Widmann — A Preliminary Catalog of the Birds of Missouri. 25 



In Missouri the Herring Gull is a transient and winter visitant, 

 most common in early spring and in fall from October 20 to 

 November 20. On the Mississippi and lower Missouri Rivers 

 it may be seen from September 20 to May 5 in varying numbers, 

 leaving us entirely only when the rivers are frozen and returning 

 with the breaking up of the ice. It frequents the lower Missouri 

 River, but is rare in the western part of the state. 



54. Larus delawarensis Ord. Ring-billed Gull. 



Larus zonorhynchus Richards. Common American Gull. 



Geog. Dist. — North America at large, but chiefly in the in- 

 terior. Breeds from the northern United States northward and 

 winters coastwise from British Columbia and Long Island south- 

 ward, also on the Lower Mississippi and in the Gulf States. 



In Missouri the Ring-billed Gull is a common transient visitant 

 in March and April, October and November. It is much more 

 common in western Missouri than the Herring Gull. 



59, Larus franklinii Sw. & Rich. FrankUn's Gull. 



ChroicocephcUus franklini. Franklin's Rosy Gull. 



Geog. Dist. — Interior of North America, migrating chiefly 

 west of the Mississippi River, and breeding from northern United 

 States northward, mostly in the prairie region of Manitoba and 

 Assiniboia. Winters from the mouth of the Mississippi south- 

 ward through Mexico and Central America to Peru. 



In Missouri formerly a regular transient visitant throughout 

 April and in October and November; now rarely seen in the 

 eastern part of the state. 



60. Larus Philadelphia (Ord). Bonaparte's Gull. 



Larus bonapartei. Chroicocephalus Philadelphia. 



Geog. Dist. — ^Whole of North America, breeding north of the 

 United States, mostly in the wooded region from Hudson Bay to 

 the Yukon marshes and British Columbia. In winter from our 

 southern states to western Mexico. 



In eastern Missouri a regular transient visitant, formerly com- 

 mon, the latter part of March and early in April, and through 

 October. 



62. Xema sabinii (Sab.). Sabine's Gull. 



Larus sabinii. Fork-tailed Gull. 



Geog. Dist. — ^Arctic regions. In North America south in 



