TRIFIDA:. 261 



were of our usual type except one which shows a decided tinge 

 of the ochreous of the continental B. luteago." I have not seen 

 this specimen but have no doubt of the identity of the two 

 forms. The only English specimen of this species of which 

 T have any knowledge is in the collection of Mr. W. E. Boyd. 

 It has but little resemblance to the Irish form as described, 

 and no resemblance at all to that found abroad, yet it is in 

 my opinion undoubtedly this species. It is of a dull umbreous 

 with a tinge of grey, the orbicular stigma whitish ochreous, 

 the remaining portions of the oblique band pale yellowish 

 brown and less distinct ; the hind marginal region obscurely 

 paler grey-brown ; all the markings are identical, but the 

 tone of colour is very sombre. It is a female of the usual 

 shape and structure. Another, a male, reared by Mr. W. F. 

 II. Blandford from a larva found by him on the coast of 

 South Wales, and generously placed by him in my collection 

 for the purposes of this work, is somewhat intermediate 

 between the last and the Irish form, but much nearer the 

 English. It also has no apparent resemblance to the 

 continental insect. Its colour is a rather warmer, softer 

 brown with a yellowish or almost olive-yellow tinge, the 

 central oblique bar more tinged with yellow, as is the hind 

 marginal region and especially the basal space below the 

 middle. Both these last specimens are slightly smaller 

 than the Irish examples, and their fore wings are not quite 

 so broad. 



On the wing from June to August, but, so far as has been 

 ascertained, only in one generation. 



Larva stoutest at the third and fourth segments, the second 

 tapering a little to the smaller and rather narrow head, and 

 behind from the tenth segment to the anal extremity; the 

 lobes of the head deeply defined at the back of the crown ; 

 ventral and anal legs short and well beneath the body ; the 

 segments very lightly and finely wrinkled towards the well- 

 cut divisions on the back ; the sides much dimpled. The 



