Metapocyrtus jaysoniensis, Rukmane-Bārbale, 2024

Metapocyrtus jaysoniensis sp. nov.

( Fig. 5C, D View Figure 5 ; 6C, D View Figure 6 ; 7A, D View Figure 7 )

Type material. Holotype, male ( Fig. 5C View Figure 5 ): PHILIPPINES / Luzon, Bicol, Albay, Tabaco , Mt. / Mayon Volcano / IX. 2022 / local collector leg. (white printed label) // HOLOTYPE / Metapocyrtus pseudojaysoni / Rukmane-Barbale, 2024 (typed on red card).

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Paratypes (2♀): 1♀ same data as holotype ; 1♀ PHILIPPINES / Luzon, Quezon, Gen Nakar / III. 2024 / local collector leg. The additional label: “ PARATYPE / Metapocyrtus pseudojaysoni / Rukmane-Barbale, 2024” (typed on red card) was added to both paratypes ( DUBC) .

Diagnosis. Metapocyrtus jaysoniensis sp. nov. is similar to Metapocyrtus jaysoni Bollino, 2023 ( Fig. 5A, B View Figure 5 ) by general scale pattern on prothorax. M. jaysoni Bollino, 2023 so far is known only from Quezon Province, while M. jaysoniensis sp. nov. is recorded both from Quezon and Bicol. The new species can be distinguished by the following characters: 1) distinct elytral and pronotal scales of green, yellow and orange colour in M. jaysoniensis sp. nov. instead of monotone sky-blue scale markings in M. jaysoni Bollino, 2023 ; 2) rostrum in dorsal contour with rounded ventro-lateral edges in M. jaysoniensis sp. nov. ( Fig. 6C, D View Figure 6 ), resulting in a smoother, more gradual contour on the underside; M. jaysoni Bollino, 2023 has sharp, non-rounded ventro-lateral edges, resulting in a more angular, defined appearance along the underside of the rostrum ( Fig. 6A, B View Figure 6 ). This can be linked to different functional or adaptive roles depending on the species ecological niche or feeding habits.

Description. Holotype. Male. Dimensions: LB: 11,4; LE: 7,3; LP: 3,8; WE: 5,1; WP: 4,3; LR: 2,0; WR: 1,8. N = 1.

Integument glossy black, underside with weak- er luster. Body subglabrous, with glossy yellow, green or orange scales. Rostrum with a moderate basal subtriangular patch of orange and green scales along midline, each side covered with few light hairs on lateral part in all length, moderate patch of green and orange elongated scales on genae.

Prothorax with the following yellow and green scales: 1) broad band of round scales along anterior groove, merging with a 2) lateral patch on the basal margin, which ascends

Four new species of Pachyrhynchini from Southern Luzon, Philippines ( Coleoptera , Curculionidae , Entiminae )

along approximately one-third of the posterior groove; 3) anterior band projects posteriorly as a sublateral band, constricting medially and markedly widening in the posterior region.

Each elytron with the following scale markings: 1) narrow, longitudinal band of blue scales along suture, from medial portion to apex; 2) wide longitudinal band of orange scales in all length, from interval III to medial portion; 3) narrow, longitudinal band of blue scales in all length along midline; 4) longitudinal band of range scales in all length along lateral margin. Each femur moderately covered with fine hairs, with band of green to yellow scales on subapical part. Tibiae covered with fine brown hairs along internal margin, with rare black setae.

Head minutely punctured; forehead flattish with moderate median furrow, starting from base of rostrum to exceeding posterior ocular edge; eyes slightly convex from outline of the head. Rostrum slightly longer than wide (LR/WR 1.11); transverse basal groove with sides curved downwards; dorsum moderately wrinkled, edges rounded, with deep median groove from base to middle of apical half, weakly bulging along medial part; dorsal contour of rostrum nearly straight, slightly widened at apex.

Antennal scape flattened, shorter than funicle; funicular segment I more than twice as long as wide, slightly longer than II; segment II twice as long as wide, twice as long as III; segments III– VII subequal in length, as long as wide; club sub ellipsoidal, 2.5 times as long as wide. Pronotum spherical, wider than long (WP/LP 1.13); dorsum minutely punctured, convex, with shallow medial longitudinal groove; dorsal contour widest at middle; lateral contour widest at middle; apical and basal margin subtruncate; sub basal groove interrupted at middle, subapical groove indistinct.

Elytra ovate (LE/WE 1.43), wider than prothorax (WE/WP 1.18), nearly two times longer than pronotum, (LE/LP 1.92), minutely punctured in weak puncture rows; dorsal contour highest at middle; lateral contour widest at middle, without subapical constriction.

Legs slender; femora strongly clavate; tibiae moderately incurved, strongly serrate along internal margins, with small mucrones at apices.

Male genitalia as illustrated ( Figs. 7A, D View Figure 7 ).

Female. Dimensions: LB: 12.0 – 12.8 (mean 12.4); LE: 7.3 – 7.5 (mean 7.4); LP: 4.0 – 4.1 (mean 4.05); WE: 6.1 – 6.3 (mean 6.2); WP: 4.6 – 4.6; LR: 2.1 – 2.2 (mean 2.15); WR: 1.8 – 2.0 (mean 1.9). N = 2 for all measurements. Larger, elytra wider than prothorax (WE/WP 1.32) otherwise, essentially as in males ( Fig. 5D View Figure 5 ).

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Anita Rukmane-Bārbale

Distribution. The new species is known from two provinces of Luzon Island: General Nakar, Quezon and Bicol, Albay.

Etymology. The epithet jaysoniensis to point on the similarity of this species with its similarity to M. jaysoni Bollino, 2023 .

Comments. The new species appear sympat- ric and is a new mimicry pair example with Pachyrhynchus masatoshiensis sp. nov.