Six new species of the genus Laena Dejean from China (Coleoptera, Tenebrionidae, Lagriinae)

Abstract Six new species of Laena Dejean, Laena quadrata sp. n. and Laena motogana sp. n.(China: Xizang), Laena chiloriluxa sp. n., Laena dentata sp. n. and Laena liangi sp. n. (China: Yunnan), Laena dentatocrassa sp. n. (China: Hainan Island, representing new province record of the genus) are described, complemented with photos of habitus, illustrations of legs, antenna, aedeagus and last abdominal ventrite of male and female. Type specimens are deposited in both the Museum of Hebei University, Baoding, China and the Natural History Museum of Stuttgart, Germany.A key to the 102 Chinese species of genus Laena is provided.


Introduction
Until now about 330 species of the genus Laena Dejean were described from the Palaearctic and Oriental Regions, from which about 105 species (including the six new ones described below) were found in China. Most of them were described by the following authors: Schuster (1916Schuster ( , 1940, Kaszab (1956Kaszab ( , 1970, Li and Wang (1993), Base of pronotum with distinct impression (besides other impressions), this base distinctly narrower than anterior margin with protruding anterior corners; apicale of aedeagus broad,  All tibiae of males with a few indistinct granules at the inner side, but without excavations or dilatations; body length in the average smaller (4.5-6.5 mm  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. Description. 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 pro-notum, 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.
Last abdominal ventrite (Fig. 11)   Etymology. Named after the type locality. Diagnosis. 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. 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   Etymology. Named after the green metallic shine of the body. Diagnosis. 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.
Description. Male. Dorsal side with green metallic shine. Eyes (Fig.3) elliptical, moderately prominent. Antennae (Fig. 23)  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  each with a strong tooth. All tibiae  with finely hooked inner apex, especially on middle tibiae.

Diagnosis.
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.
Description. Male. Eyes (Fig. 4)  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)  Diagnosis. 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.
Description. Male. Eyes (Fig. 5)  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  with granulation from middle to apex at inner side.
Last abdominal ventrite (Fig. 45)  Etymology. Named after the massive teeth of the femora.

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