1899] GROUSE FLY. 69 



such as disinfecting bags in which infested grain has been conveyed, 

 clearing out all places of shelter in refuse, fumigation of bins, thick 

 white-washing to stop up all chinks in walls, and the like remedies, 

 would all be serviceable in getting rid of the infestation in stores, or 

 bakeries, or similar places where it may occur with us. 



GROUSE. 



Grouse Ply. Ornithomyia avicularia, Linn. 



Ornithomyia aviculakia. — 1, Grouse Fly, magnified, with line showing natural 

 length ; 2, puparium, magnified and natural size ; 3, end view, magnified ; 4, claw, 

 magnified. 



Ornithmyia avicularia, figured above, is a small two-winged fly from 

 two and a half to three lines in length, tough or leathery, somewhat 

 elliptical in shape, and flattened, of variable colour, but usually of 

 some shade of brown, and is found on birds ; with us it is chiefly 

 noticed on Grouse [La<jopus scoticus), whence its usually adopted name 

 of " Grouse Fly." 



I am not aware of it ever being injurious or seriously troublesome 

 to birds by its presence amongst their feathers, as the nearly allied 

 " Horse Forest Fly " [Hippobosca equina) is amongst the hair of Horses 

 and Cattle, or the "Deer Forest Fly" {Lipuptera cervi) amongst the 

 hair of Deer ; but observations are occasionally sent me regarding it 

 being noticed in connection with Grouse ; and the genus Ornithomyia, 



