BIRDS OP NORTH AND MIDDLE AMERICA. 249 



narrowly streaked with whitish, partly blackish, this mostly on upper 

 anterior and lower portions; malar region dull white, usually more or 

 less flecked with dusky; a more or less distinct narrow submalar 

 streak of dusk}^; under parts dull white, interrupted by a broad band 

 of pale brownish gray across upper chest, the feathers composing this 

 band with small concealed spots of dusky; breast light brownish gray, 

 the feathers tipped with dull white, and with large, partially con- 

 cealed, central spots of dusky;" sides and flanks with rather broad 

 elliptical or guttate streaks of dusky; bill black, the basal portion of 

 mandible horn color; iris yellowish; legs and feet dusky horn color or 

 blackish brown. 



Adult male.-~'Lengt\\ (skins), 252-269 (261);^ wing, 113-125 (122);'- 

 tail, 103-115 (108.1);'^^ exposed culmen, 31.5-33 (32);'^ tarsus, 38-38.5 

 (38.2) ;<« middle toe, 23-25 (23.6).'' 



Adult female. — Length (skin), 254; wing, 114.5; tail, 102; exposed 

 culmen, 31.5; tarsus, 38; middle toe, 22.5.'^ 



Hood Island and Gardner Island, near Hood, Galapagos Archipelago. 



Nesomimus macdonaldi Ridgway, Proc. U. S. Nat. Mus., xii, no. 767, Feb. 5, 1890, 

 103, fig. 1 (Hood I., Galapagos Archipelago; coll. U. S. Nat. Mus.); xix, 

 1897, 484, fig. 1; pi. 56, fig. 1 (monogr.). — Rothschild and Hartert, Novit. 

 Zool., vi, 1899, 143 (Hood I.; crit.); ix, 1902, 381 (Gardner I., near Hood).— 

 Snodgrass and Heller, Proc. Wash. Ac. Sci., v, 1904, 359 (Hood I. and 

 Gardner, near Hood; crit.; descr.; measurements). 



N[esoviinuts] macdonaldi Rothschild and Hartert, Novit. Zool., vi, 1899, 200 

 (Hood I. and Gardner I., near Hood). 



{Nesomimus] macdonaldi Rothschild and Hartert, Novit. Zool., ix, 1902, 416 

 (Hood I. and Gardner I., near Hood). — Sharpe, Hand-list, iv, 1903, 105. 



NESOMIMUS ADAMSI Ridgway. 

 CHATHAM ISLAND MOCKINGBIRD. 



Similar in coloration to i\'. niacdonaldl, but bill very much smaller, 

 more slender, and less curved. 



Adults. — Above brownish gray changing to light brown on the rump ; 

 top of head marked with distinct mesial streaks of black (proportion- 

 ally narrower than those of N. macdonaldi) and back with broad 

 mesial spots of dusky (much less intense than those of N. macdonaldi) ; 

 rump and upper tail-coverts (the latter gra3^ish, like back, etc.) with 

 streaks indistinct and mostl}^ concealed; lesser wing-coverts light 

 brownish gra}" with dusky central spots (mosth^ concealed); rest of 

 wings dusky, the middle coverts with broad terminal margins of 

 grayish white, slightly tinged with buff; greater coverts broadly 



« This spotted pectoral band is much broader laterally than medially, where some- 

 times, apparently, interrupted. 

 ^ Four specimens. 

 cFive specimens, 

 d Six specimens. 

 « One specimen. 



