New species of weevils of the genus Trachyphloeoides Formánek, 1907 (Coleoptera: Curculionidae: Blosyrini) from China

Abstract

Brief morphological characteristic of the little known genus Trachyphloeoides Formánek, 1907 (type species T. sordidus Faust, 1890) is given. It is known from Gansu, Sichuan and Yunnan provinces in China. The genus includes eight species, from which six are described herein as new for science: T. sordidus (Gansu Province), T. io Grebennikov, 2018 (Yunnan Province), T. belousovi sp. n. (Sichuan Province), T. hartmanni sp. n. (Sichuan Province), T. kabaki sp. n. (Yunnan Province), T. potanini sp. n. (Gansu Province), T. reuteri sp. n. (Sichuan Province), T. shokhini sp. n. (Yunnan Province). Trachyphloeoides potanini sp. n. is similar to T. sordidus in the shape of the rostrum, strongly compressed in the basal half and blunted apex of the penis; the new species differs from the latter one in the following features: pronotum moderately transverse, 1.53 times as wide as long; apical half of the antennal scape covered by narrow scales and setae; the 1st funicular segment slightly longer than the 2nd; setae on the elytral interstriae are narrower, about 2.5–3.35 times as long as wide. Trachyphloeoides belousovi sp. n. is similar to T. reuteri sp. n. in the shape of elytra, covered by semierected and long setae, differs from it in the following features: rostrum at the level of antennal insertion 1.21 times as width as the length of the antennal scape; apical margin of elytra angularly curved at middle; surface of the abdominal ventrites 3 and 4 looks like transversal carina, ventrite 5 rounded at apex; scales on elytra flattened, lanceolate, with hair-shaped apex; penis noticeably narrowed apically, smoothly dorsoventrally curved, its lamella moderately narrowly rounded and slightly blunted in the middle; armament of the endophallus not projects beyond apex of penis. Trachyphloeoides reuteri sp. n. has the rostrum at the level of the antennal insertion 1.37 times as wide as the antennal scape length; apical margin of elytra broadly rounded; abdominal ventrites 3 and 4 smoothly convex, ventrite 5 almost straightly truncate at apex; elytral scales usually with equal length and width or barely elongate, slightly pointed or broadly incised at apex; penis almost parallel sided, at middle part somewhat compressed from sides, strongly curved dorsoventrally, apex of lamella broadly blunted and emarginated; armament of endophallus distinctly projects beyond apex of penis in the shape of semitransparent plate. Trachyphloeoides hartmanni sp. n. is similar to T. io and T. shokhini sp. n. in oviform elytra. It differs from both species in the following features: eyes strongly convex; apical part of 5th elytral interstria distinctly elevated with tubercle at apex; penis gradually narrowed apicad, 3.3 times as long as wide. Trachyphloeoides shokhini sp. n. differs from T. io in the following features: inner side of hind tibiae with distinct sharpened granules; 1st protarsomere transverse, 2nd one strongly transverse, 2.42 times as wide as long, 3rd protarsomere 1.26 times as wide as protibial apex; penis narrower, 3 times as long as wide, at middle part distinctly compressed from sides; armament of the endophallus with two long sclerotized rods, slightly projecting from basal margin of the penis. Trachyphloeoides kabaki sp. n. easily differs from all congeners in the following features: eyes almost hemispherical, rather strongly projected beyond of the head contour; rostrum usually distinctly narrowed apicad; elytra smoothly compressed from sides behind humeri; 2nd–5th of elytral interstriae with tubercles at the apical part distinctly projecting beyond the body contour. A key to eight species of the genus Trachyphloeoides is given.

Keywords

• trachyphloeoides
• new taxa
• china
• identification key