Webbia Hopkins, 1915

Sittichaya, Wisut, Smith, Sarah M. & Beaver, Roger A., 2023, New species, taxonomic changes and newly recorded species of Webbia Hopkins, ambrosia beetles from Thailand and neighbouring countries (Coleoptera: Curculionidae: Scolytinae: Xyleborini), Zootaxa 5264 (1), pp. 47-63 : 49

Webbia Hopkins, 1915

Webbia Hopkins, 1915: 222 .

Xelyborus Schedl, 1939: 349 . Synonymy: Browne 1963: 57.

Prowebbia Browne, 1962: 208 . Synonymy: Browne 1972: 25.

Type species. Webbia dipterocarpi Hopkins, 1915 ; original designation.

Diagnosis. 1.9–3.4 mm long, 2.6–3.75× as long as wide. Antennal funicle 2-, 3- or 4-segmented; pronotum conspicuously elongate, rectangular in dorsal view with anterolateral angles inflated (type a in dorsal view), disc flat; scutellum not apparent; elytral bases with a dense tuft of setae associated the elytral mycangia; elytra with few setae, abruptly truncate, declivity usually armed with marginal teeth or ornamented with large projections; protibiae slender, outer margin armed with more than nine denticles, posterior face inflated and unarmed or finely granulate.

The genus is distinguished from the closely similar genus, Pseudowebbia Browne , by the following characters ( Webbia given first): anterior margin of first antennal club segment concave or straight, distinct throughout, posterior face with no or one suture visible vs anterior margin of first antennal club segment convex, sometimes obscured by hairs laterally, posterior face with two sutures visible; pronotum elongate, widest anterior to middle, summit in anterior third, asperities subgranulate, present only anterior to summit vs pronotum not elongate, widest at or behind middle, summit at or a little behind middle, transverse asperities cover more than anterior half; elytral declivity usually with hairlike setae vs elytral declivity usually with scale-like, flattened setae; protibia narrow, with outer margin more or less evenly curved, inflated and sometimes finely granulate posteriorly vs protibia widened to an obliquely truncate apex, not inflated and granulate posteriorly. Webbia is distinguished from other genera which have species with a truncate declivity, such as Amasa Lea , Cyclorhipidion Hagedorn , and Truncaudum Hulcr & Cognato , by the absence of an apparent scutellum.