Pachyrhynchus disargus, Rukmane, 2019

Rukmane, Anita, 2019, Four new species and two subspecies of the genus Pachyrhynchus Germar, 1824 (Coleoptera: Curculionidae: Pachyrhynchini) from Luzon Island, Philippines, Baltic Journal of Coleopterology 19 (2), pp. 141-150 : 146-147

Pachyrhynchus disargus sp. nov.

Fig. 2 , 4 A-B.

Type material. Holotype. Male. ‘’ PHILIPPINES / Luzon, Nueva Vizcaya, Kasibu / V. 2015 / local collector leg.’’ (white rectangular label, printed) ; ‘’ HOLOTYPE / Pachyrhynchus disargus / Rukmane, 2019 / det. Rukmane A. 2019’’ (red rectangular label, printed).

Integument black, body shiny, underside with weaker luster; body with markings of pale orange and blue round to recumbent scales. Dorsal and lateral habitus as shown in Fig. 2 A-B.

Rostrum longer than wide (LR/ WR 1.13), slight impression on apical ½, bulging on apical 2/2; triangular impression on basal part, shallow longitudinal groove from middle of rostrum to base of forehead; lateral parts covered with rare short white hairs, patch of scales on genae. Head glabrous, finely punctured; eyes small, slightly prominent from the outline of the head. Forehead slightly bulging, smooth, nearly 1,8 times as wide as eye width.

Prothorax subspherical, longer than wide ( LP / WP 1.15), widest just before the middle; weakly punctured; with the following markings: 1) two subtriangular patches of pale orange scales on dorso-lateral part near apical margin; subovate patch on each lateroventral part; in dorsal contour increased from apical margin, widest just before the middle, firmly rounded, then decreased to basal 1/3 where slightly incurved and increased to basal margin; subbasal groove strongly pronounced, subapical groove interrupted on disc.

Legs stout; coxa without scaly markings; femur without hairs, patch of scales on apical part; tibiae incurved apically, covered with sparse pubescence on all length and long light hairs along internal margin; tarsus with long, golden setae. Elytra sub ovate ( LE / WE 1.69), with weakly pronounced intervals, nearly smooth; each elytron with the following markings: 1) two subovate pale orange patches on basal part; 2) four pale blue subovate patches on medial; 3)two sutural patches, one just before midline, one close to apex; 4) three subovate patches on apical ½; 4) one triangular patch near apex laterally; widest just at the middle; on dorsal dimension narrow at the base, gradually increased to middle, widest just in the middle, then roundish and gradually decreased to apex; apex rounded, with weak pubescence.

Elytra wider than prothorax ( WE / WP 1.56), more than twice as long as prothorax ( LE / LP 2.29). Ventrites densely covered with blue to green round scales, minutely pubescent, mingled with few longer light color hairs. Genitalia as shown in Fig. 4 A-B.

Female. Unknown.

Differential analyses. P.disargus sp. nov. is similar on general appearance to P. argus Pascoe by its shape of pronotum and elytra, yet, it is easily distinguishable by the following features: 1) narrower pronotum, that is widest just before middle, increased at subbasal part; 2) unique markings on pronotum and elytra of P.disargus sp. nov..

Etymology. This species was named after it’s similarity to P. argus .

Figures

Fig. 2. A - Dorsal habitus of P.disargus sp. nov. male; B – Lateral habitus of P.disargus sp. nov. male Female. Unknown.

Fig. 4. A, C, H, J, L – aedeagus in lateral view; B, D, I, K, M – aedeagus in ventral view; A, B – P.disargus sp. nov.; C, D – P.congestus ssp. aedamlayroni subsp. nov.; H, I – P.kirklayroni sp. nov.; J, K – P.sagittatus sp. nov.; L, M – P.tetramaculatus sp.nov.; E, F, G – female genitalia of P.phaleratus ssp. dannylayroni subsp. nov.; E – sternite VIII in ventral view; F – ovipositor in dorsal view; G – spermatheca. Scale bar 1.00 mm