ROUGH-WINGED SWALLOW. 595 
proved exceedingly difficult to exhibit in an engraving the peculiar 
character presented by the outer quill, unless it were much magnified. 
The specific characters of these two Swallows, so nearly allied, are 
as follows :— 
Hirundo riparia. Tail, Fig. 1, slightly forked, margin of first quill 
smooth, tarsus with a tuft of feathers behind ; upper parts greyish- 
brown, lower whitish, with a dusky band across the fore part of the neck. 
Hirundo serripennis. Tail, Fig. 2, slightly emarginate, margin of 
first quill, Fig. 3, rough with the strong decurved tips of the barbs, 
tarsus bare; upper parts greyish-brown, lower pale greyish-brown, 
white behind. 
Tig. 1. Fig.2. 
\ \ f\ f )» ’ ( , I 
In its general appearance, including proportions as well as colour, 
the Rough-winged Swallow is extremely similar to the Bank Swallow. 
It differs however in having the bill considerably longer, more attenu- 
ated toward the end, with the point of the upper mandible more de- 
curved. The tail, Fig. 2, is shorter and but slightly emarginate, the 
- lateral exceeding the middle feathers by only two-twelfths of an inch, 
whereas in the other species they exceed them by five-twelfths or even 
six; feathers are also broader and more rounded at the end. The wings 
are longer, and extend half an inch beyond the tail. The tarsi and 
