1898.] NATURAL SCIENCES OF PHILADELPHIA. 131 



38. Sterocrarius longicaudus. Long-tailed Jaeger. 



This species could be seen at almost any time from July to Sep- 

 tember. They were abundant all along the coast from Icy Cape to 

 Herschel Island, N. W. T. They were abundant at Point Barrow 

 and seemed to be engaged chiefly in making life sorrowful for the 

 gulls. I noticed, however, that the big Glaucous Gull turned the 

 tables, and was frequently seen to chase the Jaegers. One adult 

 male was taken at Icy Cape, August 3d (No. 3,560 Stanford Uni- 

 versity). This specimen gives the following measurements : Wing, 

 13.5 ins. ; culmen, 1.27; cere, .75 ; tarsus, 1.75; mid-toe and claw, 

 1.65. Hab., northern parts of northern hemisphere, breeding in 

 Arctic regions, south in winter to California. 



LARID.2E. 



40. Rissa tridactyla pollicaris. Pacific Kittiwake. 



This beautiful bird was frequently observed in Bering Sea as far 

 north as Icy Cape, Alaska. Like the genus Larus, they have the 

 habit of following the vessel and watching for any food that may 

 be thrown over the side. They were most abundant off St. Law- 

 rence Island, July 1st. Two were shot at Icy Cape August 3d, 

 (see Nos. 3,563, 3,564 L. S. J. U.). Hab., coasts and islands of 

 Bering Sea north to Icy Cape. 

 40a. Rissa brevirostris. Red-legged Kittiwake. 



This species was more abundant than the preceding, especially in 

 the vicinity of the Aunamak Pass. Two specimens taken on St. 

 George Island July 26, 1897, give the following measurements: No. 

 3,530 Stanford University ; wing, 12.25 ins. ; culmen, 1.12 ; depth of 

 bill at nostrils, .45 ; tarsus, 1.12; mid-toe and claw, 1.76; No. 3,518 

 Stanford University : wing, 11.75 : culmen, 1.05 : depth of bill at 

 nostrils, .45; tarsus, 1.10; mid-toe and claw, 1.70. Feet and legs, 

 bright red, bill, greenish-yellow. Hab., coasts and islands of Ber- 

 ing Sea. 



42. Larus glaucus. Glaucous Gull. 



The big Glaucous Gulls were first observed June 29th, latitude 

 61° 32' N. They were not common, however, until we reached 

 Port Clarence, Alaska. Unlike most Gulls, this species is extremely 

 suspicious and rarely comes within gun shot of the vessel. We 

 found this Gull abundant from Port Clarence all along the Arctic 

 coast to Mackenzie Bay. A southern migration of these birds was 

 observed at Point Barrow, Alaska, September 15th ; it was a cold 



