Pactola convexa (Montrouzier, 1860)

Mazur, Miłosz A., 2014, Review of the New Caledonian species of the genus Pactola Pascoe, 1876 (Coleoptera: Curculionidae: Eugnomini), with description of two new species, Zootaxa 3814 (2), pp. 202-220 : 209-211

Pactola convexa (Montrouzier, 1860)

(Figs.: 4a,b, 8, 12, 14c, 15c, 16c, 19a–c, 23a–c, 27)

Macropoda convexa Montrouzier, 1860: 878 (320); Klima, 1934: 82

Diagnosis. Elytron distinctly constricted at apical half. Last tarsal segments on hind legs very short, only slightly longer than tarsite 3. Tegmen with fused basal part of parameres, parameroid lobes partly sclerotised with membranous apex. Apex of spiculum gastrale simple, arrow-shaped.

Redescription. Body colour and vestiture (figs. 4a,b). Integument brown; covered with oval scales. Ventral part of rostrum shining, with only elongate, bright hair-like scales. Antennal scape and funicle brighter than rostrum, yellow-orange, funicle little darker than scape; club darker than funicle, covered with elongate, dense, recumbent setae. Pronotal disc with regularly distributed, suboval, bright scales and well visible, sparse, scaliferous punctures; anterior margin with line of protruding, elongate scales. Elytral disc with irregular, variable spots composed of darker scales, especially on posterior half; pair of distinctive darker spots on third intervals at midlength. Brighter scales forming oblique stripe behind midlength, reaching to lateral margin of elytral disc; lateral margin of elytral disc with scales brighter than on dorsal part. Each interval with row of elongate scales, inclined backwards (clearly visible only from lateral view); colour of scales variable, from pale to almost black. Femora covered with dense scales, the same as on dorsal part of body. Tibiae slightly brighter than femora, covered with mixture of single, recumbent, suboval scales and elongate, protruding scales.

Head (figs. 12, 14c, 15c). Head transverse (hw/hl = 1.25–1.38); temples as long as eyes; forehead narrower than base of rostrum. Rostrum slightly shorter than head, as long as maximum width; slightly curved. Scrobes short, straight, not reaching the margin of eyes. Apex of rostrum glabrous, shining. Eyes as long as half length of head, convex, distinctly protruding beyond margin of head. Scape of antennae longer than funicle, reaching hind margin of eyes; segment of funicle 1 elongate, as long as next three taken together; 2 longer than 3; next three shorter than wide; 6 subquadrate; 7 wider than long, broadened apically. Club elongate, 2.70–2.80 × as long as wide, longer than six last segments of funicle; with visible sutures.

Pronotum (figs. 8, 12). Subquadrate (bpw/pl = 1.08–1.15); constricted before rounded anterior margin and before base (fig. 8); surface with sparse, scaliferous punctures; space between punctures with microsculpture.

Elytra (figs. 8, 12). Elongate, parallel at anterior half; elytra (dorsal view) 1.38–1.64 × as long as maximum width at middle. Apex rounded. Anterior part of interstriae 2–4 distinctly convex, surface behind them depressed (well visible only from lateral view). Humeral calli present, well visible. Striae with well visible, deep, isolated punctures. Interstriae 3 at base and midlength more convex than other. Scutellum about 1.2 × as long as wide; covered with dense, similar as on pronotal disc, scales.