from China, Japan, and Corea. 323 



In one example of the male the ground-colour is decidedly 

 grejish. 



Var. parva, nov. 



Much smaller than the type ; the inner line of primaries is 

 less acutely angled below costa, and the outer line rather more 

 sharply angled. The male has the pectination of antennas 

 shorter, and is without brown or ochreous in the composition 

 of its colouring and agrees almost exactly with the female, 

 which is typical except as regards the minor points of difference 

 referred to. 



Expanse, $ 56, ? 64 millim. 



One male specimen from Pu-tsu-fong, one female from 

 Che-tou, and another from Ta-chien-lu : July. 



Distribution. Japan; Western China. 



Biston regalis. 



Amphidasys regalis, Moore, Lep. Atk. p. 234 (1887). 



Biston reyaliS) Hampson, Fauna Brit. Ind., Moths, iii. p. 245 (1895)^ 



One male specimen from Tchang taken in June. 



There is an example from Hakodate in the National Col- 

 lection, and this, like the specimen from Central China 

 referred to above, has the basal, medial, and apical areas 

 whiter than in the Indian form. 



Distribution. N.W. Himalayas ; Kha*sis (Hampson) ; 

 Yesso; Central China. 



Biston tendinosaria. 



Amphidasys tendinosaria, Brem. Lep. Ost-Sib. p. 73, pi. vi. fig. 17 



(1864). 

 Phthonosema tendinosai'ia, Warr. Novit. Zool. i. p. 428 (1894). 



There were specimens from Yokohama, Oiwake, Nikko, and 

 Yesso in Fryer's collection. 



I took the species at Gensan in June and at Fushiki in 

 July, and it has also been obtained at Tokio. 



Distribution. Amur; Corea; Japan; Yesso. 



[Biston fasciaria, Motsch. Bull. Mosc. xxxix. p. 197. 

 I am unable to identify this species.] 



Biston serratilinearia, sp. n. 



Whitish brown, powdered with grey. Basal area of pri- 

 maries rusty brown, bordered with darker ; outer line black, 

 serrated, followed by a diffuse rusty-brown band; sub- 

 marginal line of the ground-colour; discal spot blackish, with 



