Notes on the genus Apteroloma of China with description of a new species (Coleoptera, Agyrtidae)

Abstract A new species, Apteroloma zhejiangense sp. n., is described from Zhejiang Province, China. The habitus and sexual characters of the new species are illustrated. Apteroloma jinfo Růžička, is reported for the first time from China: Hubei and Hunan Provinces, and Apteroloma potanini (Semenov, 1893) from Ningxia and Henan Provinces. Presence of Apteroloma kozlovi Semenov-Tian-Shanskij & Znojko in Semenov-Tian-Shanskij, 1932 in South Korea is confirmed based on re-examined material.


Introduction
Apteroloma Hatch, 1927 is a large genus of Agyrtidae with 29 species in the world and 8 species in China. The Chinese species of the genus were recently revised by Růžička et al. (2004) and Růžička and Pütz (2009).
In this paper, a new species from Zhejiang Province is described which considerably expands the distribution of the genus to East China. New province records of several Apteroloma species from China are provided and A. kozlovi from South Korea is confirmed based on re-examined material.

Material and methods
For examination of genitalia, the last two male abdominal segments and last female abdominal segment were detached from the body after softening in hot water. The aedeagus together with other dissected pieces were mounted in Euparal (Chroma Geselschaft Schmidt, Koengen, Germany) on plastic slides. Photos of sexual characters were taken with Canon G7 attached to Olympus SZX 16 stereomicroscope; habitus photos were taken with a Canon macro photo lens MP-E 65mm attached to Canon EOS40D camera.   Description. Measurements of the male holotype: TBL=7.3 mm, PMW/ PML=1.49, PMW/PBW 1.19, EL/EW 1.33, EW/PMW 1.53.
Body large, 6.7-7.7 mm in length; dorsum in mature specimens dark brown; antennae, mouthparts, lateral portion of pronotum and legs uniformly ferruginous; dorsal surface shiny, with fine transverse microsculpture (pronotum discally with nearly isodiametric microsculpture); pronotum and elytra with scattered short erect setation; each mandible with two large acute teeth on inner edge before apex.
Etymology. Adjective; named after Zhejiang Province, where the new species was discovered.
Distribution. China (Zhejiang) (Fig. 13). So far known only from the type locality. Bionomics. All specimens of the new species were collected by sifting leaf litters in broad-leaved forest, at altitudes 300-1200 m.
Variation. Aedeagus has distinctly triangular, sub-sinuate apex in dorsal view in specimens from the type locality (Růžička et al. 2004: 117, Fig . 3), and straight apex with narrower tip in dorsal view in males from Hubei and Hunan Provinces (Fig. 11). Posterior margin of female ventrite VIII in specimens of Hubei Province is regularly rounded (Fig. 12), not distinctly truncate as observed in specimens from the type locality (Růžička et al. 2004: 117, Fig . 10). However, we consider variability of both characters to fall within variability range of the same species.