32 The Ornithology of Chester County 
men found dead in a field, was presented to Dr. 
Warren; and this, with a later capture, remain in 
his collection. 
14. Hydrochelidon nigra surinamensis Black 
Tern. Straggler. Two specimens, male and fe- | 
male, were taken by Titus Bennett, of West Ches- 
ter, in the fall previous to 1879; and this pair, with 
another collected in the spring; are in the collec- 
tion of Dr. Warren. Another was killed in the 
fall two or three years ago (Warren MS.). 
15. Puffinus gravis Greater Shearwater. Strag- 
gler. This powerful bird, despite its strength and 
endurance of wing, was storm-stranded within our 
borders and perished during a severe storm of wind, 
rain and sleet (Michener, Hist. Chester Co., Pa., 
1881, 445). Sole State record. 
16. Oceanodroma leucorhoa Leach’s Petrel. Strag- 
gler. A specimen was presented to Dr. Warren in 
September, 1879, by the late Dr. George Martin of 
West Chester, who had found it in his yard in an 
exhausted and dying condition (Bds. Pa., 1890, 27). 
Sole State record. 
17. Mergus americanus Merganser, “fish duck,” 
“sawbill.” Rare winter visitant and occurs oc- 
casionally as a transient. Listed by Barnard, War- 
ren, Michener and Pennock. A flock of seven 
attempted to winter, 1910-1911, at the Valley Forge 
dam; but were reduced to three by Jan. 12, and 
a dead and water soaked female was found Jan. 15 
(No. 982, coll. F. L. B.). It is also recorded by 
Mrs. H. P. Brinton, West Chester, Mar. 18, 1914 
(Cass., xvill, 51). 
