Diagnosis. Very similar to Lycostomus ferrugineus; it differs in the shape of epicranium (figures 7, 11) coloration of the dorsum, the more tuberculate pleural region of thoracic and abdominal sclerites, the spiracles T2 located on more protracted tubercles and the corresponding tubercles on pleurite T3 more apparent. Slight differences were found in degree of the longitudinal separation of tergite T1, the shape of abdominal sternites and in the transverse separation of lower pleurite.

Measurements. BL 14.7 mm, PL 2.55 mm, PW 2.65 mm.

Material examined. Taiwan, Nantou Hsien, Nanshanchi, 13.v. 1975, 800 m, K. Matsuda leg. (KMTC, LMBC), two mature larvae; same data, vii.1975, 24 larvae of different stages, eight pupae, five adults (KMTC); Taiwan, Nantou Hsien, Lushan Hot Springs, 1200 m, 10.v.1975, K. Matsuda lgt., two mature larvae, reared in laboratory, pupated 26–27.vii.1975, two males emerged on 7.viii.1975 (KMTC).

Remark. The junior author collected larvae of different stages and two pupae on the surface of decaying logs of Quercus sp. and Castanopsis sp., used for growing of edible fungi, and on Lentinus edodes Sing. in Nanschachi in July. Further pupae were attached to the surface of Banbusa sp. laying on the ground.