Scaurus viennensis J. Sturm, 1807.

Holotype ♂ (MHBU): China, Xizang, Gyaca Coun., Lasui [29.0649°N, 92.4656°E], 3500 m, 29 June 2009, G. D. Ren leg.

Named after the shape of the pronotum.

The new species shares with Laena yasuakii Masumoto, 1996 from Yunnan having the profemora with tooth, but it can be separated mainly by the shape of the pronotum and aedeagus, protibiae with a parallel-sided broadened anterior part.

Male. Eyes (Fig. 1) elliptical, moderately prominent. Antennae (Fig. 7) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 5.5 (4.9): 10.0 (4.8): 7.1 (5.5): 7.9 (6.5): 7.1 (6.0): 7.3 (5.9): 7.3 (6.1): 8.0 (7.5): 8.5 (8.3): 12.5 (9.1).

Pronotum (Fig. 1) nearly quadrate, 1.2 times as wide as long, widest at middle; disc with large punctures, punctures medially somewhat sparser than laterally, their distance 1–4 times as long as puncture diameter, most punctures with long and erect setae, surface flat and shining, lateral margins weakly bordered, basal margin unbordered and not bent downwards, posterior angles rounded; propleura with smaller and sparser punctures and shorter setae than those of disc.

Elytra (Fig. 1) nearly parallel-sided from base to middle, 1.9 times as long as wide, widest at middle; punctural rows without striae, punctures as large as those of pronotum, each puncture with long and erect seta, intervals with regular row of small punctures each bearing a similar seta, all intervals flat and shagreened, interval IX with 4 indistinct setiferous umbilicate pores, interval VII without them.

Anterior femur (Fig. 8) with tooth, other femora (Figs. 9–10) unarmed. Anterior tibiae with parallel-sided broadened anterior part.

Last abdominal ventrite (Fig. 11) rounded at apex. Aedeagus see Figs. 12–14.

Female: unkown.

Body length: 4.5 mm.

Holotype ♂ (MHUB): China, Xizang, Môdog Coun., Nage-Dayan dong, 2900–3300 m, 12 August 2005, L. Tang leg.

Paratype: 1♂ (MHUB): labelled as the holotype; 1♂, (MHUB): China, Xizang, Môdog Coun., Hanmi, 2200 m, 23–27 August 2005, L. Tang leg; 1♂ (SMNS): China, Xizang, Môdog Coun., Nage, 3000–3500 m, 11 August 2005, L. Tang leg.

Named after the type locality.

The new species is similar to Laena hingstoni Schuster, 1926, both from Xizang, by similar body shape, but can be separated by the smaller body size, the completely unbordered lateral margin of the pronotum, and flat elytral intervals.

Male. Eyes (Fig. 2) rounded, moderately prominent. Antennae (Fig. 15) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 7.0 (4.8): 10.8 (5.0): 7.5 (5.3): 8.0 (5.5): 10.0 (5.4): 8.9 (6.3): 9.5 (6.8): 10.0 (7.0): 10.0 (8.0): 14.9 (8.2).

Pronotum (Fig. 2) cordiform, basal margin distinctly narrower than anterior margin, 1.2 times as wide as long, widest just behind anterior margin; disc scattered with some punctures, their distance 2–5 times as long as puncture diameter, all punctures with setae slightly varying in length, surface flat and shining, lateral margins unbordered, basal margin unbordered and not bent downwards, posterior angles rounded; propleura with smaller punctures and shorter setae than those of disc.

Elytra (Fig. 2) oblong ovate, 1.7 times as long as wide, widest at middle; punctural rows without striae, punctures as large as those on pronotum and each bearing a seta, intervals with very fine punctures, each bearing a seta longer than those of punctures of rows, all intervals flat and shining, interval IX with 3 setiferous umbilicate pores.

All femora (Figs. 16–18) without teeth. All tibiae (Figs. 16–18) normal.

Last abdominal ventrite (Fig. 19) triangular at apex. Aedeagus see Figs. 20–22.

Female: unkown.

Body length: 4.3–5.0 mm.

Holotype ♂ (MHBU): China, Yunnan Province, Bababhe. N. R. Bengganghan, 1930 m, 14 November 2008, J. Y. Hu & L. Tang leg.

