]40 Mr. J. H. Leech on 



107G. Erastria fasciana. 



Tortrix fasciana, Linn., Faun. Suec, p. 342 (1761). 

 Nodua fuscnla, Bork., Eur. Schmett., iv, p. 192 ; Hiibn., 



Noct., fig. 297. 

 Bryo'pkila gucnci, Fall, Ann. Soc. Eat. Fr., 1864, p. 27, 



pi. i, fig. 3. 

 Erastria sti/qia, Butl., Ann. and Mag. Nat. Hist., (5) i, 



p. 199 (lcS78) ; III. Typ. Lep. Het., iii, p. 20, pi. xlvi, 



fig. 2 (1879). 

 Erastria distinqnrnda, Staud., Roui. sur Lep., vi, p. 564, 



pi. xi, fig. 2 (1892). 



I obtained this species at Nagasaki in May, and at 

 Gensau in June and July; my native collector took 

 specimens at Ningpo in July, and those in Fryer's 

 collection were from Yokohama and Oiwake. I have 

 also received examples from Ichang, Chow-pin-sa, and the 

 island of Kiushiu. 



Stygia, Butl., differs so little from typical /asci«;t«, that 

 the name seems to be hardly worth retaining even in a 

 varietal sense. 



Staudinger states that his distingucnda always has the 

 fringes of secondaries chequered, and that the fringes of 

 the secondaries of fasciana are never chequered. I find 

 that some of my specimens, agreeing in all other chnracters 

 with distingucnda, have the fringes of secondaries plain, 

 whereas some of the more or less typical examples of 

 fasciana have chequered fringes to tiie secondaries. 



The Eastern Asian series of E. fasciana in my collection 

 comprises forty-four specimens, and embraces all the 

 European forms, as well as those that have been named 

 i'rom Eastern Asia. There are also two forms from Japan 

 that do not seem to be represented in Europe ; in one of 

 these the white patch on inner margin of primaries is 

 traversed by a black sinuous line ; in the other, the 

 ground colour of primaries is of a pale olive-brown, with 

 no dark markings, and the secondaries are almost of the 

 same tint. All these forms, with the exception of the 

 colour aberration last referred to, are connected with each 

 otiier and with the type by intergrades. 



In the case of polymorphic species, the naming of 

 Varieties only leads to confusion, as it is not possible to 

 satisfactorily place the intergrades ; I have, therefore, 



