346 LEFIDOPTKRA. 



We have three species — rather closely allied. 



A. Fore wings grey, witii large black-brown costal spot. 



B. scmifa.sciana. 

 A-. Fore wings white-brown, with blacii-brown costal spot. 



B. hartinanniana. 



A?. Fore wings bright white, with x-shaped black costal 



spot. B. vooffinno. 



1. B. semifasciana, Haw. — Expanse | to J inch (16- 

 19 mm.). Fore wings broad, grej'-brown, with rather darker 

 basal blotch, and a large black-brown costal spot beyond the 

 middle. 



Antennce black-brown ; palpi, head, and thorax dark grey- 

 brown ; the thoracic back-tufts tinged with chestnut ; ab- 

 domen dark-brown. Fore wings short and rather broad, 

 costa strongly arched, apex squared, hind margin perpen- 

 dicular and nearly straight ; pale slate-grey or brownish 

 grej-, basal blotch rather darker and edged by a dark grey 

 stripe from the costa ; central band suggested by a large, 

 dark brown-grey blotch or spot beyond the middle of the 

 costa, its costal edge blackened ; opposite to it is sometimes 

 a dark cloud ; beyond it are three brown costal dots ; cilia 

 grey. Hind wings and their cilia smoky brown. Female 

 similar. 



Underside of the fore wings smoky black, with faint pale 

 brown costal dots. Hind wings smoky white. 



A little variable in depth of the ground colour and 

 markings. 



On the wing from the end of June till August. 



Larva rather plump and slightly flattened ; pea-green with 

 darker green dorsal and subdorsal lines ; head yellowish 

 green ; dorsal and anal plates green ; usually covered with a 

 whitish efflorescence, especially visible in the segmental 

 divisions. 



May and June on Sa/ix caprcca and other sallows, drawing 



