Rosalba dalensi 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 : 226-227

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

( Figs 93–96 )

Description. Male. Integument mostly black; mouthparts and gular area light reddish-brown; parts of legs dark reddish-brown.

Head. Frons finely, abundantly punctate; with pale yellow pubescence partially obscuring integument; with some long, erect, dark setae close to eyes. Area between antennal tubercles with sculpture as on frons, except smooth narrow area close to median longitudinal groove; with yellow pubescence partially obscuring integument, except glabrous narrow area close to median longitudinal groove. Area between upper eye lobes with yellow pubescence obscuring integument, connected to pubescent area behind eye, glabrous on narrow area close to median longitudinal groove. Remaining surface of vertex and area behind upper eye lobes with sculpture as on frons, except area closer to prothoracic margin with finer, sparser punctures; with yellow pubescence partially obscuring integument, except glabrous area along median longitudinal groove and narrow area closer to prothoracic margin; with some long, erect, dark setae close to eyes. Median longitudinal groove distinct only due glabrous area from frons to at about after eyes. Area behind lower eye lobes tumid, finely punctate close to eye, minutely punctate toward prothorax; with yellow pubescence obscuring integument on tumid area, glabrous toward prothorax; with some long, erect, dark setae close to eye. Antennal tubercles finely, moderately abundantly punctate, becoming smooth toward apex; with pale yellow pubescence partially obscuring integument. Area between antennal socket and eyes with pale yellow pubescence, obscuring integument on some areas. Submentum subsmooth, nearly glabrous. Postclypeus with sculpture and pubescence as on frons on wide central area, smooth laterally; with long, erect, dark setae on sides of punctate area. Labrum convex and coplanar with anteclypeus on basal 3/4, inclined on distal quarter; with yellow pubescence, not obscuring integument, interspersed with long, erect yellow and dark setae; with fringe of golden setae on distal margin. Distance between upper eye lobes 0.1 times length of scape; in frontal view, distance between lower eye lobes 0.5 times length of scape. Antennae (missing antennomeres X–XI in the right antenna, and IX–XI in the left antenna) 1.6 times elytral length, reaching elytral apex at distal third of antennomere VIII; scape with pale yellow pubescence not obscuring integument, interspersed with long, erect, dark setae throughout; pedicel and antennomeres III–IX with long, erect, dark setae ventrally (sparser toward IX); antennal formula (ratio) based on antennomere III: scape = 1.27; pedicel = 0.25; IV = 1.36; V = 1.17; VI = 1.20; VII = 0.98; VIII = 0.98; IX = 0.92.

Thorax. Prothorax 1.05 times wider than long; sides widened centrally, unarmed. Pronotum with one slightly distinct gibbosity on each side of anterior third; moderately finely, abundantly punctate; with three longitudinal bands of yellow pubescence, central most wider, less distinct basally; area between yellow bands with white pubescence not obscuring integument; with sparse, long, erect dark setae. Sides of prothorax with sculpture as on pronotum; area closer to pronotum with wide band with white pubescence partially obscuring integument, and area closer to prosternum with wide band with yellow pubescence obscuring integument. Prosternum moderately finely, sparsely punctate; with yellowish white pubescence, denser laterally. Prosternal process moderately finely, abundantly punctate; with yellowish white pubescence partially obscuring integument. Mesoventrite with sparse yellowish white centrally, denser laterally. Mesanepisternum with yellowish white pubescence toward mesoventrite, with yellow pubescence close to elytra. Mesepimeron with yellow pubescence. Metanepisternum with yellowish white pubescence. Metaventrite with narrow band of yellow pubescence close to metanepisternum, with yellowish white pubescence on remaining surface. Scutellum with yellow pubescence interspersed with yellowish white pubescence partially obscuring integument. Elytra. Moderately coarsely and abundantly punctate on basal half, smooth on distal half. Pubescence as follows: transverse, irregular band of yellow pubescence after midlength, from lateral margin to suture (distal margin widely projected near suture); four longitudinal rows with yellow pubescence from base to transverse yellow band (innermost almost absent on basal fifth); longitudinal band with yellow and yellowish white pubescence along suture, from scutellum to at about apex of basal quarter; distal fifth with yellow pubescence (anterior margin irregular), except on irregular central area with sparser pubescence exposing integument; with narrow band of yellow pubescence along suture, from transverse yellow band to distal yellow area; remaining surface between base and transverse yellow band with yellowish white pubescence exposing integument (distinctly sparser on discal basal fifth, between second longitudinal yellow band ant suture); remaining surface between transverse yellow and distal yellow area with brown pubescence distinctly exposing integument; apex slightly obliquely truncate, with outer angle slightly triangularly projected. Legs. Femora with yellowish white pubescent not obscuring integument. Metatarsomere I 0.75 times II–III together; metatarsomere V (without claws) as long as I–III together.

Abdomen.Ventrites laterally with moderately wide band of pale yellow pubescence partially obscuring integument; remaining surface with yellowish white pubescence partially obscuring integument (sparser than laterally); with long, erect, sparse dark setae; apex of ventrite V truncate, centrally slightly emarginate.

Dimensions in mm (holotype male/ paratype males/ paratype female). Total length, 6.10/5.90–6.90/7.20; prothorax: length, 1.10/1.05–1.25/1.35; anterior width, 1.15/1.10–1.25/1.30; posterior width, 1.10/1.15–1.30/1.30; widest prothoracic width, 1.20/1.20–1.40/1.35; humeral width, 1.60/1.65–1.85/2.00; elytral length, 4.25/4.10–4.80/ 4.85. Only one paratype female was measured.

Type material. Holotype male from FRENCH GUIANA: Montagne des Chevaux ( Roura ; automatic light trap), 04.I.2014, Dalens col. ( MNHN, former PHDC). Paratypes—FRENCH GUIANA: Montagne des Chevaux ( Roura ), 1 male (ex larva), 07.IV.2010, Dalens col. ( PHDC); 1 female (ex larva), 09.VI.2010, Dalens col. ( PHDC); 1 male (automatic light trap), 07.XII.2013, Dalens col. ( PHDC); 1 male (automatic light trap), 05.VII.2014, Dalens col. ( PHDC); Montagne Pelée (Saül), 1 male, 11.I.2011, Dalens col. ( PHDC); 1 female, 11.I.2011, Dalens col. ( PHDC); 1 male (Malaise trap), 20.V.2011, Dalens col. ( PHDC); RN2 PK 125 piste Kapiri (interception trap), 1 specimen (unknown sex), 19.XII.2008, Giuglaris col. ( JLGC).

Etymology. The new species is named for Pierre-Henri Dalens (PHDC), collector of the holotype.

Remarks. RΟsalba dalensi sp. nov. resembles R. senecauxi , also from French Guiana, but differs as follows: elytra with transverse band after midlength, fused with distal yellow area only through sutural band; metanepisternum with yellowish white pubescence. In R. senecauxi , the elytra have oblique, very irregular band after midlength (often fragmented), at least partially fused with distal yellow area for more than on narrow band, metanepisternum with yellow pubescence.

Figures

FIGURES90–96. Dorsalhabitus:90, Rosalbasenecauxi sp.nov., holotype male; 91, Rosalba clinei sp.nov., paratype female; 92, R. stenodesma, holotype male. 93–96, R. dalensi, holotypemale: 93, dorsal habitus; 94, ventral habitus; 95, lateral habitus; 96, head, frontal view.