CHESTNUT-SIDED WARBLER 187 



material interwoven consists of the staminate catkins and bud scales of 

 Quercus etnoryi. There is also some wool, vegetable down, and insect 

 webbing, in which there are entangled the exuviae of some caterpillar. 

 Attached to the outside was a small staminate cone of some species of 

 Pinus. Nest well lined with feathers and horse-hair." 



^Si^- — A set of three eggs is described by Ladd^ as "ground 

 color creamy white, marked over entire surface, but more heavily at 

 larger end, where they form a wreath, with light umber and occasional 

 specks of dark chestnut; lilac shell-markings at large end only." Size; 

 .51X.70, .50X.69, .50X.68. 



Nesting Dates. — Yavapai Co., Arizona, June 23 (Ladd). 



Biographical References 

 ( I ) S. B. Ladd, Description of Nest and Eggs of Dendroica gracice, Auk, 

 VIII, 1891, 314. (2) O. W. Howard, Summer Resident Warblers of Arizona, 

 Bull. Cooper Orn. Club (=Condor), I, 1899, 39. 



Chestnut-sided Warbler 



DENDROICA PENSYLVANICA (Linn.) Plate XII 



Distinguishing Characters. — Adults of both sexes may be known by their 

 chestnut sides, yellowish wing-bars, yellow or yellowish crowns, the wholly 

 different young by bright greenish yellow upperparts, yellow wing-bars, white 

 eye-ring, grayish cheeks and underparts. Length (skin), 4.50; wing, 2.50; tail, 

 1.95; bill, .35- 



Adult <S, Spring. — Crown yellow, forehead white ; back greenish yellow 

 broadly streaked with black, the nape grayish ; tail black margined with gray the 

 three outer feathers with white patches at the end of the inner web ; primaries 

 margined with grayish, inner flight-feathers with yellowish, median coverts 

 tipped, greater coverts tipped and margined with yellowish ; ear-coverts and 

 sides of neck white enclosed by a black post-ocular stripe and black patch 

 below the eye and on the side of the throat, from the latter springs a bright 

 chestnut stripe which, broadening, passes along the sides to the flank, rest of 

 underparts white. 



Adult ^, Fall. — Above bright greenish yellow indistinctly streaked on back 

 and rump ; tail and wings as in Spring <^, whole side of head gray, eye-ring 

 white; the sides and flanks chestnut, rest of underparts white. 



Young S, Fall- — Similar to adult d" in Fall but with less, or no chestnut 

 on sides. 



Adult 2, Spring. — Similar to adult c^ in Spring but duller, black areas less 

 pronounced, tail and wings browner, chestnut stripes less developed. 



Adult ?. Fall. — Similar to young c? in Fall. 



Young 9, Fall. — Similar to adult ? in Fall but always without chestnut 

 on sides. 



Nestling. — Above brown indistinctly streaked with black; below pale brown- 

 ish, the belly white ; wings and tail as in young, the coverts tipped with buffy. 

 General Distribution. — Eastern North America; north to New- 

 foundland and the Saskatchewan ; west to the Plains. 



