Mr. Marxwicx’s Obfervations on Birds. 121 
EXPLANATORY REMARKS on the foregoing TABLE. 
Hirundo ruftica—the Swai llow. 
The Swallow’s firft appearance was generally about the r2th of 
April, never earlier than the 7th, or later than the 27th of that 
month ; and I never faw it later in the year than the 16th of No- 
vember, and then only a fingle bird or two, the generality of them 
difappearing long before that time. 
Hirundo urbica—the Martin. - 
This bird is fomewhat later in its appearance than the foregoing 
one, we having never feen it earlier than the 17th of April; but in 
general it does not appear till towards the latter end of that month, 
and frequently not till May, having one year not been feen till the 
12th of May; and I never faw it later in the year than the 13th 
of November; but, like the former, the generality had difappeared 
before. 
Hirundo Apus—ihe Swift. 
This bird is later in its appearance than either of the two former 
ones, being hardly ever feen before the beginning of May, twice 
only on the 28th and 29th of April during the whole fixteen years; 
and its lateft appearance was on the 18th of May; nor does it re- 
main fo late in the autumn as the former ones, the lateft 1 have ever 
obferved it being the 2d of September. | 
Hirundo riparia—the Sand Martin. 
|. As this bird is not near fo common in this country as the other 
fpecies, my obfervations on its appearance muft be uncertain, though 
I believe it generally makes its appearance very early, as I once ob- 
R ferved 
