Cissidium arcuatum sp. nov.

urn:lsid:zoobank.org:act: 990BE6BE-B990-4332-91A4-11B17CD39C1B

Figs 6D, 64

Etymology

Johnson ms name, presumed to be after the shape of the pronotal lateral margins.

Material examined

Holotype VIETNAM • ♀; Tonkin, Hoabinh; A.de Cooman leg.; BM.1940-13; BMNH.

Paratype VIETNAM • 1 ♀; same collection data as for holotype; mounted verso; MMUE,

Description

SIZE. Habitus (Fig. 64A), length 0.67 mm.

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

HEAD. With a shallow linear depression behind the eyes, width across eyes 0.21 mm; antennomeres III–XI length 0.36 mm, III–IX length 0.20 mm, X–XI length 0.16 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.18 mm, width 0.30 mm, with scattered pubescence and two short linear depressions converging posteriorly to base at sides of emargination opposite scutellum; lateral margins rounded and then sinuate to obtuse hind angles, bordered, the border extending along the posterior margin to the medial emargination (Fig. 64B).

ELYTRA. Length 0.47 mm, width 0.39 mm, pubescent, shallowly foveolate, length of setae as pronotum.

MESOVENTRITE. Collar with wide medial area on the anterior margin without reticulation; medial extension of collar short, wide, coarsely sculpted; mid-keel parallel-sided with two concave insertions anteriorly, hind angles not reaching anterior margins of mesocoxal borders; keel with a series of ± eight setae broadest anteriorly then narrowing with slightly concave margins to a rounded tip at the interruption of the mesocoxal borders; mesoventral lateral margins serrate; humeri strongly toothed (Fig. 64C).

METAVENTRITE. Length 0.17 mm, width across spines 0.11 mm, with scattered setae, disc simple. Posterior margins of mesocoxal cavities not serrate.

WINGS. Macropterous.

GENITALIA. Female spermatheca Fig. 6D; male aedeagus as Fig. 6 Fa–b, but length 0.10 mm.

Remarks

Distinguished from C. aristophanousi sp. nov. by the two elongate foveae on the pronotum.