270 
TRANSACTIONS OF THE 
the Yukon to its mouth, where he remained, until liearins 
that an American vessel was at St. Michael's, he proceeded to 
that point, taking passage with Captain Everett Smith for San 
Francisco, touching at the Pribylof and other islands. 
To Captain Smith the writer is indebted for much kind- 
ness and many specimens. His unerring aim has added many 
extremely valuable birds to the collection. The vessel arrived 
in San Francisco near the end of October, and, shipping the 
collection, the writer went home in a few weeks, after as many 
years of exploration and travel. 
The collection has been determined by means of the type 
series of the Smithsonian Institution, and for this privilege, and 
all other needed facilities, the writer is under great obligations 
to Professor Henry, the Secretary. The specimens are divided 
between the Institution and the Chicago Academy of Sciences. 
The nomenclature of this catalogue is that of the Pacific 
Railroad Reports, and the synonymy of the species will be 
found there, and in the following paper of Professor Baird. 
The numbers in brackets are those of the species referred to in 
the check list of North American birds, published by the 
Smithsonian Institution. 
Mr. Bannister and the writer are responsible only for such 
notes as precede their initials. Great care has been taken in 
the record of habits and distribution, and it is presumed to be 
generally accurate. Subsequent collectors will no doubt find 
many points of interest in regard to the geographical distribu- 
tion of the species, which our more limited area of collections 
has not yet made clear. Wm. H. Dall. 
Smithsonian Institution, Jwne, 1869. 
1. Falco anatum Bon. (5.) Duck Hawk. Sliot the pair, pre- 
serving the skin of the male only, near Nuk'koh, fifteen miles above 
SaccMtalontan, Yukon River. Eyes black, surrounded with a light 
yellow membrane. Nest on a dead spruce, young nearly ready to 
fly, June 1st, 1867. Not common, but found from Nulato to Fort 
Yukon, spring and summer. Also obtained by Bischolf at Sitka and 
Kadiak. D. 
2. llypotriorchis columbarius Gray. (7.) Pigeon Hawk. Several 
specimens obtained near Nulato, where it is found all the year round. 
