482 PROCEEDINGS OF THE ACADEMY OP 



5. Wing, 6.60-7.10 ; tail, 7.30-7.80 ; tarsus, 2.30-2.45 ; middle toe, 1.15- 

 1.30. Adult {plumbeous phase): Above light plumbeous, the wings 

 browner. Tail crossed by four bars of white ; throat light gray ; 

 jugulum more or less washed with light rufous; entire lower parts 

 barred with white and plumbeous. Rufous phase : Above rusty 

 brown, becoming more plumbeous on the crown ; neck and entire 

 jugulum light rufous. Tail crossed by 4-5 bars of white. Young 

 (plumbeous phase): Above grayish-brown or umber; tail crossed by 

 6-8 bars of white spots ; throat white, with a half-crescent branch 

 behind the ear-coverts ; breast scarcely tinged with rufous. Rufous 

 phase : Above dark rufous or rusty chocolate, the crown darker and 

 more slaty. Tail crossed by 6-7 interrupted bars of white ; throat 

 and half crescent behind ear-coverts, white ; breast more or less 

 strongly washed with rufous. Eastern South America, south to a 

 little beyond latitude 10 South (Sharpe); Venezuela and Guiana 

 (Sharpe). M. ruficollis. 



6. Wing, 6.50 ; tail, 6.30 ; culmen, .60 ; tarsus, 2.30 ; middle toe, 1.20. 

 Adult (plumbeous phase) : Tail crossed by two bars of whitish or pale 

 brownish-gra3 r . Above uniform dark plumbeous, the tail darker and 

 the wings browner. Throat light-gray ; rest of lower parts white, 

 marked everywhere with very narrow bars of dark plumbeous, these 

 bars very narrow and distinct on the flanks and crissum. Peruvian 

 Amazons. M. pelzelni. 



B. Outer toe not longer than the inner. (Fig. 9.) 



Fie:. 9. 



M. concentricus. Nat. size. 



/. Tail shorter than the wing. Wing, 7.10-7.75 ; tail, 6.30-7.00 ; culmen, 

 .60 ; tarsus, 2.25-2.45 ; middle toe, 1.00-1.08. Adult : Tail crossed by 

 1-4 narrow bars, or lines, of white. Above dull plumbeous, the tail 

 darker and the wings browner. Throat grayish-white ; other lower 

 parts white, the crissum, anal region, and lining of the wing, and 

 sometimes the flanks and tibia;, immaculate ; the other portions barred 

 with plumbeous. Tropical South America. M. concentricus. 



1. MlCRASTtTR MELANOLETJCTJS. 



Sparrius melanolcucus, Vicill., Nouv. Diet. Hist. Nat., x, 1817, 327 ; 



Enc. Moth., 12liT. [Adult,] 

 tficrastur semitorquatus, Scl. and Salv., Ibis, 1839, 218; Pr. Zool. Soc. 



Lond., 1869, 365; Norn. Av. Neotr., 1873, 120. Strickl., Orn. Syu., 



I, 1855, 122. Lawr., Ann. N. Y. Lye, VII, 1862, 8 ; IX, 1868, 134; 



Mem. Boston Soc, N. H., II, 1874, 299. Salvin, P. Z. S., 1870. 



