NESTS OR YOUNG Fall Migration 
@ 1950 — ae 
We cannot say when the fall migration actual 
A 31900-1949 begins, but by July 15 we have seen groups of bai 
@ BEFORE 1900 swallows arriving in areas where there are no o 
onies. After mid-July it becomes increasingly co; 
PAIRS OR SINGING mon to see flocks of bank swallows, sometin 
MALES (JUNE) | numbering hundreds of birds, closely spaced alo 
woo | posed the power lines. It is a scene especially typical 
O 1950 — | i iROQUOIS Z . e 
nl as at the large river bottoms of western Illinois; by co 
A\ 1900 - 1949 ae RAs ee parison, very small numbers are seen in east-cent 
MASON Sa y H ° ° 2 s 
are <n tee © (conn [we Illinois (Fig. 8). In August we often witnessed t 
ene el rl) strong affinity for heat which bank swallows a 
(es ee ee +-—| : 
wrens) Soe Lo green Tee some other species of swallows show. In the hott 
ho Lg fons pe @L part of the day the birds would rest on the grou 
Gee ese: eae and press themselves against hot sand in the ro 
| ol Si pee ts Ns During July and August bank swallows 
Se ere nial JASPER Nvaantond 
parently roosted regularly in the large commu 
roosts of purple martins along the Mississippi Ri 
near St. Louis (Widmann 1898). 
Peak populations came in August and early §$ 
tember, and bank swallows were virtually gone 
mid-September. Our last record was September 
in southern Illinois. Strode (1892) reported a gi 
migration of thousands of bank swallows along 
Spoon River on September 25, 1891. “Tae 
servation may have been based on a misidentificat 
of tree swallows, but in view of the bank swallc 
i 
Y) Maoison | | + — 
eG aS {ricntano LAWRENCE 
| 
| 
| 
i 
ST CLAIR ‘ara —_ 
BANK SWALLOW (30s | 
BREEDING. RECORDS @ “0 4 40 
) 
RAWDOLPH | PERRY y Te | wnat 
( { erbemn |) ie 
ce 
Ye 
JACKS! | 
oN | WILLIAMSON SALINE ‘ 
t \ 
UNION ~ {JOHNSON 
Fig. 10.—Site of nesting colony of bank swallows in a sawdust mound. Note the burrow entrances in the bank wall (near ce 
12 
