592 . BANK SWALLOW. 
greyish-brown ; the quills brownisl-black, the outer very faintly, the 
inner broadly margined ; the tail-feathers greyish-black, edged with 
greyish-white. The lower parts are white, the throat faintly streaked 
with dusky ; the band across the breast, and the sides, coloured as in 
the adult, but darker. 
On very carefully comparing skins of this Swallow, with a series of 
those of the Bank Swallow of Europe, procured for me by my esteemed 
friend, ‘Tuomas Duruam Weir of Boghead, Esq. an enthusiastic and 
successful observer of the habits of birds, I can perceive no difference 
whatever. Old birds compared with old, and young with young, prove 
perfectly similar. There is, however, another species closely allied to 
the present, and which might very readily be confounded with it. This 
species, to which I give the name of Rough-winged Swallow, Hirundo 
serripennis, | consider it expedient to describe, although it has not as 
yet been figured by me. ‘ 
In a male of the present species, from Boston, the palate is flat, the 
mouth very wide, measuring 5 twelfths across. The tongue is short, 
triangular, 2} twelfths long, deeply emarginate and 
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papillate at the base, two of the lateral papilla much 
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larger than the rest, the tip bluntish and slightly slit. 
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The cesophagus, adc, is 1 inch 9 twelfths long, nar- 
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row, 2 twelfths in diameter, without crop or dilata- 
tion. The proventriculus, 6, is little enlarged. The 
stomach, cdef, a gizzard of moderate length, with dis- 
tinct lateral muscles, and of an elliptical form, is 
half an inch long, and 5 twelfths broad ; its epithe- 
lium longitudinally rugous, tough, and light red. It 
is filled with remains of insects. The intestine, fg h, 
is 53 inches long, its greatest diameter 14 twelfth ; 
the coeca very small, being 14 twelfth long, and 4 
twelfth in diameter, their distance from the anus 9 
twelfths. There is no essential difference between 
the digestive organs of this and other swallows, and the Flycatchers,, 
Warblers, and other slender-billed birds. 
The trachea is 1 inch 4 twelfths long, slender, flattened, of about 
55 unossified rings. The contractor and sterno-tracheal muscles are 
slender ; and there are four pairs of inferior laryngeal muscles. 
