ANOPLURORUM BRITANNIA. 207 



large, lower margin involute ; tibiae abruptly clavate. 

 Length f . 



This species is very extensively spread among the differ- 

 ent species of the genus Falco (Linn.). I have received it 

 from my brother, taken off the Honey Buzzard; Mr. 

 Wallace sent me specimens taken on the Peregrine Falcon 

 in the Isle of Man ; and I have found it in abundance on 

 the Golden Eagle. Dr. Burmeister says it infests the Kite 

 and the White-tailed Eagle, and likewise the Bearded Vul- 

 ture (Gypaetus barbatus). To the Earl of Derby I am 

 indebted for several examples from the Harpy Eagle (Har- 

 pyia Destructor). On the 14th of Nov. 1837, Mr. Yarrell 

 exhibited, at a Meeting of the Zoological Society of Lon- 

 don, a quill from the wing of the above bird, which had died 

 while in the menagerie of his lordship at Knowsley, and 

 which was found upon examination to be infested with a great 

 number of a species of Colpocephalum. It appeared that 

 these minute creatures had chosen for their place of retreat 

 the hollow of the large quill feathers, which were filled with 

 their exuviae ; two circular apertures situated near the base 

 of the quill afforded the animals access to its interior. 

 Another quill infested with the above, his lordship obligingly 

 forwarded to me, with the following remarks : " My super- 

 intendant lately found in a young Harpy Eagle, who was 

 not moulting kindly, two feathers, of which the quills when 

 extracted were filled with a substance he could riot make 

 out, he opened one and found the whole base of the quill 

 filled with lice, at that time alive, but they soon died ; there 

 was at first no apparent opening, but on a close microscopic 

 examination two small holes were observed at the base of the 

 web, since then he has found and extracted four more ; in 

 one, besides the lice, observing something to move, he 

 opened it and found a large white maggot." From the 

 hundreds of skins accumulated in one quill, and to 

 whose interior there had been no access but through the 



