Ceresium promissum 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 : 26-29

Taxon classification Animalia Coleoptera Cerambycidae

Ceresium promissum Dillon & Dillon, 1952 Fig. 10

Ceresium promissum : Dillon and Dillon 1952: 25, Fiji: Viti Levu, Colo-i-Suva, holotype (BPBM).

Description.

Based on the holotype specimen (BPBM) and original description. Size 8.9 mm long, 1.9 mm wide at humeri; integument color dark brown (pale brown towards elytral apex) (Fig. 10a). Head with shallow interantennal tubercle region, tubercles only slightly raised; punctate with very sparse ochraceous pubescence on tubercles and throughout frons; vertex and occiput with sparser ochraceous pubescence. Frons and frontoclypeal margin punctate with sparse, short and long, ochraceous hairs (Fig. 10b). Antennae long, extending beyond elytra by two antennomeres. Antennae with vestiture of short, dense, ochraceous setae. Antennomeres unspined and expanded at apices; last antennomere about 1.1 times length of penultimate. Scape shortest in length almost subequal to antennomere 10; 5 longest. Scape short, broad and clavate, extending slightly beyond pronotal front.

Pronotum broadly arcuate, widest across middle and slightly longer than wide; glabrous median line, vertically on basal center of pronotum. Pronotum with sparse punctures and sparsely scattered pubescence elsewhere (Fig. 10c). Elytron with sparse and regularly spaced ochraceous pubescence. Punctation dense, shallow and gradually becoming shallower and smaller in size towards apex. Elytral apex rounded to suture. Scutellum triangular, narrowly rounded, covered with sparse, short ochraceous pubescence. Legs moderate in length, femora distinctly but gradually clavate, hind femora 2.98 mm in length extending to apical margin of 5th ventrite.

Venter of abdomen and thorax with sparse, translucent pubescence throughout, not obscuring integument. Length of abdomen 4.04 mm. Prosternal process very narrow, only extending about halfway between procoxae which are nearly contiguous as a result. Procoxal cavities widely open posteriorly (Fig. 10d). Mesocoxae closed laterally to mesepimeron. Mesosternum not produced vertically, without anterior tubercle or sulcus; with very slight lateral projections into mesocoxae. Apex of terminal ventrite subtruncate without notch.

Remarks.

By the key characters, Ceresium promissum is most similar to Ceresium decorum . In Ceresium promissum , the mesosternal process has its basal notch parallel-sided and the pronotum has a narrow, glabrous, impunctate line at the middle restricted to the posterior half. In Ceresium decorum , the mesosternal process has the basal notch at an angle and the pronotum has the narrow, glabrous, impunctate line at middle centrally located. This species is endemic to Fiji and known only from Viti Levu where the holotype was collected in June ( Dillon and Dillon 1952).