Monolepta jacobyi Weise, 1908

Hazmi, Izfa Riza & Wagner, Thomas, 2022, Revision of Monolepta Chevrolat, 1836 from the Sundaland area (Coleoptera: Chrysomelidae: Galerucinae), Bonn zoological Bulletin 71 (2), pp. 139-176 : 150-152

Monolepta jacobyi Weise, 1908

Figs 16–18

Monolepta jacobyi Weise, 1908: 326 .

Replacement name for Monolepta basimarginata Jacoby, 1884a: 54 a junior homonym of Galleruca basimarginata Boisduval, 1835 a species from New-Guinea, transferred to Monolepta by Weise (1908).

Type material. Monolepta basimarginata . Lectotype: “Rawas, 5.78 / Monolepta basimarginata Boisd. ?” ( RMNH; Fig. 16 ). Type locality: 2º31′ S / 102º54′ E. Jaco- by mentioned several locations (i.e., specimens) in his original publication and we herein designate a lectotype to fix the name on a single specimen. The specimens has a location label from the type locality, the species name with “Boisd.?” is in Jacoby′ s handwriting, but not on usual light blue paper he used for type labels. Seems so that Jacoby was not completely convinced about his description.

Further material examined.– Indonesia. 14 ex., Java, Ardja-Sari , 6.91ºS / 107.67ºE, Preanger ( RMNH) ; 24 ex., Sumatra, 4º27′ S / 102º59′ E, M. Knappert ( RMNH) ; 3 ex., Java, Malang , 7º58′ S / 112º37′ E, A. Koller ( RMNH) ; 1 ex., Java, Piep ( RMNH) ; 1 ex., Sumatra, Palembang , 2º59′ N / 104º45′ E, M. Knappert ( RMNH) ; 5 ex., Sumatra, Solok , 0º48′ S / 100º38′ E, P. O. Stolz ( RMNH) ; 4 ex., Su- matra, Padang , 0º58′ S / 100º37′ E, J. D. Pasteur ( RMNH) ; 1 ex., Palembang, Boengamas , 2º59′ S / 104º45′ E, G. van Hassen ( RMNH) ; 1 ex., W. Java ( RMNH) ; 4 ex., Java, 7º35′ S / 110º42′ E, Baly Coll. ( BMNH) ; 1 ex., Su- matra, Sir S. Raffles ( BMNH) ; 3 ex., Sumatra, Sibolan- git, 3º18′ N / 98º35′ E, Mjoberg ( NHRS) ; 2 ex., Medan , 3º35′ N / 98º40′ E, Mjoberg ( NHRS) ; 1 ex., Lombok , 8º39′ S / 116º19′ E, Carl Auriv ( NHRS) ; 1 ex., Java, Desa Kembangan , 6º14′ S / 106º48′ E, Drescher ( MNHU) ; 2 ex., Sumatra ( MNHU) ; 1 ex., Spjg. , 0º27′ S / 100º54′ E, X.1877 ( RMNH) ; 2 ex., Sumatra, Pagherang-Pisang , X.1890.– III.1891, E. Modigliani ( BMNH) ; 2 ex., Java occident., Mons Gede 4000′, 6º46′ S / 106º57′ E, VIII.1892, H. Fruhstorfer ( RMNH) ; 3 ex., Java occident., Pengalengan 4000′, 6º12′ S / 106º56′ E, 1893, H. Fruhstorfer ( RMNH) ; 1 ex., Java occident., Sukabumi , 6º55′ S / 106º55′ E, 1893, H. Fruhstorfer ( RMNH) ; 2 ex., Mentawei Sipora , 2º10′ S / 99º41′ E, V.