106 ZOOLOGICAL RESEARCHES. 



this duck , was a forest of high mangrove- and other trees 

 at the head of the Junk River near the Old Field. Nearly 

 every time , I passed this forest by canoe , I saw two or 

 more, sitting on some overhanging branches of trees, and 

 only once I found a couple swimming, retiring however to 

 their elevated sitting places as soon as they beared the 

 noise of our canoe. 



147. Sterna can tia c a, Gm. 



Butt. N. L. M. 1885, p. 249; id. 1886, p. 267. 



One specimen killed at Marshall , near the mouth of 

 the Junk River. Also observed at Grand Bassa and River Cess. 



148. Hy drochelidon nigra (Briss.). 

 Butt. N. L. M. 1885, p. 250; id. 1886, p. 267. 



Very large flocks I found near Fish Town, Grand Bassa, 

 on the sand-banks before the mouth of the Bissaw River. 



149. Stercorarius cephus (Brünn.). 



Butt. N. L. M. 1886 , p. 267. 



An adult live specimen obtained short before my return 

 at Monrovia. 



150. P lotus levaillantii, Licht. 



Butt. N. L. M. 1885, p, 251; id. 1886, p. 268. 



Several specimens, sitting on Pandanus- and Mangrove- 

 bushes along the Junk River. 



151. G r aculu s africanus (Gm.). 



Butt. N. L. M. 1885, p. 252. 



In the same localities as the foruier. Also observed on 

 all the rivers I visited lower down the coast. 



Notes from the Leyden TVLuseum, Vol.. X.. 



