Metapocyrtus bacoensis, Sandel & Bollino, 2018

Sandel, Franco & Bollino, Maurizio, 2018, Four New Species of Metapocyrtus Heller, 1912, from Mindoro Island, Philippines (Coleoptera, Curculionidae, Entiminae, Pachyrhynchini), Baltic Journal of Coleopterology 18 (2), pp. 139-158 : 140-144

Metapocyrtus bacoensis sp. nov.

( Figs. 1 a-1d)

Diagnosis.

Metapocyrtus bacoensis is easily distinguishable from any other known Metapocyrtus species. The subovate elytra, with a uniformly convex profile, a pronounced dorsal hull-like expansion in the apical part, and large latero-ventral yellow and light blue bands, make this species unique and easily separable from all the others of the genus.

Type material. Holotype male “ Philippines - Mindoro Island / SW slopes mt. Iglit Baco / San Jose (Calintaan) / I.2016 - mt. 1200 / coll. Sandel ”, will be deposited in SMTD

Paratypes (31 males, 27 females): 10 males 14 females: Philippines - Mindoro / SW slopes Mt. Iglit Baco / San Jose ( Calintaan ) / I. 2016 - m 1200 / coll. Bollino ; 1 female: Philippines - Mindoro / Mt Halcon ( Baco ) / IV-VI.2013 / legit local people - coll. M. Bollino ; 2 males: Philippines - Mindoro / Puerto Galera / (Mindoro oriental) / IX-X.2016 / coll. Bollino ; 2 females: Philippines - Mindoro I. / Mt. Baco / XI.2017 / coll. Bollino , all in MBLI; 13 males, 6 females: Philippines - Mindoro Island / SW slopes mt. Iglit Baco / San Jose ( Calintaan ) / X.2015 - mt. 1200 / Coll. Sandel ; 4 males, 1 female: Philippines - Mindoro / SW slopes Mt. Iglit Baco / San Jose ( Calintaan ) / I. 2016 - m 1200 / coll. Sandel ; 1 male: Philippines - Mindoro / Mt. Halcon : 1300 Mt. / Coll. Data : III-IV.2013 / coll. Sandel; 2 males, 1 female: Philippines - Mindoro / Mt. Halcon / Coll. Data : III.2014 / coll. Franco Sandel; 1 male: Philippines - Mindoro / Puerto Galera / Coll. Data : IV.2016 / coll. Franco Sandel, all in CFS.

Description

Male. Dimensions: LB: 9.8 - 11.7 (holotype 10.8; â: 10.74). LR: 1.8 - 2.0 (1.9; â: 1.9). WR: 1.4 - 1.6 (1.5; â: 1.5). LP: 3.1 - 3.9 (3.5; â: 3.52). WP: 3.0 - 3.7 (3.4; â: 3.38). LE: 6.7 - 8.0 (7.5; â: 7.42). WE: 4.7 - 6.4 (5.5; â: 5.48).

N = 5 for all measurements.

Black integuments. Body with a glossy surface, except the ventral part which is more opaque. Body dorsally subglabrous; ventrally long tufts of yellowish adpressed hairs between the coxae of the pronotum and on ventrites I-III.

Rostrum slightly longer than wide (LR/WR 1,26), enlarged at the apex with scrobes visible from above; wrinkled and covered by rough spots, with deep basal transversal furrow, and with a longitudinal groove along the midline, interrupted approximately before the anterior quarter, and deeper and widened anteriorly. Sides of the rostrum more convex backward, from the base then gradually more flat up to anterior two thirds; dorsal contour slightly raised at the base, interrupted by the deep basal sulcus.

Head with very short light hairs in foveola; rostrum with short light blue hairs, ventral part with longer adpressed pale blue hairs, apex of the rostrum with hairs and long yellowish bristles. Behind each eye, one spot of light blue scales mixed with long pale blue hairs.

Flat forehead, wrinkled anteriorly, separated from the rostrum by a deep transverse groove, furrowed by a short longitudinal groove on the midline, starting from the transverse groove and towards the forehead, sometimes reaching the posterior edge of the eyes; sparse foveolae with bristles, coarser forward towards the transverse groove, almost vanishing behind the eyes; a slight sub-triangular depression with a rough base between the lateral back edge and the upper edge of the antennal sulcus, reaching the lower edge of the eye.

