Cyclorhipidion inarmatum ( Eggers, 1923 )

Buhroo, Abdul Ahad, 2024, A taxonomic monograph of subfamily Scolytinae (Coleoptera: Curculionidae) in the Western Himalaya, Zootaxa 5533 (1), pp. 1-82 : 67-68

53. Cyclorhipidion inarmatum ( Eggers, 1923)

( Figure 67 )

= Xyleborus inarmatus Eggers, 1923

= Xyleborus vagans Schedl, 1977

This species is diagnosed by the combination of following morphological characters: ♀ frons weakly convex and devoid of any median lines; surface finely reticulate, upper half with irregular deep punctures and lower half with minute granules and fine hairs; eyes elongately oval and nearly half of its width emarginated; antennal scape short; club flat (type 3); pronotum longer than wide, rounded (type 7) from dorsal view and from lateral view as well; anterior margin broadly rounded and unarmed; anterior two-thirds with small asperities; posterior portion finely reticulate with distinct punctures; scutellum large, shiny and tongue-shaped; type 3; pronotum scutellum visible; elytra 1.5× as long as pronotum and 1.6× as long as wide; basal margin substraight, lateral sides subparallel nearly upto two-thirds, converging posteriorly with rounded apex; discal striae feebly impressed, marked by shallow punctures, each with a microhair; interstriae flat somewhat wider than striae with irregular granules and fine hairs; declivity commencing on posterior third, face steeply rounded; striae distinctly impressed with distinct small punctures, each with a microhair; interstriae 1 and 3 feebly elevated armed with large tubercles; interstriae 2 always unarmed; postero-lateral margins rounded; setae on interstriae 1 in two confused rows, interstriae 2 with uniseriate setae; body color yellowish brown, elytra comparatively darker; body length: 2.8–3.0 mm, 2.8× as long as wide.

Material examined: Lectotype in NMNH (image), Smithsonian Institution , Washington, D.C. USA

Distribution: India: Himachal Pradesh, West Bengal. Bhutan, China: Yunnan, Indonesia: Sumatra, Laos, Myanmar, Thailand, Vietnam.

Hosts: Recorded from Castanopsis and Quercus ( Fagaceae ), and probably with a close association with Fagaceae ( Beaver et al. 2014) .

Genus Diuncus Hulcr & Cognato, 2009

Diuncus species are distinguished by the following combination of morphological characters: body length: 1.5–3.0 mm; antennal club truncate, segment 1 corneous and dominant on both sides; pronotum stout, with 4–6 serrations on anterior margin; pronotum from lateral view rounded, robust (type 5), from dorsal view rounded (type 1), rarely conical and angulate (type 6); declivity flat and broad, margins broadened and distinctly carinate, declivital base often armed with one or two pairs of denticles; protibiae obliquely triangular, with 3–5 large denticles, denticles distinctly longer than wide; scutellum visible and flush with the elytra; mycangial tufts absent; and procoxae contiguous; host: deciduous trees.

Figures

FIGURE 67. Cyclorhipidion inarmatum. Lectotype female: dorsal view A, lateral view B. (Smith et al. 2020).