Tetraserica quadrifurcata, 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 : 34-36

Tetraserica quadrifurcata sp. n. Figures 11, 50

Type material examined.

Holotype: ♂ "Cambodia: Kirirom Nat. Park, h = 650 m, 11°18'6"N, 104°5'40"E, 9-16.XII.1999 leg. M. & S. Murzin/ coll. D. Ahrens/ 117 Sericini Asia spec." (ZFMK). Paratype: 1 ♂, 1 ♀ "Thailand, Khao Yai; at light, 15.VII.1991; leg. M. Tanida" (ZFMK).

Description.

Length of body: 8.9 mm; length of elytra: 6.8 mm; maximum width: 5.6 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: 0.62. Ratio of length of metepisternum/metacoxa: 1/1.67. Metatibia moderately long and wide, ratio width/length: 1/3.33; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 11 J–L. Habitus: 11M.

Variation.

Length of body: 8.9-9.8 mm; length of elytra: 6.8-7.0 mm; maximum width: 5.5-5.6 mm. Female: Eyes as large as in male; antennal club composed of four antennomeres, basal joint of club one quarter as long as club.

Diagnosis.

Tetraserica quadrifurcata sp. n. differs from all other Tetraserica species by its long median phallobasal apophysis having the median phallobasal lamina bifurcate at apex.

Etymology.

The species name (adjective in the nominative singular) is derived from the combined Latin prefix quadri (four) and furcata (forked), with reference to the shape of doubly bifurcate parameres.