286 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
The earliest date for eggs has been June 5, 1908. The following 
are dates of nesting: 
Nest 
T. 
June 
5, 
1908 — 3 Cowbircl’s and 1 Vireo’s 
eggs. Aban- 
doned. 
Nest 
2. 
June 
14, 
1909 — 2 Cowbird’s eggs. 
Nest 
3. 
June 
1, 
1910 — Partly constructed. 
June 
11, 
1910 — 3 Vireo’s eggs. 
June 
18, 
1910 — 5 Vireo’s eggs. 
Nest 
4. 
June 
1910 — 1 Cowbird’s egg. 
Nest 
5. 
June 
5, 
1910 — Empty, just finished. 
Nest 
6. 
June 
18, 
1910 — 1 Vireo’s egg. 
June 
22, 
1910 — 4 Vireo’s eggs. 
Nest 
7. 
June 
24, 
1910 — 3 Cowbird’s eggs. 
Nest 
8. 
June 
24, 
1910 — 1 Cowbird’s egg. 
Nest 
9. 
June 
24, 
1910 — 1 Cowbird’s egg. 
Nest 
10. 
June 
20, 
1915 — 1 Cowbird’s and 2 Vireo’s eggs. 
June 27, 
1915 — 1 young Cowbird, Vireo’s eggs 
infertile. 
July 
3, 
1915 — Yng. Cowbird dead, no eggs. 
Abandoned. 
Nest 
11. 
June 
20, 
1915 — 4 fresh Vireo’s eggs. 
June 
27, 
1915 — 4 Vireo’s eggs. 
July 
3, 
1915 — 2 young and 2 eggs. 
July 
11, 
1915 — 3 young Vireos. 
Nest 
12. 
June 
20, 
1915 — Just finished. No eggs. 
June 
27, 
1915 — Vireo’s eggs chipped. Abandoned. 
Nest 
13. 
July 
Q 
1915 — Partly constructed. 
July 
11, 
1915 — Abandoned. 
SITUATION OF NEST. 
The smaller shrubbery bordering upon thickets and woods 
is the habitat usually selected by the Bell’s Yireo for a home. 
Many different kinds of trees and bushes are found in such 
places but those to which the above thirteen nests were at- 
tached included wild plum, gooseberry, small willows, wild haw, 
snowberry and dogwood. In these the nest was hung from a 
horizontal crotch not far from the ground, the distances of 
the above being 2 y 2 , 2, 5, 3, 2, 3, 2y 2 , 2%, 2y 2 , 2%, 2%, 2 and 
5 feet. These will average 2 11-16 feet high. 
NEST ARCHITECTURE. 
There is a great field for study in the architecture of the 
Bell’s Yireo ’s nest. Its hanging nature must present many un- 
usual demands for special construction. Some of these were 
noted in nest number 13 above, but a forced absence of the 
writer prevented a continuance of the study. In this nest the 
first materials were placed on the horizontal branches and al- 
