202 Catalogue of the Birds of Illinois. 



Older GAVI^:. 



Family LARID^.— Gulls and Terns. 



Genus RissA, Leach. 



316. R. tridactyla (Linn.) Bp. Kittiwake Gull. Winter visitant to Lake 

 Michigan. 



Genus Larus, Linnseus. 



317. L. glaucus,'Qxunn. Glaucous Gull. Winter visitant to Lake Michigan. 



318. L, leucopterus, Fabr. Winter sojourner on Lake Michigan. 



319. L. marlnus, Linn. Great Black-backed Gull. Winter visitant to 

 Lake Michigan. 



320. L. argentatns,'B'c\\x\n. European Herring Gull. Rare (or accidental ) 

 winter visitant to Lake Michigan (see Nelson, p. 145). 



*320«. L. argenfatus smithsonianus, Coues. American Herring Gull. 

 Winter sojourner throughout the state. A few remain in summer, on or near 

 the larger bodies of water, but probably do not breed in our limits. 



321. L. delatrarensis, Ord. Ring-billed Gull. Mainly transient, but 

 winter sojourner southward, and rare summer sojourner (but not breeding ?) 

 northward. 



322. L. atricilla, Linn. Laughing Gull. Rare summer visitant southward. 



323. L.franklim, Sw. & Rich. Franklin's Gull. Transient. 



324. L. 2MladelpMce {0\:^.) (jvd^y. Bonaparte's Gull. Chiefly transient, 

 but sometimes wintering, while a few apparently remain in summer in certain 

 localities. 



Genus Xema, Leach. 



325. X. 8a&me« (J. Sabine) Leach. Fork-tailed Gull. Rare winter visitant 

 to Lake Michigan. 



Genus Stekna, Linnseus. 



326. S. angllca, Montag. Marsh Tern. Rare summer visitant. 



327. S. caspia, Pall. Caspian Tern. Winter visitant. 



328. S. regia, Gamb. Royal Tern. Summer visita,nt. 



*329. S.fluviatilis, Naum. Common Tern. Mostly transient; abundant 

 in suitable places, especially northward, where a ^qw breed. 



*330. S. forstev'u'Ru.tt. Forster's Tern. Summer sojourner. 

 331. S. rt«^(7Zflriurt (Less.) Coues. Least Tern. Summer visitant. 



Genus Hydrochelidon, Boie. 

 *332. //. lariformis snnnamensis (Gmel.) Ridgw. Black Tern. Summer 

 sojourner. The most numerous and generally diffused species of the family. 



Family STERCORARIID^.— The Skuas and Jaegers. 

 Genus Stercorarius, Brisson. 



333. S. pomafor-hhms (Tcmm.) Pomarine Jaeger. Winter visitant to Lake 

 Michigan (Nelson, p. 145). 



334. S. iMrasiticus (Linn.) Saunders. Long-tailed, or Buffon's Jaeger. 

 Casual winter visitant. (See Bull. Nutt. Orn. Club, January, 1880, p. 31.) 



