145 



MORAXT. A regular but rather uucommou migrant and sometimes a 

 winter resident. 



290 ff. Var. floridanus And. Florida Cormorant. A regular 

 summer resident in Southern Illinois, occasionally straying to the 

 northern portion of the state. A specimen of this variety was ob- 

 served in May, 1876, at Waukegan. I do not think G. carbo occurs in 

 this vicinity. 



Family LARID^. 

 Genus Stercorarius Briss. 



291. S. pomatortiinus Vieill. Pomarine Jaeger. A rare win- 

 ter visitant to Lake Michigan. It was first observed by Mr. F. L. Kice 

 near Evanston and upon the strength of this introduced to the fauna 

 of the state. I am happy to record a second instance of Its occur- 

 rence near flhicago, October 9th, 1876, when I observed a fine adult 

 specimen flying along the Lake shore, and so near that there could be 

 no possibility of mistake. 



Genus Larus Linn. 



292. L. glaucus Br'dnn. Glaucus Gull. A rather rare winter 

 visitant to Lake Michigan. Dr. Hoy has killed three specimens upon 

 the Lake near Ilaciue, one of which is now preserved in his collection. 

 He has seen others during severe winters. 



293. L. leueopterus Fabr. White-winged Gull. A regular 

 and not uncommon winter resident on Lake Michigan. 



294. L. marinus Linn. Great Black-backed Gull. Not an un- 

 common winter resident vipon Lake Michigan. The immature young 

 are greatly in exc«ss of the adults. 



295. L. argentatus var. argentatus Brllnn. European Her- 

 ring Gull. Very rare winter visitant to the Lake. A single speci- 

 men, an adult female, vi*as obtained in the Chicago Harbor March 27, 

 1876. Dr. Cones records two other specimens of this form obtained 

 in this country, one in Mr. Lawrence's private cabinet and the other 

 in the Cambridge Museum (see B. of N. W., p. 628). The Illinois 

 specimen has been examined by Dr. Coues and Mr. Ridgway and, pro- 

 nounced by them to be identical with the European bird. The most 

 sti'iking peculiarit}^ is its small size and the white terminal space over 

 two inches long, upon the outer primaiy. The dimensions of my 

 specimen are as follows: length, 22-50; wing, 15'30; tarsus, 2-25; bill, 

 1-90. Iris hazel. 



295 a. Var. smithsonianus Coues. American Herring Gull. 

 Very abundant winter resident upon Lake Michigan, and occurs 

 throughout the state. Large numbers frequent the prairie near the 

 slaughter houses, in the vicinity of Chicago, where they find a gene- 



