Strumigenys formosensis Forel (Figs. 3, 9)

Strumigenys feae var. formosensis Forel, 1912. Entomol. Mitt. 1: 52.

Strumigenys formosensis Forel: Brown, 1949. Mushi 20: 19, 24.

Material examined: ILAN HSIEN: Fushan, 1 female, 8 workers, 10.X.1992, CCL: 16 workers, 10.X.1992, CCL; 1 fema- le, 47 workers, 10.X.1992, CCL. KEELU- NG CITY: Paomingsu, 1 worker, 16.VI. 1992. CCL. NANTOU HSIEN: Hui- sunlinchang. 3 females, 49 workers, 13.XII.1992. CCL; 5 workers, 14.XII.1992, CCL: 1 female, 20 workers, 14.XII.1992, CCL: 2 female, 75 workers. 14.XII.1992, CCL; 4 workers, 21.VI.1993, CCL; Lie- nhuachih, 11 workers, 13.XI.1992, CCL; Lushan, 2 workers, 17.X.1993, CCL. PI- NTUNG HSIEN: Renting. 1 female, 80 workers, 25.IV.1992, CCL: 1 female. 75 workers, 25.IV.1992, CCL; 1 female, 98 workers. 25.IV. 1992, CCL; 1 female. 57 workers, 26.IV.1992. CCL: 1 female, 10 workers, 26.IV.1992, CCL. TAIPEI CITY: Shuangchi. 1 female. 24 workers, 4.VI.1988, CCL: TAIPEI HSIEN: Hsintien, 8 workers. 11.VI.1992, CCL; 15 workers. 13.VI.1992, CCL: 1 female. 1.X.1992. CCL: Wulai, 1 female. 22 workers, 2.X.1992, CCL. TAITUNG HSIEN: Chihpen, 6 workers, 5. XI. 1994. CCL.

Distribution: Taiwan.

Remarks: This species is easily distinguished from the other Taiwanese congeners by the following combination of characters: (1) mandible sickle-like at extreme apex; (2) anterior border of clypeus deeply concave medially (Fig. 3); (3) cranium with numerous, short, broad spatulate hairs (Fig. 3). It is a pleistoendemic species of the genus in Taiwan, and widely distributed in the low-middle elevation zone of the island.