Oncocephala philippinica Uhmann, 1937

Calcetas, Orlando A., Staines, Charles L., Adorada, Jessamyn R., Calilung, Venus J., Caoili, Barbara L. & Jamias, Serlie B., 2021, Review of the Genus Oncocephala Agassiz, 1846 (Coleoptera: Chrysomelidae: Cassidinae: Oncocephalini) in the Philippines, The Coleopterists Bulletin 75 (2), pp. 445-458 : 453-455

Oncocephala philippinica Uhmann, 1937 ( Figs. 15–18 )

Oncocephala philippinica Uhmann 1937: 103 . Type locality: Philippines, Luzon , Laguna; type depository (holotype): SDEI.

Oncocephala angulata Uhmann 1933: 64 (not Gestro) (Philippine species) (misidentification).

Redescription (n = 25). Length = 4.2–5.0 mm (apical margin of head to apex of elytron), width = 2.1–2.8 mm (middle of elytra). Head, pronotum, elytra and legs brown with black tinge; antennae dark brown, antennomeres 10 and 11 paler than remainder ( Fig. 15 ). Head. Compound eyes conical dorsally; cephalic horn pear-shaped to ovoid in dorsal aspect, anterior half distinctly narrower than posterior half ( Fig. 16 ), boat-shaped in lateral aspect ( Fig. 17 ), wedge-shaped anteriorly and rounded posteriorly; cephalic horn formula 20 (4-8-8). Antenna. More than 2× length of pronotum; lateral margins of antennomere 1 slightly convex; antennomere 2 with lateral margins almost straight; antennomere 3 distinctly longer than 4; antennomeres 5–6 broader apically; antennomeres 7–10 quadrate; antennomere 11 distinctly elongate and conical; antennomere 1 without striation, 2–11 with striation, 2–6 broadly striate, 7–11 finely striate. Antennal length 2.7 mm. Pronotum. Distinctly wider than long; anterior margin almost straight medially; lateral protuberance equilateral, moderate, with broad basal margin; posterolateral margin distinctly convex; anterior angle obtuse, posterior angle acute; posterior margin concave laterally, rounded medially; sides narrowly carinate, rugose except medially; with two conical subapical tubercles; medial longitudinal cavity interrupted medially by callosity; pronotal width 2.5 mm; pronotal length 1.2 mm. Scutellar shield. Anterolateral margin wedge-shaped, lateral margin straight, truncate apically. Elytron. Humeral margin with 3 distinct tubercles; scutellar tubercle minute and conical; tubercle between costa II and III minute, latitudinal and ridge-like; humeral tubercle almost same height as tubercle 1 of costa II; lateral margin distinctly broader apically with pronounced medial sinuation and small, irregularly spaced teeth; exterior apical angle almost 90°; apical margin sinuate, wedge-shaped, minutely to indistinctly dentate and sutural angle obtuse; with 10 distinct elytral tubercles; costa II with 4 distinct tubercles: T1 small, equilateral, rounded apically, connected to T2 basally; T2 minute, convex to longitudinal ridge-like, connected to T3 apically; T3 large, convex, with distinctly broad apical and basal margins, connected to T4 basally; T4 minute, convex to longitudinal ridge-like; T2, T3, and T4 coalesced; margin of T2 and T3 broader than margin of T3 and T4; costa III with 1 distinct tubercle: T1 small, equilateral, rounded apically, with broad basal margin; costa IV with 4 distinct tubercles: T1 and T2 below the humeral tubercle minute; T3 and T4 small, conical; costa V without distinct tubercle; elytral tubercle formula 10 (1-4-1-4-0); elytron width 1.1–1.4 mm; elytron length 3.0– 3.5 mm. Leg. Femur slightly rugose, not tuberculate; tibia not rugose ( Figs. 15, 18 ).

Material Examined. Holotype. Philippines: LUZON: Zambales: Triboa , SBFR, 12-xii-1996, V. P. Gapud & M. Saulog (12, UPPC-24033 ) . Paratypes. Philippines: Quezon: Tayabas, Baker (1, SDEI-09775 ) ; Tayabas, Malinao, Baker (1, RBINS) ; Laguna: Mt. Maquiling , 26-xii-1930, F. C. Hadden & G. C. Ladrere (1, SDEI) . Other material. No locality: Bur. of Agri. , C. R. Jones (2, USNM-832 ); Philippines: LUZON: Benguet: Kabayan, K. Dizon (1, UPPC); Laguna: Mt .

Makiling, 5-i-1932, F.C. Hadden (1, MGFT) ; Los Banos, Mt. Maquiling , 24-xi-1935, 200 ASL, V. J. Madrid (1, SDEI-09777 ) ; Los Banos, Mt. Makiling , Baker (1, RBINS) ; Los Banos, Mt. Makiling , Baker (2, USNM) ; 2 ii-1918, S. Dorlutin (1, SDEI-09778 ; 1, SDEI-09773 ) ; 4-i-2015, K. B. Cruz (1, UPPC-24219 ) .

Distribution. Philippines (Luzon, Mindanao, Mindoro).

Host Plants. Unknown.

Remarks. The species can be distinguished from all other species of Oncocephala in this study by the highest number of tubercles on the dorsal surface and the margins of the cephalic horn with a formula of 20 (4-8-8). The lateral margins of the pronotum are distinctly convex while they are slightly convex, wedge-shaped, concave, almost parallel or straight in all other species of Oncocephala . Also, tubercles 1 and 3 of costa II are uniformly and distinctly larger than all other tubercles in all observed specimens.A pale yellow unidentified mite species was found on the side of the pronotum of one specimen (SDEI-09777).

Figures

Figs. 15–18. Oncocephala philippinica. 15) Habitus, dorsal aspect; 16) Cephalic horn, dorsal aspect; 17) Cephalic horn, lateral aspect; 18) Habitus, lateral aspect (holotype from SDEI, courtesy of K. Nadein).