Alois may be distinguished from Bupalus, by the males being 

 invariably smaller than the females; the eyes are larger and 

 not so distant in front, the palpi are more porrected, shorter, 

 and not hairy, the maxillae are very long, the antennae are not 

 pectinated to the apex : the singular character of the hind legs, 

 which 1 believe has never before been noticed, is very difficult 

 to detect, except by dissection ; the 8th and 9th species do not 

 possess it, and possibly some of the others, of which I either 

 had not males, or they were too valuable to be examined. 

 Many of the Lepidoptera have their legs, especially the pos- 

 terior, furnished with brushes of hair, most probably to balance 

 them in their flight ; but none are more curious than those of 

 the males of Aids ; the posterior tibiae are very long and ro- 

 bust, and on the internal side may be traced a longitudinal 

 suture extending the whole length, which from the tibia being 

 hollow can no doubt be opened and the long brush of silky 

 hair may be exserted at the pleasure of the insect. The fol- 

 lowing are our British species. 



1. Alcis Kohorar'ia Fab., Don. v. 15. pL 527. 



2. sericearia Nob. 



3. consortaria Fab., Doji. 10. 333. 2. 



4. conversaria Hub., Don. 15. 514. 



5. destrigaria Haw. 276. 11. 



6. repandaria Linn., Don. 10. 333. 1. 



7. muraria Nob. 



8. rhomboidaria Hub, 



9. Australaria Nob. 



10. consobrinaria Haw. 



1 1 . fimbriaria Hub. ? 



Several females and one male of the nondescript figured were 

 taken last July near Lyndhurst in the New Forest, and are 

 now in the cabinet of Mr. Stone, to whom I am indebted for 

 the species as well as for the loan of the beautiful male repre- 

 sented in the plate. It is probably an oak-feeder, one of the 

 females having been found upon the trunk of that tree, and 

 the other specimens having been beat out of the branches. 



A. 7nuraria is a new species that I found upon walls in the 

 Isle of Arran ; it is nearest allied to A. repandaria ; it is how- 

 ever smaller, of an uniform gray, more speckled, and the 

 markings are more obscure. 



A. Australaria is an insect from the western counties, re- 

 sembling A. rhomboidaria, but having a deep ochraceous tinge 

 with powerful markings : for the specimen in my cabinet I am 

 indebted to Charles Lyell, Esq., who took it in the New 

 Forest, Hampshire. 



Epilobium tctragonum (Square-stalked Willow-herb) is the 

 plant represented in the plate. 



