84 A. WATSON 



Nordstroemia grisearia (Staudinger) comb. n. 



(Text-figs. 148-152) 



Drepana grisearia Staudinger, 1892 : 335. [Poor fig.] 

 Drepana grisearia Staudinger ; Strand, 191 1 : 202. [Poor fig.] 

 Drepana grisearia Staudinger ; Gaede, 1931 : 26. 



Since its description in 1892, this species has been known only from the female 

 holotype. Recently examined material from S.E. Russia and from Japan has 

 been compared with the holotype, and the male identified. 



In coloration and colour-pattern there is little difference between this species and 

 the common Japanese species japonica Moore. The only apparent external differ- 

 ence in colour-pattern is in the subterminal fascia on the fore wing, which is absent 

 in all except one of the specimens of grisearia examined but present as faint neural 

 dots in nearly all the available japonica material. However, several features in the 

 male and female genitalia serve to distinguish grisearia from japonica (see list of 

 these under japonica). The extent of these morphological differences are sufficient 

 to justify specific separation of grisearia and japonica. 



Distribution. Russia (Amur region and Vladivostok) and Japan (two localities, 

 Usui Pass and Chuzenyi, in central Japan, both at an altitude of approximately 

 1000 metres). The range of grisearia was presumably once much more extensive in 

 Japan than at the present, permitting genetic interchange with the Russian popula- 

 tions. Extinction must then have occurred leaving isolated populations of grisearia 

 in Japan. This is the pattern of distribution for which Kurentzov (1961) postulates 

 a Pleistocene origin. Possible hybridization with the closely allied and probably 

 monophyletic japonica may be prevented by the different times of emergence of the 

 imago which in grisearia appears in June, at least in the Amur region (Staudinger, 

 1892), and in japonica appears in April-May and July-September (Inoue, 1962). 



Material examined. Type. Holotype $, S.E. Russia, Amur R., Raddefka ; 

 Drepanidae genitalia slide No. 731. In the Zoologisches Museum, Berlin. 



Other material. Museum Koenig, Bonn. Japan : 1 $, Japan, Chuzenyi, 

 13.ix.1928. BM(NH). Japan : 1 <$, Chuzenyi, 10. ix. ; 1 <$, Central Japan, 

 Kotzuke, Usui-toge, [Central Honshu, Gumma Pref., Usui Pass, 950 m.] mid Aug. 

 1923 (Sugitani). Zoological Institute, Leningrad. Russia : 2 <J, Vladivostok, 

 8.iii.i9i4, 13.vi.1916 (Kriger-V oinovsky) . 



Nordstroemia recava sp. n. 



(PI. 4, fig. 327 ; Text-figs. 153-157) 



o\ $. Palp orange-buff ; vertex of head dark brown, front paler brown ; antennae bipec- 

 tinate to just over half its length in male, filiform in female, proximal half of antennal shaft 

 very dark brown and brilliantly lustrous dorsally ; collar orange-buff. 



Thorax speckled with greyish white and pale grey-brown dorsally, pale buff ventrally. 

 Colour-pattern of both wings as in PI. 4, fig. 327 ; ground-colour of both wings pale lustrous 

 grey, densely irrorate with layer of longer scales the latter pale greyish brown at base and 

 greyish white distally ; costa orange-buff ; apical part of outer margin and costal patches 



