Tetraserica spinotibialis, Fabrizi, Silvia, Dalstein, Vivian & Ahrens, Dirk, 2019

Fabrizi, Silvia, Dalstein, Vivian & Ahrens, Dirk, 2019, A monograph on the genus Tetraserica from the Indochinese region (Coleoptera, Scarabaeidae, Sericini), ZooKeys 837, pp. 1-155 : 50

Tetraserica spinotibialis sp. n. Figures 19, 56

Type material examined.

Holotype: ♂ "NW Thailand, 9-16.V. MAE HONG SON. 1991 Ban Huai Po 1600 m leg. P. Pacholátko / coll. P. Pacholátko / 918 Sericini Asia spec." (CPPB). Paratypes: 1 ♂ "NW Thailand, 1-8.V. MAE HONG SON 1992 BAN SI LANG 1200 m J. HORAK LEG./ coll. P. Pacholátko” (ZFMK), 4 ♂♂ "NW Thailand, 19.19N, 97.59E Mae Hong Song, 1991 Ban Huai Po, 1600-2000 m 17.-23.5., L. Dembicky leg." (NHMW, ZFMK), 2 ♂♂ "NW Thailand, 19.19N, 97.59E Mae Hong Song, 1991 Ban Si Lang, 1200 m 23.-31.5., L. Dembicky leg." (NHMW), 1 ♂ "N-Thailand Ban Mai [Huai] Po 9.-16.5.1991 L. Horak lgt./ Coll. Milan Nikodym Praha" (ZFMK), 3 ♂♂, 1 ♀ "Birmania Lashio VI-53 Bentoglio" (MSNM).

Description.

Length of body: 9 mm; length of elytra: 5.8 mm; maximum width: 5.8 mm. Surface of labroclypeus and disc of frons glabrous. Smooth area anterior to eye twice as wide as long. Eyes moderately large, ratio of diameter/interocular width: 0.71. Ratio of length of metepisternum/metacoxa: 1/1.72. Metatibia short and wide, ratio width/length: 1/2.05; basal group of dorsal spines of metatibia at first third of metatibial length. Ventral terminal spine of metatibia distinctly longer than first metatarsomere.

Aedeagus: Fig. 19 I–K. Habitus: Fig. 19L.

Variation.

Length of body: 9.0-9.9 mm; length of elytra: 5.8-7.0 mm; maximum width: 5.5-5.8 mm. Female: Eyes as large as in male; antennal club composed of three antennomeres, as long as remaining antennomeres combined.

Diagnosis.

Aedeagus of Tetraserica spinotibialis sp. n. resembles that of T. ruiliensis Liu et al., 2014 in shape. The new species differs by the ventral terminal spine of metatibia being distinctly longer than first metatarsomere, as well as by the right paramere being more strongly bent in the middle in lateral view.

Etymology.

The species name (adjective in the nominative singular) is derived from the combined Latin words spina and tibialis, with reference to the strongly developed spine of the mesotibia.