100 



A. L. V. Manniche. 



The number of chicks in a brood varied from 3 to 7. 



In the river some 50 old males were continually to be seen; at 

 the end of August some of them still had their primaries so little 

 developed, that they were very far from being able to fly. At regu- 

 lar intervals the birds swam to the mouth of the river and a little 

 way out in the bay; from here they returned after some hours and 

 rushed in a close crowd up the river, to the beaches of which they 

 would always retire for the night. In August 1907 I visited "Hval- 

 rosodden" again and found just as many males in moult as I did 

 the preceding year. 



Some flocks of younger non-moulting and non-breeding birds 

 had settled off the mouth of the river and in the bay. These birds 

 would often fly far and wide, sometimes as far as the shores of 

 Dove Bugt. I also met with them up the river sometimes in com- 

 pany with the old males. The last Longtailed-Duck was seen Sep- 

 tember 18'h. 



In the beginning of summer this species will almost exclusively 

 stay in the fresh waters and then its food is of very different kind. 

 In the stomachs of birds killed at this season I sometimes found 

 remnants of plants. The food however, seemed essentially to con- 

 sist of insects and larvæ; one stomach contained exclusively larvæ 

 of gnats. In the stomachs of two downy young I found only small 

 stones. 



When feeding in salt water they mainly eat mussels and small 

 crustaceans; this has been proved by numerous examinations of 

 stomachs. For the zoological museum in Copenhagen were collected 

 the skins of 4 old birds. Further 3 old birds and 4 downy young 

 in spirit and 1 egg. 



The following measurements have been taken: 