– VI.1894, Modiglianii ( MNHU) ; 12 ex., Borneo Exped.; Borneo, Poelau Sibau , VI.1894, Dr. J. Bultirofer ( RMNH) ; 3 ex., Java, Banjoewangi , 8º12′ S / 114º22′ E, 1910, Mac Gillavry ( RMNH) ; 5 ex., Java, Nongkodjadjar , I.1911, E. Jacobson ( RMNH) ; 4 ex., Sumatra, Siolak Daras, Korinchi Valley , 3100 ft., III.1914 ( BMNH) ; 1 ex., Java, 1921, Kerkhoven ( RMNH) ; 1 ex., West Sumatra, Siberut Island , 1º22′ S / 98º54′ E, IX.1924, C.B.K. & N.S ( BMNH) ; 13 ex., Sipora Island , West Sumatra, 2º10′ S / 99º41′ E, X.1924, C. B. K. & N. S; H. H. Karny ( BMNH) ; 1 ex., Indonesia, W. Java, Poentjak-pas, ca. 1000 m, Onderneming “Tjiliwoeng”, VI.1932, W. C. van Heurn ( RMNH) ; 1 ex., Java, Moeria , 16. VII.1933, P. H. V. Doesburg ( RMNH) ; 1 ex., East Java, Soerabaja and surroundings, 7º17′ S / 112º44′ E, 1938, W.C. van Heurn ( RMNH) ; 7 ex., N. Sulawesi, Mt. Ambang nr Kotamobagu , 0º44′ N / 124º18′ E, 20 km E of alt. m. ca. 1000, 28.– 29. V.1985, J. Huijbregts ( RMNH) ; 25 ex., Sulawesi Utara, Danau Modat , 1200 m near Kotamobagu, 0º43′N / 124º27′ E, VIII.1985 ( BMNH) ; 1 ex., C Sulawesi, Lore Lindu NP Dongi Dongi Shelter, 1º31′ S / 120º11′ E, alt. 940 m, 3.–9. XII.1985, J. Krikken ( RMNH) ; 1 ex., Sumatra, Umg. Prabal , 1050 mm, 2°47′ N / 98°56′ E, VIII.1992, U. Buchsbaum ( NME) ; 6 ex., S Sumatra, Lampung Prov., Bukit Barisan Selatan , 5º4′ S / 104º4′ E, 7.–17.II.2000, Liwa, J. Bezděk ( CJB) ; 1 ex., Indone- sia, Bali, 8º24′ S / 115º11′ E, 19.–21. III.2007, B. H. Izfa ( UKM) . – Malaysia. 1 ex., Perak, 4º48′ N / 100º48′ E, Doherty ( BMNH) ; 1 ex., Malay Penin., Selangor F. M. S., Kuala Lumpur, Batu Caves , 3º15′ N / 101º40′ E, IX.1921, H. M. Pendlebury ( BMNH) ; 5 ex., Perak, F. M. S. Jor camp, 3º54′ N / 101º34′ E, VIII.–IX.1922, E. Sei- mun ( BMNH) ; 12 ex., Perak, F. M. S. Batang Padang, Jor Camp , 3º54′ N / 101º34′ E III.1924, F. M. Pendlebury ( BMNH) ; 1 ex., Malaya, Terengganu, Jerangau Estate, 4º54′ N / 103º11′ E, 7.II.1966, Dept. of Agriculture ( BMNH) ; 1 ex., S. W. Sabah nr Long Pa Sia ( East ) ca. 1000 m, 5º20′ N / 117º10′ E, 25.XI.–7. XII.1987, C. v. Achterberg ( RMNH) ; 2 ex., Perak, Tapah, Lata Iskandar , 4º12′ N / 101º15′ E, 3.–4.IV.1990, 15.IX.1995, Ismail & Ruslan ( UKM) ; 1 ex., Borneo, Sarawak, Kuching, Bako National Park , 1º43′ N / 110º28′ E, 5. V.1999, P. Vortruba ( CJB) ; 3 ex., Kelantan, 90 km N of Gua Musnag, Mt. Basor 1770 m, III.2015, P. Cechovsky ( CJB) . – Philippines. 1 ex., Philli. Island ( BMNH) ; 1 ex., Los Banos , 14º10′ N / 121º14′ E, P. I. Baker ( NHRS) ; 1 ex., Luzon , 16º33′ N / 121º15′ E, Semper ( IRSN) ; 1 ex., Coll. Duvivier ( IRSN) ; 1 ex., Manila 14º35′ N / 120º59′ E ( MNHU) ; 4 ex., Luzon , Id. Nueva Viscaya, Sta. Fe. Dalton Pass, 16º35′ N / 121º15′ E, 900 m, 8.–12. VI.1991, Rolland A. Muller ( RMNH) ; 2 ex., N. Luzon, Mts. Prov. Chatel , 17º02′ N / 121º03′ E, 24.IX.–14.X.1988, Cerny & Schint- lmeister ( MNHU) ; 10 ex., N. Luzon, Ifugao Banaue vic., 16º54′ N / 121º06′ E, 22.IX.–16.X.1988, Cerny & Schintlmeister ( MNHU) . – Singapore. 2 ex., Singapore , 1º21′ N / 103º49′ E, C. J. Saunders ( BMNH) .