Paratype: 1♂ (SMNS): labelled as the holotype; 1♀ (SMNS), 1♀(MHBU): China, Yunnan, Bababhe, Dianshita, 1900 m, 30 June 2005, LI & LI leg; 1♀ (MHUB): China, Yunnan, Bababhe. N. R. Bengganghan [22.25833° N, 100.66361° E], 1700 m, 14 November 2008, J. Y. Hu & L. Tang leg.

Named after the green metallic shine of the body.

The new species is similar to Laena luguica Schawaller, 2001, but can be easily distinguished from it by the following characters: (1) all tibiae of male with finely hooked inner apex, especially the middle tibiae; (2) last abdominal ventrite of male denticulate at apex; (3) the shape of the aedeagus is different.

Male. Dorsal side with green metallic shine. Eyes (Fig. 3) elliptical, moderately prominent. Antennae (Fig. 23) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 5.3 (6.0): 13.3 (6.3): 10.0 (6.7): 10.3 (6.8): 10.1 (7.8): 10.2 (8.1): 10.8 (8.5): 10.0 (8.8): 12.0 (11.5): 18.3 (11.5).

Pronotum (Fig. 3) cordiform, basal margin distinctly narrower than anterior margin, 1.2 times as wide as long, widest just behind anterior margin; disc with small punctures, punctures medially somewhat sparser than laterally, their distance 2–6 times as long as puncture diameter, most punctures with long and erect setae, surface flat and shining, lateral margins bordered, basal margin bordered, feebly in middle, not bent downwards, posterior angles rounded; propleura with smaller punctures and shorter setae than those of disc.

Elytra (Fig. 3) oblong, 2.1 times as long as wide, widest at middle; punctural rows placed in indistinct striae, punctures distinctly larger than those of pronotum and each bearing a long and erect seta, intervals with regular row of small punctures each bearing a similar seta, all intervals flat and shining, interval IX with 5 setiferous umbilicate pores, interval VII in both humeral and posterior region with a setiferous pore.

All femora (Figs. 24–26) each with a strong tooth. All tibiae (Figs. 24–26) with finely hooked inner apex, especially on middle tibiae.

Last abdominal ventrite (Fig. 27) denticulate at apex. Aedeagus see Figs. 29–31.

Female: Dorsal side without green metallic shine. Last abdominal ventrite (Fig. 28) sharp at apex, not denticulate.

Body length: 6.2–7.2 mm.

Holotype ♂ (MHUB): China, Yunnan, Dali, Cangshan E slope, 3400 m, 19 August 2008, J. S. Xu leg.

Paratype: 1♀ (MHUB): labelled as the holotype.

Named after anterior tibiae of male with a medial tooth.

The new species shares with Laena schusteri Schawaller, 2001 the body shape, and the medial tooth of anterior tibia, but can be separated by the teeth of all femora, and middle and posterior tibiae of male with finely hooked inner apex.

Male. Eyes (Fig. 4) elliptical, moderately prominent. Antennae (Fig. 32) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 7.8 (10.8): 22.1 (11.5): 15.5 (12.8): 16.8 (12.0): 15.0 (13.9): 16.5 (13.9): 15.5 (13.0): 17.8 (13.1): 16.9 (14.2): 20.8 (13.9).

Pronotum (Fig. 4) elliptical, 1.3 times as wide as long, widest at middle; disc with small scattered punctures, their distance 0.5–3 times as long as puncture diameters, all punctures with short and adpressed setae, disc with a pair of feeble impressions, lateral margins narrowly bordered, basal margin unbordered, and not bent downwards, posterior angles rounded; propleura without punctures and setae.

Elytra (Fig. 4) nearly parallel-sided from base to middle, 1.9 times as long as wide, widest at middle; elytra with punctural rows of without striae, punctures distinctly larger than those of pronotum, each puncture bearing a short and adpressed seta, intervals with nearly invisible punctures, but with some similar setae, all intervals flat and shagreened, interval IX with 3 setiferous umbilicate pores.

All femora each with a tooth, but middle femur (Fig. 34) with a pair of equally sized teeth. Anterior tibia (Fig. 33) with median tooth and dilated apex, anterior and middle tibiae excavate medially and with caespitose setae, middle and posterior tibiae (Fig. 35) with finely hooked inner apex.

Last abdominal ventrite (Fig. 36) somewhat sharp at apex. Aedeagus see Figs. 38–40.

Female: Last abdominal ventrite (Fig. 37) somewhat rounded at apex. Middle femora with a pair of unequal teeth.

Body length: 8.5–9.5 mm.

