Tricosa Cognato, Smith & Beaver, 2020

Tricosa Cognato, Smith & Beaver, 2020 (Cognato et al. 2020a): 547.

Type species.

Xyleborus metacuneolus (Eggers, 1940); original designation.

Diagnosis.

2.2-3.8 mm, 2.5-3.0 × as long as wide. Tricosa is distinguished by the following combination of characters: antennal funicle 4-segmented; antennal club type 3 with one or two sutures visible on the posterior face; protibiae distinctly or obliquely triangular with six or fewer denticles on outer margin and posterior face flattened and unarmed; scutellum small, flush with elytra surface; mycangial tufts absent; elytra attenuate; elytral discal punctures seriate; and posterolateral costa absent (Cognato et al. 2020a).

Tricosa resembles Cyclorhipidion, Cryptoxyleborus, and Fraudatrix with which it shares either a setose and/or an attenuate appearance. Tricosa is most similar to Cyclorhipidion with which it shares a setose appearance, but is distinguished by the following diagnostic characters ( Tricosa given first): protibiae obliquely triangular vs. semi-circular with evenly rounded outer edge; typically attenuate elytra vs. rounded, truncate or excavated; outer margin of protibiae with five or six socketed denticles vs. 6-9+; anterior margin of the pronotum typically serrate vs. unarmed (rarely serrate). Tricosa is distinguished from Cryptoxyleborus by the visible scutellum, and from Fraudatrix by the 4-segmented antennal funicle and antennal club type 3 with one or two sutures visible on the posterior face, and the pronotal disc being as long as or shorter than the anterior slope (Cognato et al. 2020a).

Similar genera.

Cryptoxyleborus, Cyclorhipidion, Fraudatrix .

Distribution.

Throughout the Oriental region and New Guinea.

Gallery system.

Not described.