Redescription

Total length. 6.40–7.70 mm (mean 6.86 mm; n = 10).

Head. Finely punctuated, entirely pale yellow to brown. Labrum and mandible brown. Antenna slender, extending beyond the middle of elytra, entirely yellow ( Fig. 17A ) or terminal antennomere with brownish tip ( Fig. 16b ). Second and third antennomere approximately of the same length; ratio length of second to third antennomere 0.80–1.00 (mean 0.92); ratio length of third to fourth antennomere 0.36–0.45 (mean 0.40; Fig. 17B ).

Thorax. Pronotum sparsely punctuated, entirely yellow, surface slightly convex. Pronotal width 2.00– 2.25 mm (mean 2.12 mm), ratio length to width 0.59–0.61 (mean 0.60). Scutellum yellow. Meso- and metathorax black. Elytron yellow, basal margin black, sometimes extend to the lateral margin as up to anteri- or half; finely punctuated. Elytral length 5.25–6.00 mm (mean 5.61 mm), maximal width of both elytra together 3.50–4.00 mm (mean 3.79 mm), ratio of maximal width of both elytra together to length of elytron 0.66–0.70 (mean 0.68). Legs yellow to pale brownish.

Abdomen. Yellow to yellowish-brown.

Male genitalia. Median lobe long and slightly conical towards apex. Median spiculae long and slender, lateral spiculae club-shaped with lobe-like apex ( Fig. 17 Ca), ventral spiculae weakly sclerotised, hardly visible. Ventral groove very broad and continuously convergent to the orifice ( Fig. 17 Cc).

Female genitalia. Spermatheca with spherical nodulus, median part long and curved cornu ( Fig. 17D ). Bursa sclerites strongly sclerotized; dorsal and ventral bursa sclerites almost of the same size, both carrying strong spines ( Fig. 17E ).

Diagnosis. Monolepta jacobyi is one of the largest Monolepta species of Sundaland (total length 6.40– 7.70 mm). This yellowish species with narrow black elytral base at humeri looks similar to the much smaller M. kuninghitam sp. nov. (total length 3.70–4.35 mm). The genitalic characters are very different between both species ( Figs 17C–E , 51C–E ). The combination of large size, uniform yellow dorsal colouration with narrow black base at humerus is very characteristic for M. jacobyi .

Distribution. This abundant species is mainly known from the Sundaland area, eastwards to Sulawesi ( Fig. 18 ).

Figures

Fig. 16. Type material of Monolepta jacobyi Weise, 1908. – Monolepta basimarginata Jacoby, 1884, lectotype (RMNH).

Fig. 17. Monolepta jacobyi Weise, 1908. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.

Fig. 18. Distribution of Monolepta jacobyi Weise, 1908.

Fig. 51. Monolepta kuninghitam sp. nov. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.