Tetraserica bansanpakiana, 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 : 60

Tetraserica bansanpakiana sp. n. Figures 25, 47

Type material examined.

Holotype: ♂ "NW Thailand, 25.iv-7.v.1996, Chiang Mai prov., BAN SAN PAKIA Sv. Bílý leg., 1700 m/ coll. P. Pacholátko / 131 Sericini Asia spec." (CPPB). Paratypes: 1 ♂ "Thai-N, 1.-19.5.1998, Chiang Mai prov., BAN SAN PAKIA, Bednařik leg., 1400 m/ coll. P. Pacholátko” (ZFMK), 1 ♂ "Thai-N 1-15.v.1998, Chiang Mai prov., 19°19'N, 98°50'E, SAN PAKIA, 1400 m, Vít Kubáň leg./ coll. P. Pacholátko / 125 Sericini Asia spec." (CPPB), 2 ♂♂ "Thai, 17.-24.V.1991, Chiang Dao, 1000 m, 19°25'N, 98°52'E, Vit Kubaň leg./ Thailand "Thanon Thong Chai" D. Král & V. Kubáň” (ZFMK), 3 ♂♂, 3 ♀♀ "Thailand 17.-24.V.1991 Chiang Dao 1000m 98°52'E, 19°25'N, V. Kuban lg." (ZFMK), 1 ♂, 2 ♀♀ "Thailand 10.-16.V.1991 Chiang Dao 600 m 19°24'N, 98°55'E, V. Kuban lg." (ZFMK), 3 ♂♂, 5 ♀♀ "Thailand 9.-14.V.1991 Chiang Dao 350 m 19°22'N, 98°57'E, V. Kuban lg." (ZFMK), 3 ♂♂, 1 ♀ "Thailand bor. Chiang Dao env. 21.5.-4.6.1995, lgt. Snizek M." (ZFMK), 1 ♀ "Thailand bor. Chiang Mai, 56 km NW, 99°25', 19°05', 7-14.6.1995, lgt. Snizek M." (ZFMK), 3 ♂♂ "Thai 17-24/5.91 Chiang Dao mts. 19.25'N, 98.52E, lgt. D. Kral, 1000 m" (NMPC), 1 ♂ "839467 Tetraserica spTHAI_DE09_1 Thailand L. Dembicky 9.-13.5.2009 Doi Chiang Dao env. Chiang Mai Prov. 19°24'45"N, 98°51'30"E, 1200 m" (ZFMK).

Description.

Length of body: 6.9 mm; length of elytra: 4.6 mm; maximum width: 4.1 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: 0.41. Ratio of length of metepisternum/metacoxa: 1/1.6. Metatibia short and wide, ratio width/length: 1/3.2; basal group of dorsal spines of metatibia at first third of metatibial length. Robust spine at middle of ventral margin extremely prolonged and s-shaped, exceeding distal margin of metatibia.

Aedeagus: Fig. 25 A–C. Habitus: Fig. 25D.

Variation.

Length of body: 6.9-8.5 mm; length of elytra: 4.6-5.9 mm; maximum width: 4.1-5.1 mm. Colour may vary from dark brown to nearly entirely yellowish brown with dark head. Female: Antennal club with three antennomeres, as long as remaining antennomeres combined; eyes as large as in male; pygidium flat; robust spines on ventral margin of metatibia subequal in length.

Diagnosis.

The new species differs from all other Tetraserica species by the robust metatibial spine in middle of ventral margin being extremely elongate and s-shaped, exceeding distal margin of metatibia.

Etymology.

The new species is named after the type locality, Ban San Pakia (adjective in the nominative singular).