er | CHAPMAN, Spring Moult of the Bobolink. 149 
then colored from nature. It is a little enlarged. Figs. 6 and 7 were 
drawn and tinted from specimens under the microscope. 
It is a pleasure to acknowledge my indebtedness to Mr. Baldwin Cool- 
idge for the care and skill with which he has reproduced the original 
colors. Fig. 3 is by the author.) 
Figure 1. Spring color-change without ‘moult’ of the feather. An 
old feather of the color of the spring plumage. (March 1, Brazil, 
Corumba. Coll. American Mus. Nat. Hist., No. 32783.) 
Figure 2. Spring ‘moult’ without color-change in the feather. A 
new-growth feather the color of the winter dress. (March 1, Brazil, 
Corumba. Same skin as preceding.) 
Figure 3. Spring color-change without ‘ moult’ of the feather. The 
first black feather seen on my Bobolink. (March 28, cage-bird. ) 
Figure 4. Fall ‘moult’ without color-change of the feather. A new 
feather, but the color of the preceding plumage. (August 29, Minne- 
sota. Coll. Amer. Mus. Nat. Hist., No. 52326.) 
Figure 5. Fall ‘moult’ with partial color-change of the feather. A 
new-growth feather, showing the ‘foci’ of darker shade, partly obscured 
by the yellow of the fall dress. (August 2, New York. Amer. Mus. 
Nat. Hist., No. 32785.) 
Figure 6. Spring feather, transverse section. From a deep black 
feather of the breeding dress, in its terminal third. Granules of coloring 
matter, chiefly massed peripherally, producing the effect of black. (May 
30, Mass. Coll. A. P. C., No. 2672.) 
Figure 7. Fall feather, transverse section. Like Fig. 6, but of the 
Reed-bird type. Granules not massed peripherally, but scattered through- 
out. (September 17, Mass. Coll. A. P. C., No. 3522. 
(Figs. 6 and 7 with Zeiss 4 mm. apochromat. objective, and No. 6 comp. 
ocular. ) 
REMARKS ON THE SPRING MOULT OF THE 
BOBOLINK. 
BY FRANK M. CHAPMAN. 
In his paper on “ The Spring Plumage of the Bobolink, with 
Remarks on ‘ Color-Change’ and ‘ Moulting,’” published in this 
number of ‘The Auk,’ Dr. Chadbourne has shown that captive 
