Tetraserica umphangensis, 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 : 91-93

Tetraserica umphangensis sp. n. Figures 40, 51

Type material examined.

Holotype: ♂ "Thai 28/4 - 6/5.91 Umphang river 1000 m 16°07'N, 98°00'E, David Kral lgt./ 1015 Asia Sericini spec." (NMPC). Paratype: 1 ♂ "Thai 26/4 - 6/5.91 Umphang 500 m 16°04'N, 98°53'E, David Kral lgt." (ZFMK).

Description.

Length of body: 8.6 mm; length of elytra: 6.6 mm; maximum width: 5.3 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: 0.57. Ratio of length of metepisternum/metacoxa: 1/1.78. Metatibia short and wide, ratio width/length: 1/3.2; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 40 E–G. Habitus: Fig. 40H.

Female unknown.

Variation.

Length of body: 8.6-10.0 mm; length of elytra: 6.6-7.2 mm; maximum width: 5.3-5.8 mm.

Diagnosis.

Tetraserica umphangensis sp. n. is rather similar to T. veliformis sp. n.; T. umphangensis sp. n. differs by the right paramere being only half as long as left paramere, and the dorsal lobe of the right paramere, which is distinctly shorter than the ventral lobe. In T. veliformis the right paramere is slightly more than half as long as left paramere, and the split between lobes of the right paramere is deep, the dorsal lobe is as long as the ventral lobe.

Etymology.

The new species is named after the type locality, Umphang River (adjective in the nominative singular).