BIRDS OF NORTH AND MIDDLE AMERICA. 281 



h. Secondaries with exposed portion longer than exposed portion of 

 greater wing-coverts; rectrices and tail-coverts extremely broad; 

 bare orbital space smaller, without papillose outer ring. 



Pieazarus (extralimital). a 



hh. Secondaries with exposed portion shorter than exposed portion of 



greater coverts; rectrices and tail-coverts moderate in width; 



bare orbital space much larger, with a conspicuous papillose 



outer ring Crossophthalmus (p. 320). 



ee. Tail longer (more than three-fourths as long as wing); feet relatively 

 smaller, the toes more slender; outermost primary shorter than fifth 



(from outside) (Encenas(p. 323). 



cc. Tail as long as or longer than wing, strongly graduated, the rectrices tapering 



terminally, pointed at tip. (Ectopistese.) Eetopistes (p. 333). 



56. Middle toe (without claw) lesB than five-sixths as long as tarsus, the latter 

 with upper part entirely bare, 

 c. Tail crossed by a post-median band of black (sometimes obsolete on middle 

 rectrices); a subauricular spot or Btreak of black. (Zenaidas.) 

 d. Wings more or less spotted with black, the distal coverts not white. 

 e. Rectrices 14, the tail more than three-fifths as long as wing; tarsus less than 

 one-sixth as long as wing; bill not decurved; smaller wing-coverts im- 

 maculate; a black subauricular spot, but no pale auricular stripe. 

 /. Tail longer and more graduated (nearly three-fourths as long as wing to 



longer than wing) Zenaidura (p. 339). 



ff. Tail shorter, rounded rather than graduated (less than two-thirds as long 



as wing): Zenaida (p. 354). 



ee. Rectrices 12; the tail less than three-fifths as long as wing; tarsus nearly 

 one-fifth as long as wing; bill decurved; smaller wing-coverts spotted 

 or streaked; no subauricular spot, but a pale auricular band margined 



above and below by a black line Nesopelia (p. 372). 



dd. Wings immaculate, the distal coverts white Melopelia (p. 376). 



cc. Tail without a black cross-band; sides of head and upper neck immaculate. 

 d. Larger (wing not lesB than 140 mm.) ; culmen two-thirds as long as tarsus, the 

 latter less than one-seventh as long as wing; tail more than two-thirds as 

 long as wing, extensively white apically (except on middle rectrices); 



a black band across nape Streptopelia (p. 385). 



dd. Smaller (wing less than 135 mm.); culmen less than two-thirds as long as 

 tarsus, the latter nearly one-sixth as long as wing; tail less than two-thirds 



as long as wing, wholly black Metriopelia (extralimital).& 



aa. Wing relatively shorter and more rounded, the longest primaries exceeding distal 

 secondaries by not more (usually less) than one-third the length of wing. (Sec- 

 ondaries eutaxic=quintocubital, except in Leptotila,Geotrygon, and Oreopeleia.) c 



"■ Picazurus Des Murs, in Chenu Enc. d'Hist. Nat., Ois., vi, 1854, 39; type, by 

 tautonymy, Columba pkazuro Temminck. (Southern Brazil, Argentina, Paraguay, 

 Bolivia, Peru, etc. ; two species.) 



6 Metriopelia Bonaparte, Compt. Rend., xl, 1855, 23; Consp. Gen. Av., ii, 1857, 75; 

 type, Columba melanoptera Gmelin. — Metriopeleia (emendation) Reichenbach, Volls. 

 Naturg. Columbariae, i, 1861, 17. (Ecuador to Chile and Argentina; two species, 

 of which M. aymara has not been examined.) 



c This character assumed for Nesopelia, Melopelia, and Metriopelia, which have not 

 been examined with reference to the character in question. 



