^"I's^"^] Chapman, Spring Moult of the Bobolink. 1 49 



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 lie has reproduced the original 

 colors. Fig. 3 is by the author.) 



Figure i. Spring color-change without 'moult' of the feather. An 

 old feather of the color of the spring plumage. (March i, Brazil, 

 Corumbd. 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 i, Brazil, 

 Corumbd. Same skin as preceding.) 



Figure 3. Spring color-change without ' moidt ' 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. yVmer. 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 'S'ork. 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 etfect of black. (Ma\' 

 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 mas.sed peripherally, l)ut 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 SPRINCI MOULT OE THE 

 BOBOLINK. 



I!Y FRANK. M. CHAl'MAN. 



In his paper on " The Spring Fliunage of the BoboHnk, with 

 Remarks on ' Color-Change ' and ' Moulting,' " i)iiblished in this 

 niiinher of ' 'I'hc Auk,' Dr. Chaclhournc has shown lliat capti\'e 



