1872] ; 193 [Holden — Aiken. 
this species, in common with the Mourning Warbler, Geothlypis phila- 
delphia, never occurs as a winter visitant at any point of Central 
America north of Costa Rica. 
Dr. Brewer communicated the following paper from the 
authors. 
NotTEes ON THE Birps or Wyoming AND CoLoRADO TERRITO- 
RIES. By C. H. Houpen, JR.; with appiTionaL MeEmo- 
RANDA BY C. FE. AIKEN. 
The following interesting notes were prepared for my own private 
perusal, and not designed for publication. They are possessed of too 
much interest to be withheld, embodying as they do the careful observ- 
ations of two promising young ornithologists, who have explored, 
at different seasons of the year a comparatively new field. I should 
add that these notes were prepared, simultaneously, but without con- 
sultation, as the writers were a thousand miles apart when they were 
written. Mr. Holden’s visit was made in summer, Mr. Aiken’s ex- 
perience between November 1st, 1871 and May, 1872. The notes of 
the latter are in quotation marks and signed C. E. A. TT. M. B. 
The birds and eggs upon which these notes are written were found 
in the immediate vicinity of the ‘‘ Black Hills” in the northern part 
of Colorado and southern part of Wyoming Territories. That so few 
egos were obtained is accounted for by the fact that my collecting did 
not begin until the 10th of June, 1869, and although many nests were 
found, yet nearly all contained young birds, instead of the wished for 
eggs. Jam of the opinion that nearly all of the eggs are of the 2d 
incubation, with perhaps one exception, (Pipilo chlorurus), and I 
have no other reasons for believing that is not, than the condition of 
the plumage. 
The character of the region of Sherman, which is 8000 feet above 
the sea-level, is dreary in the extreme. It consists of several level 
plateaus, interspersed with ‘‘ cafions” and meadows. I found no birds 
plentiful with the exception of the Rusty Black-Birds, and it was dif- 
ficult to obtain more than four or | ve specimens in a day. 
The following specimens, full) -dentified, are with one or two ex- 
ceptions, in my collection. 
1. Turdus migratorius. Robin. 
Robins were quite common. I never observed them at any great 
distance from the brooks along which they breed. I found a number 
PROCEEDINGS BL. S. N. H. — VOL. XV. 13 DECEMBER, 1872 
