11 
Mr. R. Ridgway on the Genus Glaucidium. 
them to Paris or London, where they would at once have 
been identified, and thus some useless synonyms have been 
spared from our already overloaded lists, through which the 
much suffering naturalist is obliged to “ plod his weary way. v 
d 
III .—The Genus Glaucidium. By Robert Ridgway, of the 
Ornithological Department, U.S. National Museum, Wash¬ 
ington. 
(Plate I.) 
Two monographs of the genus Glaucidium have recently ap¬ 
peared—the first in the f Proceedings 9 of the Boston Society 
of Natural History for May 1873, by the writer, and the 
second in f The Ibis 3 for January 1875. The latter, by Mr. 
R. Bowdler Sharpe, is a review of the former paper, and em¬ 
bodies, besides certain criticisms, numerous remarks based 
upon very large series of the several species. The present 
paper represents the conclusions arrived at after a careful 
reconsideration of the subject, with much additional material, 
and the benefit of Mr. Sharpens monograph, and is intended 
as a special discussion of the points of variance between the 
two memoirs. 
The following table will show the main points of relation¬ 
ship between the conclusions of the two papers referred to 
and those arrived at in the present one:—- 
Ridgway, 1873. 
Sharpe, 1874. 
Ridgway, 1875. 
1. G. passerinum, var. 
californicum, Scl. 
2 . G. pumilum. 
3. G. lansbergii. ) 
4. G. j ardinii. j 
5. G. ferrugineum. 
6 . G. infuscatum. 
„ var. gnoma. 
7. G. nanum. 
8 . G. siju. 
1. G. gnoma ( Wagl .). 
3. G. pumilum. 
2 . G. griseiceps, Shrp. 
5. G. j ardinii. 
7. G. phalaenoides. 
6 . G. ferox. 
8 . G. ridgwayi. 
4. G. nanum. 
9. G. siju. 
1. G. gnoma {Wagl.'). 
j- 5. G. pumilum. 
2 . G. jardinii. 
| 4. G. ferrugineum. 
3. G. nanum. 
6 . G. siju. 
The species may be determined by the following cha¬ 
racters :— 
