Agetocera taiwana Chûjô, 1962

Agetocera taiwana Chûjô, 1962: 59; Kimoto, 1969: 31 (part); Gressitt & Kimoto, 1963: 495 (key); Wilcox, 1971: 260 (catalogue); Kimoto, 1989: 249 (part); Takizawa et. al., 1995: 8 (part); Kimoto & Chu, 1996: 63 (catalogue); Kimoto & Takizawa, 1997: 303 (key), 377.

Male. Length 9.6–10.4 mm, width 4.7– 4.8 mm. Antennomeres (Fig. 11) IX–XI black, antennomere II shortest, antennomeres III and IV subequal in length and longer than II, antennomeres V–VII subequal in length, longer than II and slightly shorter than III and IV, apically widened, antennomere VIII strongly swollen, with a sharp process at anterior-lateral angle, antennomere IX (Fig. 16) strongly flattened dorsally, most of dorsal surface glabrous, antennomere X subequal to IX, antennomere XI longest, about 1.3 times as long as X. Genitalia (Fig. 31) with median process bent ventrally, flattened dorso-ventrally, with a prominent, longitudinal, median ridge at ventral surface; lateral processes short and wide; endophallus with lateral spiculae long and recurved apically.

Female. Antenna (Fig. 12) filiform, antennomeres IX–XI black, relative length of antennomeres II–XI about 1.0: 1.6: 1.6: 1.5: 1.5: 1.5: 2.4: 2.4: 2.8: 4.3.

Diagnosis. This species can be distinguished from other members of the Agetocera taiwana species group by its yellowish-brown antennomere VIII, more flattened antennomere VIII in the male, and narrow antennomere VIII in the female. The male genitalia of A. taiwana is similar to A. huatungensis with the dorsoventrally flattened median process, but differs by its narrower lateral processes, the prominent dorsal ridge on the median process, and the ventrally bent median process.

Type material (5 specimens). Holotype 3: “ Holotype (red, faded and invisible) / Arisan (= Alishan, Chiayi), FORMOSA 24–25.V.1933 Col. M. CHUJO / Agetocera taiwana Chûjô DET. M. CHUJO / 2310” (TARI); allotype (gray; 2311) and two paratypes 33 (green; 2600, 2601), with same data as holotype (TARI); one paratype Ƥ (green): “Mt. Arisan FORMOSA 10.VI.1940 COL. M. CHUJO / Agetocera taiwana Chûjô DET. M. CHUJO / 2603”.

Other material examined (8 specimens). 13 (#11731), 1Ƥ (#11729), Kaoshiung, Taoyuan, 01.VII.2009, leg. M.-H. Tsou; 13, same locality, 30.V.2009, leg. Uika Ong; 233, 1Ƥ, Chiayi, Alishan, 20–24.VI.1956, leg. K. S. Lin; 13, same locality, 20–23.VI.1956, leg. S. C. Chiu; 13, Arisan (= Alishan), VI.1914, leg. M. Maki (all in TARI).

Distribution. Taiwan (Chiayi: Alishan; Kaoshiung: Taoyuan).