Indolinus inermis, Bordoni, 2017

Bordoni, Arnaldo, 2017, New data on the Oriental Xantholinini. 43. New species and new records from Thailand in the Naturhistorisches Museum of Basel (Coleoptera Staphylinidae) 281 ° contribution to the knowledge of the Staphylinidae, Linzer biologische Beiträge 49 (2), pp. 1219-1229 : 1224-1226

Indolinus inermis nov.sp.

( Figs 13-15 )

Examined material: Holotype ♂: Thailand, Chiang Dao, 600 m, 19.24N, 98.55E, V. Kuban 10-16.V.1991 ( NHMB); paratypes: same data, 9-14.V.1991, 1♀ ( cB); Fang , 300 m, 19.55N, 99.12E, V. Kuban 25.V.1991, 1♀ ( NHMB).

Description: Length of body 4.8 mm; from anterior margin of head to posterior margin of elytra: 2.6 mm. Body shiny, slender. Reddish brown light; antennae and legs yellowish pale. Head ovoid, narrow, slightly dilated forward, with rounded sides from the eyes to the neck, and obsolete posterior angles. Eyes medium-sized and protruding. Surface of head with very few punctures. Pronotum sub-rectangular, more or less as long as head, narrower than it, with very oblique anterior margins, obsolete anterior angles and a little sinuate sides. Surface with dorsal series of 5-6 superficial, spaced punctures and lateral series of 2 posterior punctures. Elytra sub-rectangular, not dilated posteriad, longer and wider than pronotum, with rounded humeral angles. Surface with three series of very fine punctures, one juxtasutural, one median and one lateral. Abdomen with traces of fine, transverse micro-striation and fine, very sparse punctation.

Male genital segment long and narrow ( Fig. 13 ); sternite of the same as in Fig. 14 , with 2 long setae on the lateral, posterior lobules. Aedeagus ( Fig. 15 ) 1.3 mm long, oblong, narrow, with long, peculaiar parameres; inner sac long, covered in the distal portion with two parallel series of pale scales.

Etymology: The specific epithet is the Latin inermis- e (unarmed) in relation to the few, pale scales of the inner sac.

Distribution: The species is known only from the type locality.

Remarks: When the genus Indolinus ( BORDONI, 2002) was described, the known species were only three ( I. mitomorphoides (COIFFAIT, 1984) from India, Nepal, Myanmar, Thailand and Laos, I. formosae BORDONI, 2002 from Taiwan and I. sculptilis BORDONI, 2002 from Hong Kong. Further researchs has shown that this genus is present in the Oriental Region with other species, though not common and usually represented by isolated specimens.

Also known are I. vietnamicus BORDONI, 2012 from Vietnam, I. laosianus BORDONI, 2013b from Laos and Vietnam and I. leigong BORDONI, 2013a from China (Guizou). Indolinus inermis is therefore the seventh known species of this genus.

Figures

Figs 10-15: Tergite and sternite of the male genital segment and aedeagus (10-12) of Denon silvestris nov.sp., Male genital segment, sternite of the same and aedeagus (13-15) of Indolinus inermis nov.sp. (scale bar: 0.1 mm).