Ns having the rump immaculate white, instead of spotted. 
108 AMERICAN WATER BIRDS. 
mondii Gray, Arabis canescens Nutt., Draba alpina L., Smelowskia — 
calycina ©. A. Mey., Arenaria arctica Stev., Ivesia Gordoni Torr. — 
and Gray, Potentilla dissecta Pursh, Astragalus alpinus L., Astrag- 
alus Kentrophyta Gray, Lupinus minimus Dougl., Sedum stenope- 
talum Ph., Townsendia (not determined as to species. No. 145) 
Erigeron compositum Ph., Senecio canus Hook., Achilea millefolium 
L., Phlox Douglasii Hook., Polemonium humile var. (P. parvifolium 
Nutt.), Mertensia alpina Dougl., Myosotis alpestris L., Eriogonum 
ovalifolium Nutt. ; 
In a concluding article, the general botanical features of Yel- 
lowstone Park and the head waters of Snake and Wind Rivers will 
be considered. 
TE.—In order to render the determination of the new species mentioned in this 
N 
and the Desbeatug paper as TO as Paa and most Convenio for reference, 
- the descriptions will be giy 
NOTES UPON AMERICAN WATER BIRDS. 
BY ROBERT RIDGWAY. 
Tux following are a few pointe which have been developed } 
“ History of North peok Birds,” by Professor Baird, 1 
Brewer and the writer. They are published in advance of ¢ 
work, that ornithologists may thus the sooner have the benefit 
them. 
i In making a comparative study of the North American e : 
ropean Grallæ, I have been struck by a very curious pars 
~ between certain congeneric or conspecific forms of the two 
nents. In many cases, the European analogues differ from 
North American representatives chiefly, if not ‘ie Te 
lowing SRD will show the extent of this — 
eave bad lad occasion to trace it. 
American forms (rump spotted). European forms (rump i 
Perenn solitarius. R. ochropus. 
a flay G. stagnatilis. _ 
N. phæopus. 
