Tetraserica veliformis, 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 : 89-91

Tetraserica veliformis sp. n. Figures 39, 53

Type material examined.

Holotype: ♂ "W Thailand, Sai Yok, Kanchanaburi, Srinakarinda; 300m; 25.-27.IV.1996; leg. S. Ohmomo" (ZFMK). Paratypes: 11 ♂♂ "W Thailand, Sai Yok, Kanchanaburi, Srinakarinda; 300 m; 25.-27.IV.1996; leg. S. Ohmomo" (ZFMK), 9 ♂♂ "W-Thailand: Pu Nam Long, Hot Spring, 100 km NW of Kanchaburi; 06.-8.V.1993 leg. T. Itoh " (ZFMK), 1 ♂ "Thailand 3.-7.IV.1991 Kanchanaburi 150 m 14°02'N, 99°31'E, Vit Kuban leg." (ZFMK), 2 ♂♂ "Laos, Salavan prov., ca.16 Km NW Salavan (at light) boroken bridfge over SE DON river 15°47.4'N, 106°17.5'E, 150 m, Jiri Hájek leg. 15.V.2010" (NMPC, ZFMK), 1 ♂ "THAI 26.IV.-6.V.1991 UMPHANG 500m 16°04'N, 98°53'E, Vít Kubáň leg./ Thailand 91 "Thanon Tong Cha" D. Král & V. Kubáň / coll. P. Pacholátko” (CPPB), 1 ♂ "THAI, 9.-13.IV.1991 THIMONGHTA 350 m 15 02'N, 98 35'E, P. Pacholátko leg./ coll. P. Pacholátko / 149 Sericini Asia spec." (ZFMK), 2 ♂♂ "Coll. I. R. Sc. N. B., Thailand, Kanchanaburi prov., Sai Yok N.P. 4-5.VI.2003 Leg. J. Constant & K. Smets" (ISNB, ZFMK), 2 ♂♂, 3 ♀♀ "W-Thailand: Khao Laem Dam, 15°10'N, 99°00'E; 130 km NNW of Kanchaburi; 7.V.1993 alt. Ca. 300 m; T. Itoh leg." (ZFMK), 1 ♂ "Thailand occ. 08.-12.04.1991 Sangkhlaburi Jan Farkac leg." (NHMB).

Description.

Length of body: 9.6 mm; length of elytra: 7.6 mm; maximum width: 6 mm. 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: 0.48. Ratio of length of metepisternum/metacoxa: 1/1.79. Metatibia short and wide, ratio width/length: 1/2.95; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 39 E–H. Habitus: Fig. 39I.

Variation.

Length of body: 8.8-10.1 mm; length of elytra: 6.6-7.7 mm; maximum width: 5.9-6.1 mm. Female: Eyes as large as in male; antennal club composed of three antennomeres, club as long as remaining antennomeres combined; pygidium flat.

Diagnosis.

Tetraserica veliformis sp. n. differs from all other Tetraserica species in having a straight or convex posterior margin of metafemur and by the left paramere having a large triangular dorsomedian extension.

Etymology.

The name of the new species (noun in apposition) is derived from the combined Latin words velum (sail) and formis (in shape), with reference to the large triangle-shaped tooth of the left paramere.