MARSH HAWK. 
birds have escaped my notice. This is, per- | 
haps, especially the case with the birds of tlie | 
genera Anas, Tringa, and of the extensive | 
order of PaiTeres, &c. which I suspe6h are 
constant in their migrations from the north to 
the south, and from the south to the north. 
A good many of the birds which are mentioned ii 
by Mr. Pennant as natives of Kew Yorkjj i 
have not hitherto, to my knowledge, been| i 
observed in Pennsylvania ; but it can hardlY[^ 
be supposed that these species which are ccm-j i 
men in New "l^jrk — if we except such asj.;! 
■deh^ht in the vicinity of the sea- coast — are);| 
uncommon, or never seen, in Pennsylvania, 
■Here^ hovv'ever, I must observe, that I canno: 
but suspe6l that Mr. Pennant, Mr, Latham, 
and ether able ornithologists, have sometimes 
described, as dislindt species, birds which 
merely di -a er in sex j or in age; and in their 
colourivig, for which these animals, at diixe- 
reiu seasons of the year, are so remarkable." 
Still w^e liave great doubt, that a bird oil 
such magnitude as th.e Marsh Hawk, if it vrere} 
■a constant or even frtquent visitor of Pennsyl-,'1 
vania, would have escaped the notice of so in- } 
telligent an observer. 't 
Ii 
