Tetraserica paratonkinensis, 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 : 45

Tetraserica paratonkinensis sp. n. Figures 16, 50

Type material examined.

Holotype: ♂ "Coll. I. R. Sc. N. B. Vietnam, Hoang Lien N.P. 22°21'00"N, 103°46'20"E, 1-5.vii.2013 night collecting Leg. J. Constant & J. Bresseel, I.G.: 32.454/ 234 Sericini Asia spec." (ISNB). Paratype: 1 ♂ "N Vietnam, (Tonkin) pr. Vinh Phu 1990 Tam Dao, 6-9.v. P. Pacholátko leg./ coll. P. Pacholátko / VS80" (CPPB), 1 ♂ "Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearin 31°, Sa Pa vill. Env. Hoang Lien Son Nat. Res., 27.5.-3.6.1998 1250 m leg. A. Naplolov" (CNAR).

Description.

Length of body: 9.5 mm; length of elytra: 7.4 mm; maximum width: 6.3 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: 0.63. Ratio of length of metepisternum/metacoxa: 1/1.47. Metatibia moderately long and wide, ratio width/length: 1/3.69; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 16 J–M. Habitus: Fig. 16N.

Female unknown.

Variation.

Length of body: 9.5-10.2 mm; length of elytra: 7.1-7.4 mm; maximum width: 5.8-6.3 mm.

Diagnosis.

Tetraserica paratonkinensis sp. n. is very similar to T. xichouensis Liu et al., 2014 in shape of aedeagus, but differs by the left paramere being nearly uniformly curved and the median lamina of phallobase that is not narrowed in its apical half.

Etymology.

The species name (adjective in the nominative singular) is derived from the combined Greek word para- (close to) and the species name tonkinensis, with reference to the similarity with T. tonkinensis (Moser).