BIRDS OF NORTH AND MTDDLK AMERICA. 481 



and o;reator \vin,<z:-coverts and socondaries narrowly and indistinctly 

 margined with paler; primaries and rectrices more dusky, with narrow 

 and indistinct paler edgings; malar region, chin, and throat pale 

 brownish buff or dull buffy whitish; rest of under parts clear buff, 

 entirely unstreaked; bill, iris, and feet as in adult male; length 

 (skinsi, 108-113 (110); wing, 55-57 (55.5); tail, 45-46 (45.8); ex- 

 posed culmen, 11.5-12 (11.6); tarsus, 16-16.5 (16.1); middle toe, 

 9-9.5 (9.3). « 



Young. — Pileum dusky, streaked with brownish buff or clay color; 

 rest of upi^er parts dark sooty brown or dusky, the feathers margined 

 terminally with brownish buff, those of the rump broadly tipped with 

 brownish buff or buffy brown; middle and greater wing-coverts 

 rather broadly tipped with cinnamon-buff, forming two distinct bands; 

 secondaries broadly margined terminally with pale bufl", the rectrices 

 tipped with cinnamon-buff; under parts pale yellowish buff; paler on 

 throat, the chest with a few narrow streaks of dusky. 



Galapagos Archipelago (Chatham Island only). 



PyrureplialiisdiibiiisGouLV, Zool. Voy. "Beagle," iii, 1841, 46(Galapagos Archipelago; 

 type now in coll. Brit. Mu8.). — Ridgway, Proc. U. S. Nat. Mus., xvii, 1894, 

 368 (Chatham I.; descriptions). — Rothschild and Hartert, Novit. Zool., 

 vi, 1899, 173 (Chatham I.); ix, 1902, 403 (Chatham I.; descr. young, nest, 

 and eggs). — Rothschild, Bull. Brit. Orn. Club, pt. xii, 1902, 47 (Chatham 

 I.; descr. nest and eggs). — Snodgrass and Heller, Proc. Wash. Ac. Sci., 

 V, 1904, 272 (Chatham I.; crit.; measurements). 



[Pyrocephalus] dubiiis Sharpe, Hand-list, iii, 1901, 134. — Rothschild and Har- 

 tert, Novit. Zool., ix, 1902, 417 (Chatham I.). 



P[yrocephalus] dubius Rothschild and Hartert, Novit. Zool., vi, 1899, 202 

 (Chatham I.). 



ryrocephalus nanus (not of Gould) Salvin, Trans. Zool. Soc. Lond., ix, pt. ix, 187G, 

 492, part.— Sclater, Cat. Birds Brit. Mus., xiv, 1888, 214, part. 



[Pyrocephalus] nanus Sclater and Salvin, Nom. Av. Neotr., 1873, 51, part. 



Pyrocephalus minimus Ridgway, Proc. U. S. Nat. Mus., xii, no. 767, Feb. 5, 1890, 

 113, in text (Chatham I., Galapagos Archipelago; coll. U. S. Nat. Mus.). 



Genus NESOTRICCUS Townsend. 



Nesotriccus b Townsend (C. H.), Bull. Mus. Coni}:). Zool., xxvii, n<i. 3, July, 1895, 

 124. (Type, N. ridgwayi Townsend.) 



Small Tyrannida3 (wing about 60 mm.) related to Erihates but 

 differing in relatively narrower, more de])ressed, and more sharply 

 ridged bill, shorter tail and wing (the former very slightly longer than 

 distance from bend of wing to end of distal secondaries, the latter only 

 tlii-ee times as long as tarsus) and longer tenth (outermost) primary 

 (equal to second instead of shorter than fu^st) . 



Bill about as long as head, much depressed basally, narrowly 

 wedge-shaped in vertical profile, its width at posterior end of nostrils 



a Four specimens. 



ft " F?)(Jo5i= island; 7'mTHS = genus of tyrant flycatchers." 



11422— VOL 4—07 31 



