200 U. S. NATIONAL MUSEUM BULLETIN 217 



Family STERCORARIIDAE: Jaegers, Skuas 



Stercorarius parasiticus (Linnaeus) 



1 male June 14 weight 579 g. little fat testes 12x20, 11x16 



mm. 



The only record of a parasitic jaeger was obtained from the specimen 

 brought to us. It seemed to be recognized by Joe Kay, who gave as its 

 Indian name Tfse hug. From the size of the testes it was in breeding 

 condition. 



It is to be suspected that these jaegers winter with the Pacific popu- 

 lation which ranges off shore as far north as southern California. 



Stercorarius longicaudus Vieillot 



1 male May 20 weight 313 g. fat testes 8x17, 8x13 



mm. 



Long-tailed jaegers were seen only above the tree line on Old Crow 

 Mountains, where the specimen listed above was shot. Six were re- 

 corded on May 27 on or over the sedge hummocks of the saddle between 

 the southern and central mountain. Judging from their actions they 

 had already paired and several pairs appeared to have settled upon 

 nesting localities. The testes of the specimen were about mature in size. 



It is to be suspected that this jaeger would have wintered with the 

 Pacific population off shore from South America south of latitude 

 10° S. 



Family LARIDAE: Gulls, Terns 



Larus hyperboreus barrovianus Ridgway 



Larus argentatus smithsonianus Coues 



1 male in adult June 11 weight 1435 g. very fat testes 10x12, 6x9 



plumage mm. 



1 female in sec- June 12 weight 1006 g. little fat egg 5 mm. 



ond nuptial 

 plumage 



It came as a surprise on May 15 to see overhead four adult glaucous 

 gulls flying swiftly eastward in compact formation close above the 

 trees at the edge of the steep bluff overlooking the mouth of Old Crow 

 River. Soon after another group of four appeared on the same 

 course, then five and again four, all within an hour. It became evi- 

 dent that their course along the bluff gained advantage from a local 

 wind condition by which their eastward flight was favored in the 

 prevailing northeasterly wind, for the gulls lost speed in the turbulent 

 air as they rounded the point. Then they found a northerly course 

 with favoring wind conditions, resumed speed, and disappeared up 

 Old Crow River. 



