Bolitogyrus taiwanensis (Hayashi, 1991)

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 48-49

Bolitogyrus taiwanensis (Hayashi, 1991) Figs 6A, E, 15 G–I, 21D (map)

Cyrtothorax taiwanensis Hayashi, 1991: 45.

Bolitogyrus taiwanensis : Smetana 1995.

Type locality.

Taitung, Taitung County, Taiwan.

Type material.

Cyrtothorax taiwanensis Hayashi, 1991.

Paratype (♀, cHay): Formosa [=Taiwan], Taitung [Taitung County], Taitung city [from description], 19.VI.1972, Y. Kiyoyama, AJB0000434.

Other material.

Taiwan: Pingtung: Tahanshan Logging Road, 22.410 120.737, 24.X.2015, D. Huang (photo record); same except, 7.IV.2013, L. Wei-Ren (photo record, in copula).

Diagnosis.

This species may be recognized by the following: head entirely dark; pronotum widest in posterior third; elytra partly dark, with broadly pale basal area composed of yellow raised marking and slightly darker non-raised area (Fig. 6A); antennomere 7 only slightly transverse (Fig. 6E); female tergite X with disc flattened.

Redescription.

Measurements ♀ (n = 1): HW/HL 1.34; PW/PL 1.36; EW/ EL 1.22; ESut/PL 0.84; PW/HW 1.06; forebody length 5.0 mm.

Similar to B. vulneratus and differing only in the following: elytra with broad basal area composed of raised yellow marking and non-raised, slightly darker area; hind femur with dark apical marking larger, extending onto the very base of hind tibia; head less transverse; pronotum more transverse, with more numerous micropunctures; antennomere 6 quadrate, 7 slightly and 8-10 transverse; suture of elytra relatively longer than pronotum at middle; forebody slightly longer; median lobe and paramere in lateral view each with small expansion (Fig. 15H); [male characters based on illustrations in the literature] median lobe in parameral view widened in apical fourth and then strongly narrowed to acuminate apex (Fig. 15G); paramere at widest point, slightly wider than median lobe, slightly to distinctly longer than median lobe, with longer, distinctly acuminate apical portion (Fig. 15G); peg setae arranged in clear medial and marginal groups, medial group extended basad of marginal group (Fig. 15I); male sternite VIII emargination very slight; female tergite VIII with narrower emargination, moderately deep U-shaped; female tergite X with disc entirely flattened, apical projection distinctly longer than wide.

Distribution.

Figure 21D. Distributed in the southern part of Taiwan, on the eastern side of the major mountain system. More records are needed to discern how widespread this species is; currently it is not sympatric with B. rufomaculatus .

Bionomics.

This species has been observed in April-July and October at an approximate elevation of 1200 m. One pair was found in copula in October.

Comments.

The photo records of this species by D. Huang and L. Wei-Ren represent the only detailed data available as the type series is only reported from the general area of Taitung city. Bolitogyrus taiwanensis is most similar to allopatric B. fukiensis (eastern mainland China) but can be distinguished by the dark band on the hind femur and by the less transverse antennae. Females can be easily be distinguished by their flattened disc of tergite X (versus raised in B. fukiensis ).