Urocorthylus Petrov, Mandelshtam & Beaver, 2007

Johnson, Andrew J., Sittichaya, Wisut, Lai, Shengchang, Li, You & Beaver, Roger A., 2023, The tribal placement of Urocorthylus Petrov, Mandelshtam & Beaver, with a description of the male of U. hirtellus Petrov et al., and notes on its biology (Coleoptera: Curculionidae: Scolytinae), Zootaxa 5306 (1), pp. 116-126 : 124

Key to species and sexes of Urocorthylus Petrov, Mandelshtam & Beaver, 2007

1 Frons below upper margin of eyes with a distinct shining, impunctate median line. Antennal club subcircular, 1.2‒1.3 times as long as wide. Smaller species, 1.80‒2.35 mm long. ( U. fanii ) .................................................. 2

- Frons median area with longitudinal rugosities and punctures, without impunctate median line. Antennal club oval, 1.5 times as long as wide. Larger species, 2.40‒3.10 mm long. ( U. hirtellus ) ................................................ 3

2 Body short and stout, 2.5‒ 2.6 times as long as wide. Pronotum less elongate, 0.9‒1.0 times as long as wide. Interstriae 1 and 3 on elytral declivity without tubercles. Pubescence denser and longer, with a woolly appearance............ U. fanii (male)

- Body more elongate, 2.75‒2.80 times as long as wide. Pronotum more elongate, 1.0‒1.1 times as long as wide. Interstriae 1 and 3 on elytral declivity each with a row of small, pointed tubercles. Pubescence sparser and shorter, giving a less woolly appearance............................................................................. U. fanii (female).

3 Body short and stout, 2.36–2.52 times as long as wide. Elytral declivity truncate, its face flat, interstriae each bearing a row of small tubercles, striae weakly impressed. Pubescence very dense on whole elytra, giving a very woolly appearance.............................................................................................. U. hirtellus (male)

- Body more elongate, 2.5‒2.7 times as long as wide. Elytral declivity steep, but not truncate, weakly convex, interstriae 1 raised, and it and interstriae 3 with a row of small granules, interstriae 2 flat, without granules. Pubescence less dense................................................................................................ U. hirtellus (female)