and the nervures extending to the mferlor margin of the wings, 

 and from the other genera by its ample and rounded organs 

 of flight. 



The Ornithomyiee inhabit birds, living amongst the feathers. 

 I have only found them on the Rook, but the Honourable 

 C. Harris observed a very small species on a Buzzard, I think, 

 which was shot near Heron Court; Mr. Cocks detected a 

 species (O. viridis?) on the Moor Buzzard, and Mr. Frankum 

 showed me some specimens of O. viridula ? which were found 

 on a Hawk ; I suspect, however, that birds of prey are not the 

 natural resort of the Ornithomyiae, but that when a quarry is 

 killed by a Hawk, these parasites probably leave the dead bird 

 to prey upon the living one. 



The following are British species ; they all incline more or 

 less to green when alive, and it is probable the eyes and ner- 

 vures of the wings fade also in old specimens. 



1. aviculariaZ//?iw. — Leach in JVern. N. H. S. Mem. voL2. pi. 25. 



Greenish; eyes piceous: antennas ferruginous; wings di- 

 stinctly smoky. Length 2 to 2^ lines. Meig. 

 August, on Black-Grouse and Tit-Pippit. Leach. 



2. viridis Lat. — avicularia? Dofi. 8. pi. 261. 2. 



Greenish ; eyes piceous ; antennae ferruginous ; wings sub- 

 hyaline, foveolated before the apex. 2 lines. Meig. 

 Found on Crows in July and August. If I am right in the 

 species, the only example I have seen, I caught upon my ear 

 whilst I was sitting on the summit of the Puy du Dome ; and 

 as there were no birds to be seen except the Swifts that were 

 flying just over my head, I concluded it fell from them. It has 

 piceous maxillae. 



3. viridula Meig. 



Ochreous variegated with brown : maxillae ochreous : eyes, 

 a spot at the base of the antennae, and round the ocelli, pi- 

 ceous: wings yellowish-fuscous, darkest at the apex, ner- 

 vures ferruginous-brown; tips of terminal joint in hinder 

 tarsi and the claws black : expansion 8 lines. Meigen says 

 the antennae are black. 

 Off Rooks; end of July on a window in Devon, Mr. Dale. 



4. Fringillina Matt. — Curt. Brit. Ent. pi. 585. — and, I expect, 

 DeGeer'sfig. 21-27. pi. 16. v. 6. 



For my specimen of this, the smallest species I have seen, I 

 am indebted to Mr. A. Matthews, who has found it on the 

 Yellow Hammer, Greater Titmouse, and Robin, in the autumn, 

 at Weston on the Green, near Oxford. 



The Plant is Angelica sylvestris (Wild Angelica). 



