Metapocyrtus (Metapocyrtus) tetramaculatus, Rukmane-Bārbale, 2023

Rukmane-Bārbale, Anita, 2023, Four new species of the genus Metapocyrtus Heller, 1912 (Coleoptera: Curculionidae: Pachyrhynchini) from Mindanao Island, Philippines, Baltic Journal of Coleopterology 23 (2), pp. 283-294 : 284-286

Metapocyrtus (Metapocyrtus) tetramaculatus sp. nov.

( Fig. 1A , 2 , 4A,B )

Type material. Holotype, male: ‘’ PHILIPPINES / Mindanao , Agusan, Sibagat / IX. 2015 / local collector leg.’’ (white rectangular label, printed) // ‘’ HOLOTYPE / M. (M.) tetramaculatus / Rukmane-Bārbale, 2023’’ (red rectangular label, printed).

Paratypes: (3 females): ‘’ PHILIPPINES / Mindanao, Agusan, Sibagat / IX. 2015 / local collector leg.’’ // ‘’ PHILIPPINES / Mindanao, Bukidnon, Cabanglasan / X. 2015 / local collector leg.’’// ‘’PHILIP-

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PINES / Mindanao, Bukidnon, Cabanglasan / VIII. 2022 / local collector leg.’’ (white rectangular label, printed), with additional red label: ‘’ PARATYPE / M. (M.) tetramaculatus / Rukmane-Bārbale, 2023’’ (all in DUBC).

Description. Holotype, Male. ( Fig. 2A ) Dimensions: LB: 6,1, LR: 1,1, WR: 0,9, LP: 2,1, WP: 1,9, LE: 4,0, WE: 2,8. N = 1 for all measurements.

Four new species of the genus Metapocyrtus Heller, 1912 ( Coleoptera : Curculionidae : Pachyrhynchini ) from …

Coloration. Integument black, shiny, with markings of round, metallic green to turquoise scales.

Head. Dorsal surface smooth, with longitudinal line of green to turquoise scales; surface between eyes with sparse white to greenish setae; genae with patch of metallic green to turquoise scales and green hair-like scales; shallow medial longitudinal groov from base of the eyes to base anterior margin of prothorax; transverse, moderate fur-

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row at base of eyes confluent with medial longitudinal groove; eyes large, strongly convex from outline of head.

Rostrum. ( Fig. 1A ) longer than wide (LR/WR: 1,22), smooth at posterior half, slightly punctured at anterior half; green to white setae from apical ½ to base; dorsum with moderate medial longitudinal furrow and corresponding shallow concavity; in dorsal contour straight; in lateral contourraised dorsally at base, then gradually declined to apex; lateral parts covered with long white to shiny green setae.

Antennae with antennal scrobe not reaching margin of eye, curved downwards; antennal scape reaching anterior margin of prothorax; funicular segment I nearly three times as long as wide, slightly longer than II, segment II nearly two times longer than III, segments III – VI as long as wide, segment VII larger, as longas wide, club 2,5 times as long as wide.

Prothorax sub cylindrical, slightly longer than wide (LP/WP: 1,1), strongly punctured, with corresponding, short, white setae; widest just before the middle; in dorsal contour narrowed along anterior margin, widened to just before the middle, gradually narrowed to before posterior margin, straight to posterior margin; with the following markings of round, metallic green to turquoise shales: 1) two spots along anterior margin on disc, each redirected laterally; 2) two spots at basal part, from middle to before posterior margin on disc, each redirected laterally; anterior groove confluent at disc, slightly redirected to middle; posterior groove confluent at disc, curved upwards at lateral parts.

Elytra sub-ellipsoidal, (LE/WE: 1,42), wider than prothorax nearly twice as long as prothorax (WE/WP: 1,47; LE/LP: 1,9); punctured in all length, without expressed

286 puncture rows; in dorsal contour widest just before the middle, moderately convex; each elytron with the following scally markings of round, metallic green to turquoise scales: 1) two sub basal spots; 2) three spots at the medial part; 3) three spots along apical 1/3; 4) longitudinal apical stripe; goldish, thick setae from apical ½ to apex.

Fore tibia without denticles along internal margin. Male genitalia as shown in Fig.4A, B .

Female. Elytra wider with strongly expressed apex, legs not as thick as in males, otherwise as in males; dorsal habitus as in Fig. 2B .

Differential analyses. The new species by black body colour, small size and presence of four scally spots on disc of prothorax, two at basal part and two along apical margin, is similar to M. (M.) flavomaculatus Cabras & Medina, 2021 , the new species can be easily distinguished by the following characters: 1) large, strongly prominent eyes in M. (M.) tetramaculatus sp. nov. instead of relatively small, weakly prominent eyes in M. (M.) flavomaculatus Cabras & Medina ( Fig. 1B ); 2) scally markings of green to turquoise colour in M. (M.) tetramaculatus sp. nov. instead of yellow ochre spots in M. (M.) flavomaculatus Cabras & Medina, 2021 ( Fig. 3 ); 3) narrow body of M. (M.) tetramaculatus sp. nov.

Distribution. North Central Mindanao Island, Bukidnon and Agusan Provinces.

Etymology. The specific epithet is a latinised designation of four scally spots on disc of prothorax. Tetra – four, maculata – spots.

Figures

Fig. 1. Dorsal view of rostrum of selected species: A – M. (M.) tetramaculatus sp. nov.; B – M. (M.) flavomaculatus Cabras & Medina, 2021; C – M. (M.) fulvus sp. nov.; D – M. (T.) unalineatus sp. nov.; E – M. (T.) pseudolanaoensis sp. nov.; F – M. (M.) lanaoensis Bollino, 2021.

Fig. 2. Habitus of M. (M.) tetramaculatus sp. nov. A – dorsal view, male, holotype; B – dorsal view, female; C – lateral view, male, holotype.

Fig. 4. Male genitalia of selected species, A, C, E – aedegal body in lateral view; B, D, F – sternite IX; A, B – M. (M.) tetramaculatus sp. nov., C, D – M. (M.) fulvus sp. nov., E, F – M. (T.) unalineatus sp. nov.

Fig. 3. Habitus of M. (M.) flavomaculatus Cabras & Medina, 2021, female; A – dorsal view; B – lateral view.