Holotype ♂ (MHUB): China, Yunnan, Gongshan County, No 12 Bridge [27.72°N, 98.60°E], 2750 m, Sino-America Exped, 15 June 2000, H. B. Liang leg.

Named after Dr. LIANG Hong-Bin, who collected several new species of Laena in China.

The new species is similar to Laena kalabi Schawaller, 2008, but can be easily distinguished from it by the following characters: (1) middle tibiae of male with finely hooked inner apex; (2) anterior and middle tibiae of male medially not sinuate, posterior tibiae of male apex not dilated; (3) shape of the aedeagus is different.

Male. Eyes (Fig. 5) elliptical, weakly prominent. Antennae (Fig. 41) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 8.2 (8.5): 21.5 (8.3): 15.5 (8.5): 15.0 (10.0): 14.0 (10.1): 15.5 (11.0): 14.8 (11.0): 15.0 (11.8): 15.9 (13.0): 21.5 (14.0).

Pronotum (Fig. 5) quadrate, 1.0 times as wide as long, widest at middle; disc scattered with small punctures, their distance 1–6 times as long as puncture diameters, all punctures with setae slightly varying in length, surface nearly flat and dull, medial part of base feebly impressied, lateral margins indistinctly bordered, basal margin unbordered and not bent downwards, posterior angles rounded; propleura with larger punctures and shorter setae than those of disc.

Elytra (Fig. 5) nearly parallel-sided, 2.0 times as long as wide, widest at middle; punctural rows in indistinct striae, punctures as large as those on pronotum, and each bearing a shorter seta, intervals with very small punctures, each bearing a similar seta, all intervals flat and dull, interval IX with 3 indistinct setiferous umbilicate pores, interval VII with an indistinct setiferous pore in posterior region.

All femora (Figs. 42–44) without teeth. Middle tibiae (Fig. 43) with finely hooked inner apex, all tibiae (Figs. 42–44) with granulation from middle to apex at inner side.

Last abdominal ventrite (Fig. 45) truncate at apical margin. Aedeagus see Figs. 46–48.

Female: unkown.

Body length: 9.4 mm.

Holotype ♂ (MHUB): China, Hainan Island, Jianfengling, 25 May 2011, X. Q. Yang & L. F. Wang leg.

Paratype: 1♂ (SMNS), 1♂ (MHUB): China, Hainan Island, Jianfengling, 25 May 2011, X. Q. Yang & C. Zhang leg; 1♂, 2♀♀ (MHUB): labeled as the holotype.

Named after the massive teeth of the femora.

The new species is similar to Laena jizushana Masumoto, 1996, but can be easily distinguished from it by the following characters: (1) body with long and erect setae; (2) posterior femur of male with distinct granulation at inner side; (3) all tibiae of male with granulation at inner side and with finely hooked inner apex; (4) the shape of the aedeagus is different.

Male. Eyes (Fig. 6) rounded, prominent. Antennae (Fig. 49) extending to base of pronotum, ratio of length (width) of antennomeres II–XI as follows: 5.5 (5.5): 10.8 (6.5): 9.3 (7.5): 8.9 (7.8): 8.3 (9.0): 9.0 (8.5): 8.9 (8.5): 9.0 (8.5): 10.1 (9.8): 19.0 (11.0).

Pronotum (Fig. 6) elongate, 0.9 times as wide as long, widest just behind anterior margin, basal margin distinctly narrower than anterior margin; disc with large punctures, their distance 0.5–2 times as long as puncture diameters, all punctures with long and erect setae, basal part with feeble longitudinal impression, lateral margins indistinctly bordered, basal margin unbordered and not bent downwards, posterior angles rounded; propleura with wider punctures and shorter setae than those of disc.

Elytra (Fig. 6) oblong, 2.4 times as long as wide, widest at middle; elytra punctural rows in indistinct striae, punctures as large as those on pronotum, and each bearing a long and erect seta, intervals with a regular row of small punctures each bearing a similar seta, all intervals convex and shining, interval IX with 10 indistinct setiferous umbilicate pores, interval VII with an indistinct setiferous pore in posterior region.

All femora (Figs. 50–52) each with a strong tooth, posterior femora also with distinct granulation at inner side. All tibiae (Figs. 50–52) with granulation at inner side and with finely hooked inner apex.

Last abdominal ventrite (Fig. 53) nearly rounded at apical margin. Aedeagus see Figs. 55–57.

Females: Ventrite (Fig. 54) nearly sharp at apical margin.

Body length: 5.0–6.0 mm.