Celaenorrhinus taiwanus Matsumura, 1919 stat. rev.

Figs. 5–6, 35–40

Celaenorrhinus taiwanus Matsumura, 1919: 686, pl. L, fig. 22 (Type locality: Taiwan). Celaenorrhinus maculosa taiwanus: Evans, 1949: 93 .

Celaenorrhinus maculosus taiwanus: Shirôzu, 1960: 383; Chou, 1994: 703; Hsu et al, 2006: 326.

Diagnosis. Forewing length 24 mm. Wings brown. Forewing upperside with subapical spots in R4 smaller than spots in space R3 and R5, latter two spots equal in size; cell spot and spot in space CuA1 overlapped; spot in space M3 is smaller than that in CuA2; two spots in CuA2 almost rounded, lower spot slightly larger; forewing underside basal striping much reduced and faint. Hindwing upperside with the spot in space Rs small and faint.

Male genitalia (Figs. 35–40). Gnathos well developed, densely covered with spines; valva nearly rectangular, dorso-distal part of valva narrow and small bifid; aedeagus robust; cornuti well developed and curved; juxta deeply quadrifurcated and branches equal.

Material examined. 2♂, Puli, Nantou County, Taiwan, VII-1974, Igarashi Suguru; 1♂, Qingquan, Xinzhu County, Taiwan, 10-VII-1991, Igarashi Suguru; 1♂, Taipingshan, Taiwan, 27–30-VIII-1926, Kato Masayo; 1♂, Jiayi County, Taiwan, 10-VIII-1925, Kato Masayo; 1♂, Xinzhu County, Taiwan, 30-VI-1988, Ra [Luo].

Distribution (Fig. 68). China (Taiwan).

Remarks. Matsumura (1919) described taiwanus as a distinct species. Evans (1949) treated it as a subspecies of C. maculosus, and the subsequent authors have followed the treatment (Shirôzu, 1960; Chou, 1994; Hsu et al., 2006). We examined 6 specimens, as well as referring to Shirôzu, 1960, fig. 419, pl. 905–907. Its wing patterns and male genitalia are rather constant, and show that it and the so-called nominate subspecies are significantly prominent in the following characteristics: forewing underside, basal striping much reduced in taiwanus (very developed in maculosus); cell spot and spot in space CuA1 overlapped in taiwanus (separated in maculosus); hindwing upperside with spot in space Rs small and faint in taiwanus (large and distinct in maculosus); valva with distal end vertical, narrow and small U-shaped at the tip in taiwanus (distal end oblique, shallowly V-shaped at the tip in maculosus); juxta branches equal in length, with lined mid-basal ridge in taiwanus (lateral branches less than 1/2 length of two middle branches, spherical mid-basal process in maculosus). So, we agree with Matsumura that it is a good species.