34 THE CHICAGO ACADEMY OF SCIENCES. 



Hydrochelidon lariformig (part) CouES, B. N. W., 1874, 704 (neo 



Rallus lariformis Linn^us). 

 Popular synomyms: Shoet-tailed Teen. Black Swallow. 



A common summer resident in Cook County, breeding in 

 colonies on all of our marshy lakes, and at times on tha wet 

 meadows near a body of water. Mr. B. T. Gault writes me that 

 this species is rare in Du Page County, he having but one record 

 of its occurrence. It arrives about the middle of May and 

 departs the last of August. 



The nest of this tern is a small cup of dead vegetation and 

 is placed upon an old muskrat house or a dry spot on the boggy 

 ground. It is quite difficult to locate the nest except by watching 

 the birds, for the eggs closely resemble the ground in color. 



The Black Tern is a bird of temperate and tropical America, 

 ranging from Alaska to Brazil, and breeding f • om the middle 

 United States northward. 



ORDER STEGANOPODES: TOTIPAL- 

 MATE SWIMMERS. 



FAMILY PHALACROCOROCID^: CORMORANTS. 

 Genus PHALACROCORAX Brisson, 1760. 



Fhalacrocoraz dilophus (Swains.). Double-crested Cormorant. 



Pelecanus (Carlo) dilophus Swains., in Sw. & Rich. F. B. A., II, 



1831, 473. 

 PhalacrocortUD dilophus Nuttall, Manual, II, 1834, 483. 

 Graculus dilophus Gkat, Gen. B., Ill, 1849. 

 Graculus dilophus a. dilophus CouES, B. N. W., 1874, 587. 

 Popular synonyms: Ceow Duck. Black Loon. Niggeb Goose. 



A rather rare fall visitant in our district. I have seen them 

 frequently on Lake Calumet. One was shot' on the Little Calu- 

 met River at Liverpool, Indiana, on October i6, 1896. A young 

 bird was shot from the government pier at Chicago, September 

 28, 1897, by Mr. George H. Sheridan and presented to the 

 museum of The Chicago Academy of Sciences. Mr. E. W. Nel- 

 son says : "A regular but rather uncommon migrant and some- 

 times a winter resident." 



Its breeding range extends from the Bay of Fundy, the Great 

 Lakes, Minnesota and Dakota northward, and the birds winter 

 in the southern states. 