Eyes slightly protruding, with constant convexity.

Pronotum: subglobose, narrowed forward, as long as wide ( LP /WP 1), its dorsal contour widest and highest at the mid point. Dorsal surface with short bristles protruding from the shallow points, surface between the points finely wrinkled, without scales on the disc; anterior edge covered by light blue scales, the line being interrupted in the middle. On both sides a dorso-lateral spot of light blue scales extending from the anterior to the posterior edge, and a latero-ventral band of the same color just above coxae.

Elytra: subovate ( LE /WE 1,36), wider than the pronotum, ( WE /WP 1,62), with greater width about halfway, dorsal profile uniformly convex, apical part with a pronounced dorsal hull-like expansion, forming an angle of about 100° with the apex of the elytra. Disk dotted, elytral striae finely wrinkled, interstriae formed by aligned points with very short whitish bristles; apex with few yellowish hairs; in the ventral view sides dilated up to the mid point, and widest about at the same point, then narrowing and curving to the rounded apex. A wide lateral band extended from stria VII to the elytral margin, and from the anterior edge backward to the third apical portion, vanishing towards the apical part: the band is formed by orange scales in the most external part towards the epipleurae, then upward by sparse light blue scales; some scattered pale blue scales in the apical part of the elytra, between striae IV and VII.

Femora moderately club-shaped, with lightblue, hunched bristles, longer and thicker towards the distal part. Tibiae slightly curved at the apex, hind tibiae with more pronounced bending; covered with thick light blue bristles, which turn yellowish towards the apical part; inner edge serrate with a series of small teeth and fringe of yellowish color. Coxae with light blue h air s an d lon g yellowish br istles. Mesosternum hairless, only a tuft of yellowish bristles and light blue lateral hairs between the coxae. Metasternum completely covered with long, adpressed bristles, yellowish centrally and light blue laterally. Ventrite I with dense and long light orange bristles, laterally with sparse light blue bristles. Ventrite II with shorter and sparse light orange hairs in the center, and light blue laterally. Ventrites III-IV-V with sparse pale yellow and light blue bristles, ventrite V flat and with notable roughness on the disc.

Antennae: thin scape, slightly shorter than the funicle, first antennomere about 4 times longer than wide, almost 2 times longer than II; second antennomere about 2.3 times longer than wide, and 2 times longer than III; third antennomere about 1.2 times longer than wide; IV and V antennomeres almost as long as wide; VI antennomere about 0.8 times longer than wide, and VII about 1.4 times wider than long; clubs bulging, covered with thick yellowish pubescence, about 2.3 times longer than wide.

Genitalia as illustrated (figs 2a-2d; 9a)

Female. Dimensions: LB: 9.5 - 10.6 (â: 10.42). LR: 1.5 - 1.7 (â: 1.42). WR: 1.2 - 1.5 (â: 1.4). LP: 3.2 - 3.4 (â: 3.28). WP: 3.0 - 3.3 (â: 3.1). LE: 6.8 - 8.2 (â: 7.46). WE: 5.1 - 5.7 (â: 5.42).

N = 5 for all measurements.

Elytra more convex than in the male, apical third with much less pronounced careniform expansion. Lateral bands interrupted by two areas without scales, scattered light blue scales on apical third, between striae V and VII, and a few sparse long bristles between striae III and IV.

Pronotum with two small dorso-lateral spots formed by few light blue scales. Mesosternum and metasternum with tufts of hairs shorter than in the male, ventrite I strongly wrinkled crosswise, ventrite V with roughness crossgrain and longitudinal depression on both sides of the disc. Hind femora shorter than in the male. Other characters practically like in the male.

Genitalia as illustrated (figs 2e- 2g)

Distribution. The species is distributed along the whole mountain ridge that runs through the island from NW to SE

Etymology. The name is derived from that of Mount Baco, from where most material comes.

Figures

Fig. 1. a: Metapocyrtus bacoensis Holotype dorsal view; b: idem, lateral view, c: Metapocyrtus bacoensis female dorsal view; d: idem, lateral view