276 LEPIDOPTERA. 



scarcely any dark bordering, has the central band complete 

 and sharply marked, and looks like a totally different species. 

 A curious form has been found in the North of England by 

 Messrs. Robson and Gardner, in which, while the markings 

 are dark, the cilia are white. 



On the wing from the end of May till August, apparently 

 in one generation, emerging at long intervals. This extension 

 seems to occur more particularly in damp situations. 



Larva slender, rather roughened but without humps ; 

 head rounded, pale green, a broad ill-defined chocolate-brown 

 stripe runs down each lobe from the top, mouth spotted with 

 the same colour ; body yellowish-green ; dorsal stripe double, 

 dark green, but concluding with a red-brown patch at the 

 anal extremity ; subdorsal lines also double, dark green ; 

 spiracles minutely dotted with black ; spiracular region 

 puckered, and rather inflated or rigid, clouded with whitish- 

 green ; undersurface and legs clearer green. Rather active, 

 and remarkably flexible, having a sort of fondness for reach- 

 ing back and stepping over its own anal segment. (From 

 larvfe kindly furnished by Mr. W. H. Harwood.) 



June till August or September, on sallow, osier and aspen, 

 sometimes on poplar and hazel. It hides during the day 

 under a leaf of its food-plant, with which its colour harmon- 

 ises very closely. 



Pupa short and stumpy, the abdominal rings particularly 

 coQtracted ; the head not prominent and limb-cases closely 

 appressed ; antenna-covers more prominent, and very neatly 

 beaded ; wing-covers showing obscurely the wing-nervures, 

 smooth and not very glossy ; dorsal and abdominal regions 

 dull but hardly perceptibly pitted, segments ridged behind ; 

 anal segment thickened, provided with a very small conical 

 cremaster on which is a short spike ; colour dark red-brown ; 

 segments rather brighter red. In a soft cocoon of silk and 

 earth ; underground. 



The winter is passed in this condition. 



