BIRDS OF SOUTH DAKOTA 91 



water for its food, as do other members of the genus. It is not 

 known to breed here, though it has been reported as breeding 

 along Vermillion river in the adjoining county. 



9. Black Tern. Hydroch&Udon nigra surinamensis. A 

 common summer resident (Allen, Ludcke) ; but certainly rather 

 scarce in 1918 (Stephens). 



10. Double-crested Cormorant, Phalacrocorax auritus. 

 Seven were noted on Goodenough lake on April 14, 1918 (Allen, 

 Ijudcke, Hayward, Stephens) ; five again noted in same locality 

 May 1, 1918 (Anderson, Stephens) ; four again noted in same 

 place on May 5, 1918 (Allen) ; all probably of the same flock. 



11. White Pelican, Pelecanns erythrorh>,ijn€]tos. A very 

 common migrant. On April 15, 1917, two immense flocks were 

 seen in flight over Goodenough lake, and were variously esti- 

 mated to contain from 300 to 500 individuals each (Allen 

 Ludcke, Stephens). They were very numerous in the spring 

 of 1918, and four flocks aggregating seventy-five individuals 

 were seen as late as June 2. 



12. American Merganser. Mergus americanus. Mr. Ander- 

 son has mounted two specimens on the following dates, both 

 shot at McCook lake; one on October 2, 1912, and the other on 

 the following day. Mr. Ludcke also saw a fiock of about a dozen 

 on Goodenough lake on March 24, 1918. 



13. Mallard. Avas platyrhynchos. A very common species, 

 and has apparently increased some in the last three years. 



14. Black Duck. Anas rxibripes. An uncommon species. 

 On iMarch 2, 1904, Mr. Anderson mounted one for Dr. Rich. 

 Upon inquiry the following statement was elicited from Dr. 

 Rich concerning this specimen: "The Black Duck was shot by 

 Chas. Sang-ster on the Missouri river near the mouth of the Big 

 Sioux, but probably ofl' the banks of South Dakota. He had a 

 camp a few miles above the mouth of the Big Sioux, and hunted 

 along the Missouri and also about McCook lake. The sex was 

 not given in my records." 



15. Gadwall. Clundelasmus streparns. The writer has 

 seen this species at McCook lake both dead and alive. It is 

 only a tolerably common migrant, known by the hunters as the 

 Grav Duck. 



