— 4:7 — 



2nd somite of abdomen) and belong undoubtedly to the var. fu- 

 mosarius Alpliéraky (Christ, in litt.) from China and Caucasus. 



Thus the geniis Biston Le ach is now represented in the 

 fauna of Amoorland by the following five forms. 



Biston bloeckeri, n. sp., the most interesting form, belonging 

 to the group of Southern, subtropical species. 



Biston betularius Linné typical; widely distributed species. 



Biston betularius L. var. fumosarius Alp h., a form with 

 «discontinuous» distribution. 



Biston cognât arius Guénée, an undoubtedly distinct species; 

 and 



Biston hypoleucos^ n. sp. 



Fig. 1—2. Fig. 3—4. 



Bibliography. 



Alphéraky, S. Lépidoptères des provinces chinoises Sé- 

 Tchouen et Kham, recueillis, en 1893, par Mr. G. N. Potanine, 

 Romanoff, Mém. s. 1. Lépid., IX, p. 140. 



