1873.] 87 [Ridgway. 



2. Tail deep, rather brownish, ash, not decidedly lighter than 

 the back ; the 3-4 black bands about equal to the gray 

 ones; jugulum plain brown, or rufous, in the adult, longi- 

 tudinally striped in the young. Lower parts yellowish 

 white, about equally barred with dull light rufous. Wing, 

 8.50-9.50; tail, 6.50-7.00; culmen, .75; tarsus, 2.20-2.50; 

 middle toe, 1.15-1.20. Hah. Eastern South America. 

 var. nattereri. 



3. Tail ash, decidedly lighter than the back, the 5-7 black 

 bands equal to, or scarcely narrower than, the gray ones ; 

 jugulum always variegated with whitish — transversely 

 spotted in adult, longitudinally striped in young. Lower 

 parts barred broadly with brown (varying from bright rufous 

 to plumbeous-umber). Wing, 8.70-10.00; tail, 6.30-7.50; 

 culmen, .75-.80, tarsurf, 2.35-2.50. Hah. Southern and 

 Middle Mexico var. griseocauda. 



JB. — Tail rufous, or much tinged with rufous. 



4. Black bands of tail nearly equal to, or only a little narrower 

 than, the deep rufous ones; jugulum never (?) longitudi- 

 nally striped, lower parts broadly barred with rufous. 

 Wing, 8.70-10.00; tail, 6.50-7.50; culmen, .75-.80; tar- 

 sus, 2.35-2.50; middle toe, 1.15-1.30. Hah. Region of 

 Isthmus of Panama (Panama to Guatemala). 

 var. rujicauda. 



5. Black bands of tail much narrower than the light rufous 



ones; jugulum always (?) striped longitudinally; lower 

 parts very narrowly barred. Wing, 9.40-10.70; tail, 7.00- 

 7.75; culmen, .65-.85; tarsus, 2.40-2.60; middle toe, 1.20- 

 1.35. Hah. Southern half of South America. 



var. pucJierani. 



a. var. magnirostris Gmel. 



L'epervier a gros hec de Cayenne Buff., PI. Enl., 464. 



Falco magnirostris Gmel., S. N. I, 282. 



Nisus magnirostris Tschudi, F. P., Aves, p. 104. 



Rupornis magnirostris Cab., in Schomb. Guian. in, 737. 



Asturina magnirostris Sclater, P. Z. S. 1857, 261; 1858,451; 1859, 

 147; 1860, 288.— Scl. and Salv., P. Z. S. 1866, 198; 1867, 589, 

 753; 1869, 131. 



Astur macrorhynchus Pelz., Orn. Bras., p. 6; iv., 463. 



Falco insectivorus Spix, Av. Bras., I, 17, t. 8 a (parthri). 



