192 DWIGHT 



6. ADULT NUPTIAL PLUMAGE acquired by a complete pre- 

 nuptial moult as in the young bird. 



Female. The sexes are practically indistinguishable and the 

 moults identical. 



Ammodramus caudacutus nelsoni Allen. NELSON'S SPARROW 



Ammodramus caudacutus subvirgatus Dwight. ACADIAN 

 SHARP-TAILED SPARROW 



The plumages and moults of these two races correspond ex- 

 actly to those of A. caudacutus. I have indicated their differences 

 of plumage in another paper (Auk, XIII, 1896, pp. 271-278) 

 and need only add that all these birds undoubtedly have two 

 complete moults every year, judging by a large amount of ma- 

 terial illustrating all plumages except the natal and Juvenal of 

 A. c. nelsoni which is unknown in collections. 



Ammodramus maritimus (Wils.). SEASIDE SPARROW 



1. NATAL DOWN. No specimen seen. 



2. JUVENAL PLUMAGE acquired by a complete postnatal moult. 



Above, including sides of head and the tail, olive-brown narrowly streaked on 

 pileum, nape and upper tail coverts and more broadly on the back with clove- 

 brown. Wings dull black, primaries edged with olive-gray, secondaries with 

 russet, coverts and tertiaries with buff, alulae with white. Below, dull white 

 washed with buff on sides of chin, on jugulum, along the flanks and on 

 crissum and narrowly streaked on jugulum and along the sides with clove- 

 brown. The supraloral space is greenish. Bill and feet pinkish flesh, the 

 former becoming slaty and the latter sepia-brown. 



3. FIRST WINTER PLUMAGE acquired by a complete post- 

 juvenal moult beginning the latter part of August when the 

 juvenal plumage has become worn and faded as a result of fully 

 two months' wear. Young and old become indistinguishable. 



Unlike the previous plumage, less definitely streaked. Above, including sides of 

 head, wings and tail olive-green, pileum and back cinereous from the olive 

 and pearl-gray edgings, median crown stripe pure cinereous gray bordered by two 

 lateral stripes of olive-green obscurely streaked with black. The primaries are 

 edged with olive-green, the outer with white, the secondaries, tertiaries and 

 greater coverts with rich russet, the lesser with olive-yellow, the alulae with 

 whi'e. The edge of the wing is bright lemon and a yellow spot is acquired in 



