The Birds of Wyoming. 27 



GULLS AND TERNS. 



40. Rissa tridactyla (Linn.). 

 Kittiwake. 

 Accidental and very rare. The Wyoming record is based 

 upon a single specimen taken at Douglas by Dr. Jesurun, Nov. 

 18, 1898. This bird has also been taken in Colorado and oc- 

 casional stragglers may be looked for. 



51a. Larus argentatus smithsonianus CouEs. 

 American Herring Gull. 

 Migratory; very rare. The only Wyoming record comes 

 from Mr. Bond, who has taken a specimen at Cheyenne. 



54. Larus delawarensis Ord. 

 Ring-billed Gull. 

 Summer resident ; but not common. Common during mi- 

 gration. Breeds on the Laramie Plains. This is the common 

 gull of the state and during migration is found in considerable 

 numbers. Dr. Jesurun reports it as common at Douglas. Bond 

 has found it common at Cheyenne. Williston found it com- 

 mon at Como lake from early spring until the middle of June. 

 Grinnell reports it common on Yellowstone lake in 1875. The 

 specimens in the University collection were taken from the Lar- 

 amie Plains. Wood took a specimen on the Laramie river July 

 23, 1857- 



60. Larus Philadelphia (Ord.). 

 Bonaparte's Gull. 

 Migratory ; rather rare. Wood took one specimen on 

 July 23, 1857, on the Laramie river, which would lead one to 

 "believe that they occasionally breed within the borders of the 

 state. Williston reports a dozen of these birds, seen at Como 

 lake, May 2 to 17th, 1879. Bond has taken one specimen at 

 Cheyenne and has records of several others. West, of Buffalo, 

 had one specimen mounted in his collection that had been killed 

 near Buffalo. There are ten specimens In the University col- 



