Perching Birds Chiefly Dull Colored. 
472. Beardless Flycatcher (Oruthion imberbe). 
L. 4.5; W. 2.10. Ads. Bill small, narrow, upper 
mandible decidedly curved; above gray tinged with 
olive, below grayish white with a yellow tinge. 
Range.—Central America; north In spring to Lower Rio Grande: 
Texas. 
472a. Ridgway Flycatcher (O. 7. ridgwavi). Sim- 
ilar to No. 472, but larger, W. 2.2; grayer, little if any 
sulphur tinge on underparts. (Ridgw.) Notes. Call, 
a shrill peér repeated; song, from the tree-tops, yoop, 
yoop, yoopecdeedledee. (Stephens.) 
Range.— Southern border of Mexican tableland north in spring to 
southern Arizona. 
616. Bank Swallow (Ritaria riparia). L. 5.2. Ads. 
Below white, a broad grayish brown band across the 
breast; above grayish brown. Yung. Similar, but 
brown areas more or less tipped with rusty. 
Range.— Northern hemisphere: in America, breeds from northern 
New Jersey, Kansas, and southern California, north to Labrador, and 
Alaska; winters south to Brazil. 
617. Rough-winged Swallow (Stelgidopteryx serri- 
pennis). L. 3.5. Ads. Above grayish brown; below 
grayish white, whiter on belly; barbs on outer vane of 
outer primary recurved. Yxg. Plumage more or less 
tipped with rusty. 
Range.— United States; breeds from Mexico north to Massachusetts, 
Manitoba, and British Columbia; winters in Central America. 
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