etymology. This species is named for the late Edmund F. Giesbert, an early explorer of the Bolivian cerambycid fauna and collector of the only known specimen.

Remarks. RΟsalba giesberti sp. nov. is similar to R. skillmani sp. nov., but differs mainly by the elytral pattern of pubescence, and by the absence of a distinct second longitudinal band on inclined area of metaventrite (present in R. skillmani ).

Figures

FIGURES 1–7. 1–4, Rosalba wappesi sp. nov., holotype female: 1, dorsal habitus; 2, ventral habitus; 3, lateral habitus; 4, head, frontal view.5–7, Rosalba giesberti sp. nov., holotype female: 5, dorsal habitus; 6, ventral habitus; 7, head, frontal view.

FIGURES 8–14. 8, Rosalba giesberti sp. nov., holotype male, lateral habitus. 9–12, Rosalba skillmani sp. nov., holotype female: 9, dorsal habitus; 10, lateral habitus; 11, ventral habitus; 12, head, frontal view. 13–14, Rosalba senecauxi sp. nov., paratype female:13, dorsal habitus; 14, head, frontalview.