86 The Ornithology of Chester County 
bellied swallow.” Not common transient, and pos- 
sibly a rare summer resident. Michener, Warren 
and Pennock considered it common, but Mont- 
gomery found it unfrequent, taking two specimens 
and observed two others on Apr. 25, 1891, by the 
Brandywine, and saw another three days later in 
West Goshen. 
Dr. Warren informed me that he had observed 
several along the Brandywine, several times during 
the summer of 1889. Arrives Apr. 17 (1914)— 
Apr. 25 (1891). 
172. Riparia riparia Bank Swallow, ‘‘sand swal- 
low.” Not common transient. Apr. 25 to May 2, 
according to Barnard. Although this species has 
been known to breed in large colonies in the adjoin- 
ing counties, and there are numerous local reports 
of its presence and nesting; I have been unable to 
confirm a single one with specimens, and neither 
Stone nor Montgomery found it nesting. However, 
if we are to credit the statements of Audubon, 
Michener and others, it was formerly a common 
summer resident along the Schuylkill, Brandywine, 
and other parts of the county; now apparently large- 
ly or altogether displaced by S. serripennis. 
173. Stelgidopteryx serripennis Rough-winged 
Swallow, “bank swallow,” “bridge swallow,” “‘sand 
martin,” “sand swallow.” Common summer resi- 
dent, especially along the Schuylkill and Brandy- 
wine. Nesting data: Chester valley, June 3, 1895, 
five eggs. Migration data from all sources: 
Arrival—Apr. 18 (1908)—May 13 (1909); 
ave. 7 yrs. Apr. 30. 
