72 LEPIDOPTERA. 



On the wing at the end of May and in June ; and again 

 in August and the beginning of September, in a partial 

 second generation. 



Larva stout, head divided, flattened in front, larger than 

 the second segment ; fourth segment with a bifid dorsal 

 eminence ; anal prolegs absent, extremity terminating with 

 a sharp point. Colour pale ochreous ; dorsal line slightly 

 darker but only extending to the protuberance on the fourth 

 segment ; head yellowish, edged with a purple line on each 

 side, which is bordered outwardly with yellowish ; anterior 

 segments purplish, to, and including, the dorsal hump. 

 From the head a yellowish line on each side join together 

 on the sixth segment, branching off to the top of the dorsal 

 hump ; from the seventh segment they divide again, and then 

 meet on the eleventh, forming a large diamond-shaped 

 yellowish dorsal marking ; from the eleventh segment they 

 again separate, forming two oblique lateral bands, and are 

 continued to the tail. The sides beneath the lateral lines 

 are shaded with pale chocolate-brown, as is also the anal 

 extremity ; on the twelfth and thirteenth segments is a 

 dark diamond-shaped spot. Legs, prolegs and under surface 

 ochreous. (C. Fenn.) 



When at rest it draws in its anterior segments, raising the 

 fourth, with its tubercle, and also the hinder extremity, and 

 has a very humped appearance. 



End of June and July, and again in September, on oak. 



Pupa moderately stout, rather short, light- brown, densely 

 covered with white powdery bloom. In a strong cocoon of 

 brown silk, in a small oak leaf tightly drawn together and 

 strongly united at the edges. In this condition through the 

 winter. 



The moth sits in the daytime in oak-trees, on the leaves, 

 and generally in the higher parts of the trees. It may some- 

 times be disturbed by beating, and more frequently by 



