LÉPIDOPTÉROLOGIE COMPARÉE 383 



harrisonu owing to the hirtaria influence, it is slightly elevated 

 anteriorly. 



Lying over. 



Very few of the pupae lie over more than one winter, one or 

 two in each brood being the maximum and thèse only do so for 

 two wmters. 



Dehiscence of pupae. 



The maie émerges just as in denhami, but, in the case of the 

 female, there is a greater tendency for the thorax to be ruptured 

 and for the leg and antenna^ cases to be quite detached. 



Imago. 



a) Mâles (PI. CLXI, No. 1573). The ground colour is ochreous 

 of an even paler type than in denhami, and, while tending to be 

 suffused like that form, the suffusion is rarely so perfect; even 

 comparing somewhat similar spécimens of the two the lighter 

 patches in harrisonï are much whiter. This contrast in the paler 

 markings, is nowhere more perceivable than at the lower end of 

 the subterminal pale band and on the ground before vein one. 



The various lines in the forewings except the subterminal pale 

 band, which seems a little broader in the présent insect, take the 

 same path in both forms; this, combined v^ith its pale colour, 

 makes it stand out more prominently in harrisonï. Just before 

 the band reaches the inner margin, it bends more decidedly toward 

 the termen in denhami, with the resuit that considering most spé- 

 cimens, the subtermirial suffusion is stronger and broader in Har- 

 risonï, whilst the prassubterminal, especially on the inner margin, 

 is more prominent in denhami. The veins are more clearly out- 

 lined in black and tend to be more continuous over the subter- 

 minal band in denhami. The hindwings are very différent in the 

 two hybrids. In denhami, the markings are highly developed 



