MILVULUS. 327 



middle toe, with claw (or else a conspicuous white cottony patch on 

 each side of rump 1 ). 

 d 1 . Tail-feathers partly rufous; lower parts uniform ashy for ante- 

 rior half (approximately), pale yellowish for posterior portion. 



(Wing about 3.25-4.50.) Myiarchus. (Page 332.) 



d 2 . Tail-feathers without any rufous ; lower parts not colored as in d 1 . 

 e 1 . Wing at least six times as long as tarsus. (Wing about 3.00- 



4.25.) Contopus. (Page 336.) 



e 2 . Wing not more than five times as long as tarsus. 



/'. Sexes alike in color, the plumage without any red, and 

 destitute of streaks on lower parts. 



g 1 . Wing more than 3.25 Sayornis. (Page 335.) 



g 2 . Wing less than 3.25 Empidonax. (Page 339.) 



f 2 . Sexes very different in color, the adult male with whole 

 top of head and lower parts scarlet, the female and 

 young distinctly streaked beneath. (Wing about 



3.25.) Pyocephalus. (Page 345.) 



b 2 . Bill from nostril less than half as long as tarsus, the culm en much curved. 

 &. Wing more than 3.00 ; lower parts, except throat, pure lemon-yellow ; 

 a broad white superciliary stripe ; middle of crown, in adult, with a 



concealed orange patch Myiozetetes. (Page 331.) 



&. Wing less than 2.50 ; lower parts dull whitish or yellowish white ; no 

 superciliary stripe, and top of head without concealed colored 

 patch Ornithion. (Page 345.) 



Genus MILVULUS Swainson. (Page 326, pi. XCL, fig. 8.) 



Species. 



a 1 . Tail-feathers black, the outer one edged with white ; top of head deep black ; 

 axillars pure white. Adult male : Back light bluish gray ; entire lower parts 

 pure white ; middle of crown with a concealed patch of bright lemon-yellow ; 

 length about 12.00-14.50, wing 4.10-4.75, tail 9.00-10.00. Adult female: 

 Similar, but rather smaller, with tail shorter, and yellow crown-spot shorter. 

 Young : Similar to adult, but tail much shorter (sometimes scarcely forked), 

 colors duller, the wing-coverts bordered with pale rusty, and no yellow on 

 crown. Sab. Tropical America in general, including Lesser Antilles ; north, 

 normally, to southern Mexico, accidentally to Mississippi, Kentucky, and 

 New Jersey 442. M. tyrannus (Linn.). Fork-tailed Flycatcher. 



a 8 . Tail-feathers chiefly white; top of head ash-gray; axillars red or orange. Adult 

 male : Above light bluish gray, the back tinged with red ; lower parts white, 

 faintly tinged with bluish gray anteriorly, the sides, flanks, and under tail- 

 coverts strongly washed with salmon-pink ; axillars and concealed spot in 

 middle of crown scarlet; length about 12.00-15.00, wing 4.40-5.15, tail 



1 In " Contopus" (i.e., NuttallornU) borealU. 



