Ceresium repandum Dillon & Dillon, 1952

Waqa-Sakiti, Hilda, Winder, Linton & Lingafelter, Steven W., 2015, Review of the genus Ceresium Newman, 1842 (Coleoptera, Cerambycidae) in Fiji, ZooKeys 532, pp. 15-53 : 31-33

Taxon classification Animalia Coleoptera Cerambycidae

Ceresium repandum Dillon & Dillon, 1952 Fig. 12

Ceresium repandum Dillon & Dillon, 1952: 16, Fiji: Viti Levu, Nandarivatu, holotype (BPBM).

Redescription.

Based on the holotype specimen (BPBM) and original description. Size 14.3-18.0 mm long, 3.5-5.2 mm wide at humeri; integument color brown to reddish brown (Fig. 12a). Head with deep interantennal tubercle region, tubercles raised; punctate with dense ochraceous pubescence on tubercles and throughout frons; vertex and occiput with sparser ochraceous pubescence. Ochraceous pubescence denser around eye margins. Frons and frontoclypeal margin punctate with sparse, short and long, ochraceous hairs (Fig. 12b). Antennae long, extending beyond elytral apices by 5 antennomeres. Antennae with vestiture of short, dense, ochraceous setae. Antennomeres unspined and not expanded at apices; last antennomere about 1.3 times length of penultimate. Antennomere 5-6 longest except for 11 (4.12 mm) and subequal in length. Scape short (1.55 mm), clavate, just extending to pronotal apex.

Pronotum strongly arcuate, widest across slightly above middle, and slightly wider than long; small tubercles at sides located at the lateral lower half. Pronotum with sparse punctures and dense pubescence laterally (Fig. 12c). Elytron with parallel sides and gradually attenuate, with dense and regularly spaced ochraceous pubescence. Punctation sparse, shallow and gradually becoming shallower and smaller in size towards apex. Elytral apex rounded to suture. Scutellum narrowly rounded, covered with dense, ochraceous pubescence. Legs moderate in length, femora distinctly but gradually clavate, hind femora (5.02 mm) base extending to apical margin of fifth ventrite.

Venter of abdomen and thorax with sparse, ochraceous pubescence throughout, not obscuring integument. Length of abdomen 4.95 mm. Prosternal process narrow, gradually declivous, weakly expanded at apex, approximately 1/4 width of procoxa. Procoxal cavities open posteriorly (Fig. 12d). Mesocoxae closed laterally to mesepimeron. Mesosternum not produced vertically, without anterior tubercle or sulcus; with pronounced lateral projections into mesocoxae. Apex of terminal ventrite subtruncate without notch.

Remarks.

This species is very distinctive among the Fijian Ceresium by having very long antennae (extending beyond the elytral apices by more than 5 segments), by the laterally multi-tuberculate pronotum, and by the post-medial black macula on each elytron. It is most similar to Ceresium tuberculatum in the key characters but can be distinguished from that species by having the pronotum strongly arcuate with dense, white pubescence at the sides (the pronotum in Ceresium tuberculatum is quadrate with patchy yellow pubescence on sides and posterior margin). This species is endemic to Fiji and known only from Viti Levu where both known specimens were taken at lights in October ( Dillon and Dillon 1952).