Tetraserica falciforceps, 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 : 37-38

Tetraserica falciforceps sp. n. Figures 13, 48

Type material examined.

Holotype: ♂ "NE-Laos: Houa Phan prov.; Ban Saleui, Phou Pan (Mt.)- 20°12'N, 104°01'E, 11.iv.-15.v. 2012, 1300-1900 m leg. C. Holzschuh - ZFMK Ankauf 2012/ sp 37 Silvia Indochina" (ZFMK). Paratypes: 2 ♂♂, 2 ♀♀ "NE-Laos: Houa Phan prov.; Ban Saleui, Phou Pan (Mt.)- 20°12'N, 104°01'E, 11.iv.-15.v. 2012, 1300-1900 m leg. C. Holzschuh - ZFMK Ankauf 2012 " (ZFMK), 1 ♂ "NE-Laos: Houa Phan prov.; Ban Saleui, Phou Pan (Mt.)- 20°12'N, 104°01'E, 1300-1900 m 01.-31.5.2011, leg. C. Holzschuh - ZFMK Ankauf 2012" (ZFMK), 4 ♂♂ "C. Vietnam: Thanhhoa prov., Langchan, 300 m, 17.-18.IV.1963, leg. O. Kabakov" (ZIN, ZFMK), 1 ♂ "N Vietnam 1986 prov. Ha son binh Hoa Binh 5.-7.7. V. Shliva lgt." (NHMB).

Description.

Length of body: 6.9 mm; length of elytra: 5.1 mm; maximum width: 4.5 mm. Dorsal surface blackish, ventral surface reddish brown. Surface of labroclypeus and disc of frons glabrous. Smooth area anterior to eye twice as wide as long. Eyes small, ratio of diameter/interocular width: 0.44. Ratio of length of metepisternum/metacoxa: 1/1.44. Metatibia moderately long and wide, ratio width/length: 1/3.8; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 13 A–C. Habitus: Fig. 13D.

Variation.

Length of body: 6.9-7.5 mm; length of elytra: 5.1-5.9 mm; maximum width: 4.5-5.2 mm. Female: Eyes as large as in male; antennal club composed of three joints, short, as long as remaining antennomeres combined.

Diagnosis.

Tetraserica falciforceps sp. n. is rather similar to T. sigulianshanica Liu et al., 2014 in shape of the aedeagus; the new species differs by the straight left paramere not being widened at apex and by the longer and widely arched dorsal lobe of the right paramere.

Etymology.

The species name (noun in apposition) is derived from the combined Latin words falcis (sickle) and forceps, with reference to setae present to the sickle-shaped right paramere.