Rasilinus bicolor, Mazur, Milosz A., 2016

Mazur, Milosz A., 2016, A new genus and nine new species of Eugnomini (Coleoptera, Curculionidae) from New Caledonia, ZooKeys 554, pp. 87-118 : 92-94

Taxon classification Animalia Coleoptera Curculionidae

Rasilinus bicolor sp. n. Figs 1, 10, 19, 28, 37, 49-51, 77, 86, 89, 94, 100, 107, 114, 121, 126, 131

Diagnosis.

Distinguished by the bicolored body with pronotum and basal part of elytra reddish and remaining parts of body black. Pronotal disc with subtriangular mark composed of white scales. Humeral calli strongly prominent.

Description.

Body length (lb) 2.55-2.90 mm.

Body colour and vestiture (Fig. 1). Head and rostrum dark brown to black covered with white, suboval (adjoining) and elongate (protruding) scales. Scape orange, darkening to apex; funicle and club darker. Pronotum reddish with subtriangular spot composed of white scales. Elytra bicolored, anterior half reddish, posterior half dark brown to black; intervals with single, protruding, elongate, dark (lighter-colored at apical part) scales. Elytra medially with two small spots on third interval composed of white suboval scales (sometimes hardly visible). Legs dark brown; fore and middle femora with single, white, protruding scales, hind femora with transverse stripe of small, suboval, white scales. Front and middle tibiae with elongate, protruding scales, these are brown on basal part and white on apical two thirds. Tarsi orange.

Head, rostrum and antennae (Figs 19, 28, 37). Head capsule transverse (hw/hlca. 1.30). Forehead between eyes flat; eye protruding in dorsal view. Vertex distinctly convex, strongly rough. Eyes rounded, convex, slightly protruding beyond the head outline; longer than half length of head (eyl/hlca. 0.70). Rostrum weakly curved, much longer than wide at apex (rl/arwca. 1.60). Funicle shorter than scape; desmomere 1 elongate, as long as 2+3; 2 elongate, almost as long as 3+4; desmomeres 3-7 slightly longer than wide. Club elongate, ca. 2 × longer than wide, as long as last five desmomeres of funicle, compact.

Pronotum (Figs 10, 19). Campaniform with weakly rounded apical margin, basal margin slightly medially extended onto scutellum, widely rounded. Widest at base, bpw/plca. 1.20. Pronotal disc flat in lateral view, with fine depression near apex. Surface with dense punctation, rough; space between punctures matt.

Elytra (Figs 10, 19). Widest across humeral calli (el/mewca. 1.50); distinctly narrowed behind humerus, slightly broadened medially, strongly narrowed to apex. Dorsal surface glabrous, shining. Striae with subcircular, well isolated punctures, these becoming less numerous towards apex. Intervals flat, glabrous, with single line of short, protruding scales in two colours: brown on basal four fifths and white on apical fifth.

Legs (Figs 49-51). Front and middle legs robust; tibiae bisinuate, short and wide (ptbl/ptbmwca. 4.00); hind tibiae with arched inner margin, distinctly narrowed before apex. Femora with rough surface and distinct, transverse corrugation. Front and middle femora stout with small ventral tooth, surface between tooth and apex with semicircular, deep cavity. Base of hind femora distinctly compressed, slightly twisted. Corrugation on flattened, basal part of legs deeper and parallel horizontally. Claws toothed.

Abdomen (Fig. 86). Weakly narrowed, almost as long as maximal width at base. Suture between ventrites 1 and 2 depressed laterally; medially not depressed, only as thin line; sutures between ventrites 2-5 wide, strongly depressed. Last ventrite with widely rounded posterior margin; 2 × as wide as long. Entirely covered with deep punctation and piliform, white setae; surface glabrous, shining. Pygidium of male subquadrate, dorsal surface with sparse punctures. Ventral processes elongate with single, short setae.

Male terminalia (Figs 100, 107, 114). Tegminal apodeme short and narrowed. Pedon slightly, regularly tapering toward rounded apex; base fully sclerotized; in lateral view distinctly curved with upturned apex. Basal part of sternite VIII apodeme extended into pair of elongate, slightly curved and tapering processes; Sternite IX with two small, subtriangular sclerites situated at apical part of divided appendices. Tegmen with parameres fused over basal third of length, without intervening membrane.

Female (Figs 94, 121, 126, 131). Similar to male in measurements and proportion of body, but slightly larger. Subtriangular white mark on pronotum smaller; two white spots at the middle of elytra absent. Fore tibiae more slender than those of male; subapical part of femora less concave; tooth on fore and middle femora minute. Abdominal tergite VIII subcircular with small punctures at lateral margin; apically with elongate setae some of which are slightly broadened basally. Gonocoxite as in Fig. 121, elongate, slightly constricted medially. Spermatheca stout, short, weakly concave. Apodeme of sternite VIII long, base split into pair of short, acute processes; apical lobe irregular, furnished with elongate setae at anterior angle.

Measurements.

Holotype, ♂/paratype, ♀: apw 0.50/0.55; arw 0.25/0.30; bew 1.15/1.35; bpw 0.65/0.75; el 1.75/2.00; eyl 0.25/0.30; frw 0.15/0.15; hl 0.35/0.40; hw 0.25/0.30; lb 2.55/2.90; mew 1.15/1.35; mith 0.20/0.25; mpw 0.65/0.75; mth 0.30/0.35; pl 0.55/0.60; ptbl 0.60/0.70; ptbmw 0.15/0.15; rl 0.40/0.45; scl 0.55/0.55.

Type material.

Holotype, ♂ - 20°33'S / 164°48'E, 20-50 m., Cascade de Tao, humid forest along stream, 01.02. 2004, leg. M. Wanat (MNHN).

Paratypes: 1♀ - 20°23.9'S / 164°31.9'E, Mandjélia (summit), 12.01.2007, 750-780 m, beating, montane forest, leg. M. Wanat & R. Dobosz (MNHW); 1♀ - 20°33'S / 164°46'E, Mt. Panié, 500-1000 m, E track, humid forest, 03.02.2004, leg. M. Wanat (MNHW).

Etymology.

This specific epithet is derived from the Latin prefix bi– (two), and noun color (color, pigment) and refers to the bicolored body. A noun in apposition.

Distribution.

New Caledonia (main island, north province).