184 Mr. Vicors’s and Dr. HonsrrELD's Description of the 
Pectus rufescenti-albidum, rhachibus rufis. Remigum mar- 
go internus albo angulatus, rufo-variegatus. Rectrices sub- 
tus albe. Rostrum pallidum apice nigro. Longitudo cor- 
poris, 123; ale a carpo ad remigem secundam, 10; caude, 
O5 costes, 4$; tarsi, 11. 
‘This bird," as we are informed by Mr. Caley, “is called 
Nankeen Hawk by the settlers. It is a migratory species. My 
specimens were shot in May and June 1803. At that time the 
species was plentiful; but ever afterwards I observed it but 
sparingly. On the 3rd of August 1804, I made the following 
note :—I saw no Nankeen Hawks this autumn.—I never observed 
it attacking the fowls.” ` Es 
 'The species is closely allied to a group which is noted for the 
general similarity and the corresponding disposition of its co- 
lours ; and which includes our Kestril, F. tinnunculus, Linn, 
the Keyygis of Aristotle; the newly-characterized European spe- 
cies, F. tinnunculoides, Temm. ; the African species, F. rupico- 
lus, Daud.; and some others. The group may be observed to 
possess a greater shortness of wing than is usual among the true 
Falcons; a character, which points out the passage from those 
birds to the Hawks. Our species appears decidedly distinct 
from any of the group which we have met with. - 
3. Bertcora. F. rufo-brunneus, gulá, collo, nucháque pallide 
aurantiacis, tectricibus remigibusque fusco-brunneis rufo-no- 
tatis, rectricibus cineraceo-brunneis rufo-fasciatis apice pal- 
lido. : 
Rostrum pedesque plumbei. Pteromatum remigumque pogonia 
-- interna rufo-fasciata ; externa, remigum quatuor extimarum 
 pogoniis exceptis, rufo-maculata. Tectrices inferiores rufæ. 
Remiges subtus ad basin albidæ, ad apicem fusca. Femora 
parcè 
