NOTES AND NESTING HABITS OF BIRDS. : 197 
* Callithamnion Turneri Ag. _ Ulva latissima L. 
Callithamnion Daviesii Ag. . Cle lophore arcta Dillw 
Callithamnion luxurians Ag. Ciadopho at land ysa Roth. 
p Cladop no 2 Griff. 
Cla adophora flexuosa Griff. 
CHLOROSPERMEX ( Grass-green Algz). Cladophora albida Huds. 
Cladophora gracilis Gri if. 
Br yopsis plumosa Lam Cla mn fracta Fl. Dan 
Vaucheria (species ‘ nik described by Chetomorpha ARRA. Web. and 
Harvey, allied to V. Murina). < 
Porphyra vulgaris Ag. (ements ærea Dillw. 
Bangia fuscopurpurea Lyngb. . - Cheetomorpha Olneyi Harvey. 
Enteromorpha intestinalis Linb. Hormotrichu tite nS Dillw. 
Enteromorpha ish e rg Calothtix confervicola. 
Enteromorpha compressa Gre ~ Calothrix sieocioesan 
Enteromorpha shachrats caer 
ON LOCAL VARIATIONS IN THE NOTES AND 
ESTING HABITS OF, ‘pean 
BY ROBERT RIDGWAT. 
Mr. Arren has called attention to the variation in the notes of 
different birds at remote localities ; and in this I am able to corrob- 
orate him, though I think that cases of such variation are very 
rare, and do not occur in more than perhaps five per cent. of the 
species. I have only detected it in two or three species after the 
most careful observation, and in very many cases noticed that 
there was not, in the minutest particular, any difference between 
individuals of one species on opposite sides of the continent. 
Such is undoubtedly the case in a very great majority of the spe- 
_ cies, any seeming variation that may be observed being more 
probably the peculiarity of an mdividual rather than the mani- 
festation of any regional impress. The only instances wherein I 
have yet been able to satisfy myself of a difference in notes in 
two regions are the following; Cardinalis Virginianus has a far 
finer song in southern Illinois than it has in Maryland, the notes 
_ being not only clearer and more musical, but the song more con- 
tinued and energetic; the effect being altogether richer. In the. 
vicinity of Washington, D. C., I have never heard, in a single in- 
stance, the Baltimore oriole (Icterus Baltimore) utter such mellow, 
flute-like notes, as it habitually does in southern Illinois. The 
