4 BULLETIN 1268, U. S. DEPARTMENT OF AGRICULTURE 
So great is the extent of the territory assigned to most of these 
regional associations that further subdivision will ultimately be 
necessary. This is being anticipated and will be accomplished 
when the cooperators in any geographic area become sufficiently 
numerous and leaders for new groups can be developed. There are 
already many station operators of experience who will, no doubt, be 
capable of furthering such activities. 
RETURNS REPORTED TO THE BIOLOGICAL SURVEY 
Facts relative to the 1,746 returns that were received by the Bio- 
logical Survey during the period from January 1, 1920, to June 30, 
1923, are set forth in this report in tabular form, in order that coop- 
Returns from 
MALLARDS BANDED 
at BROWNING, ILL. 
Fic. 1.—Localities from which bands have been returned that were attached to mallard dueks at the 
Sanganois Club, Browning, Ill., during the period February 28 to March 25, 1922, and September 27 to 
December 15, 1922. In the Mississippi Valley one spot on the ee may indicate several returns. A 
study of the migration of this important game bird is receiving special treatment by means of the banding 
method and, as illustrated, information already received shows a dispersal from the pons of banding over 
a vast region that extends from the coast of Texas and Louisiana north to centra 
katchewan, with an occasional mallard traveling east to the Atlantic coast 
erators and others interested may the more readily use the available 
information for present purposes and as a basis fot further investi- 
gations. In addition, it is believed that the meager results obtained 
from the banding of some species will serve as a stimulus for those 
who may be sufficiently ingenious to devise new and effective con- 
trivances for the capture of birds of these species in larger numbers. 
The tables in this report are presented without discussion, for the 
reason that it is deemed inexpedient to attempt detailed comment 
for all groups when it is obvious that the material will permit a wide 
range of interpretation. This will depend not only upon the charac- 
ter of the returns obtained for different species, but also upon ecologi- 
cal, meteorological, and other factors that demand full consideration. 
Manitoba and Sas- 
i i let es li in al ee a 
