Cissidium triangulum Darby, 2019

Figs 4E, 85

Material examined

Holotype MALAYSIA • Sarawak, Mulu; pitfalls in alluvial forest; Mar. 1978; N.M. Collins leg.; genitalia not dissected; BMNH.

Supplementary description

The following description amplifies the type description of Darby (2019), in particular by adding more details of the meso- and metaventral characters, in order to conform with the entries in the present paper.

SIZE. Habitus (Fig. 85A), length 0.79 mm.

COLOUR. Yellow brown, antennae, legs, and pubescence yellow.

HEAD. Distance across eyes 0.22 mm; antennomeres III–XI, length 0.31 mm; mentum triangular the anterior margin much longer than the basal, stipes also triangular, broadest at base (Fig. 4E).

PRONOTUM. Length 0.19 mm, width 0.28 mm, pubescent, shallowly foveolate; sides rounded then straight before rectangular hind angles, border crenulate, not continuing along posterior margin, median emargination angulate (Fig. 85B).

ELYTRA. Length 0.41 mm, width 0.34 mm, pubescent, the pubescence slightly longer than on the pronotum, shallowly foveolate.

MESOVENTRITE. Median extension of collar parallel-sided, short, mid-keel setose and rugose before keel; keel narrow, tapering to a point at the base of the mesocoxae; mesoventral lateral margins almost straight before turning to meet mesocoxae, then obscured; humeri barely toothed (Fig. 85C).

METAVENTRITE. With scattered pubescence throughout, disc plain, length 0.14 mm, distance across spines 0.08 mm; mesocoxal posterior margins without serrations.

Remarks

The only species of Cissidium from Sarawak in this group.