92 PROCEEDINGS OF THE ACADEMY OF 



slate; secondaries slate-gray, tipped with white. Wing, 

 15.00-18.10; tail, 9.00-10.50; culmen, 1.00; tarsus, 3.25-3.55 ; 

 middle toe, 1.50-1.90. Hab. Chile, Patagonia, Tierra del 

 Fuego, and Falkland Islands. 



3. C. erythronotus. Adult. Above plumbeous, below white. 

 % Above entirely uniform plumbeous. 9 . Back and scapu- 

 lars bright rufous. Wing, 14.25-18.50; tail, 7.30-10.00; 

 culmen, .80-.100 ; tarsus, 2.95-3.50 ; middle toe, 1.30-1.50. 

 Hab. From Peru southward along the Pacific slope of South 

 America to the Falkland Islands. 



4. G. albicaudatus. Adult. Above dark plumbeous ; rump 

 and lower parts white ; throat, plumbeous-black. % . Lesser 

 wing-coverts with a very restricted patch of rufous along 

 the anterior edge ; longer scapulars, distinctly tinged with 

 rufous. 9 . Rufous patch on lesser coverts extended over 

 nearly the whole area of the region ; longer scapulars scarcely 

 tinged with rufous. Wing, 14.50-18.50 ; tail, 5.50-10.50 ; 

 culmen, .95-1.05; tarsus, 3.30-3.70; middle toe, 1.55-1.80. 

 Hab. Eastern South America, from Paraguay to Columbia ; 

 both sides of Middle America, from Panama northward to 

 Colima, City of Mexico, and Mirador. 



c. Tail grayish-brown, sometimes with a hoary cast, crossed by 

 about nine or ten very indistinct narrow bars of dusky. 



5. C. sivainsoni. Above nearly uniform dusky-brown ; be- 

 neath sometimes wholly uniform dark chocolate-brown, or 

 sooty-brown, but usually with a white throat patch, a uni- 

 form brown (9) or rufous (% ) pectoral area, behind which 

 the ground color is lighter, usually with transverse bars or 

 spots of darker shades of brown or rufous. Wing, 12.00- 

 17.25; tail, 8.00-9.80; culmen, .80-.95 ; tarsus, 2.30-2.90; 

 middle toe, 1.40-1.70. Hab. North America, except the 

 eastern forest district ; in winter migrating southward 

 through Middle and South America as far as Patagonia. 



B. Wing short, the tips of the primaries reaching only to the 



middle of the tail. Tail of young crossed by only five to seven 



wide bars of dusky. Size small (wing less than 12.00 inches). 



//. Tail of adult black, crossed by two to four wide bands of 



light brownish-gray or brownish-white (the last broadest) 



and narrowly tipped with white. 



