108 



Family STERCORARIID.E. 8kuas and J.egers. 



Genus STERCORARIUS Brisson. 



3. Stercorarius parasiticus (.Linn.). PxRisiric J.eger. 



Illinois (Bull. Null. Orn. Club, Vol. V, p. 31). 



Family LARID.E. Gulls and Teens. 

 Subfamily LARIX.E, Gulls. 



Gknus RISSA Stephens. 



4. Eissa tridactyla (Linn.). Kittiwake Gull. 



Illinois and Wisconsin, rare winter visitor (Nelson N. E. III., p. 146); Ohio, 

 rare winter visitor (Wheaton, p. 549) ; Michigan, rare (Gibbs, p. 495). 



Genus LARUS Lixn.eus. 



5. Larus marinus J-inn. Great Black-backed Gull. 



Illinois, winter resident (Nelson, N. E. Hi., p. 145); Ohio, rare winter visitor 

 (Wheaton, p. 547); Michigan, rare (Gibbs, p. 49i). 



6. Larus argentatus Brnnn. Herring Gull. 



Illinois, rare winter visitor (Nelson, N. E. II!., p. 145). 



7. Larus atricilla Linn. Laughing Gull, 



Illinois, rare summer visitor southward (Ridgway Cat., p. 202); Michigan, 

 abundant (Gibbs, p. 495). 



r 

 Genus XEMA Leach. 



8. Xenia sabinii {Sab.}. Sabine's Gull. 



Illinois, rare winter visitor to Lake .Michigan (Ridgway Cat., p. 202); Ohio, 

 accidental on Lake Erie (Wheaton, p. 662). 



Subfamily STEKNIN.E. Tkrns. 



Genus GELOCHELIDON Brehm. 



9. Gelochelidon nilotica iUumtlii.). Gull-billed Tern. 



Illinois, rare summer visitor (Ridgway Cai., p. 202) ; Ohio, rare visitor north- 

 ward (Wheaton, p 552) ; Michigan, not rare summer visitor (Gibbs, p. 496). 



Genus STERNA Linn.eus. 

 Subgenus Thalasseis Bole. 



10. Sterna tschegrava Lepich. Caspian Tern. 



Illinois, winter visitor (Ridgway Cat., p. 202); Michigan, accidental (Gibbs, 

 p. 495). 



Subgenus Actochelidon Kaup. 



11 Sterna maxima fiodrf. Royal Tern. 



Illinois and Wisconsin, summer visitor i Ridgway, p. 202) ; Michigan, rare 

 summer visitor (Gibbs, p. 495). 



