APPENDIX G 361 



Stercorarius parasiticus (Linn.). Parasitic Jaeger. 



This is the common jaeger of the region. It was first observed 

 near the eastern end of Great Slave Lake, where it was fairly 

 common, July 25, 26, and 27. It was next seen on Casba Lake, 

 August 8, and near the southern end of Clinton-Colden Lake on 

 the following day. On this lake we found it rather common, 

 August 10 to 12, and it was also observed on Aylmer Lake, 

 August 17, 21, and 23. Last seen on Casba Lake on August 31. 



Lams argentatus Pontoppidan. Herring-Gull. 



The herring-gull is quite generally distributed over the region 

 wherever there are lakes or good sized rivers. It was noted on 

 the lower Athabaska on May 29, 30, and 31 ; near Fort Chipe- 

 wyan, June 5, and near Fort Smith on June 22, when it was 

 apparently breeding. We noted a few pairs about the meadows 

 bordering the Nyarling, a branch of Little Buffalo River, on 

 July 8 and 9. The numerous rocky islands, which are scattered 

 over the eastern half of Great Slave Lake, are favourite nesting 

 places, and we observed it in greater or less numbers nearly every 

 day, July 13 to 25, between Fort Resolution and the eastern 

 extremity of the lake. It was common also on Artillery Lake, 

 where we saw it daily, August 1 to 6; on Clinton-Colden Lake, 

 August 10 to 13, and on Aylmer Lake, August 14 to 26. While 

 on our return trip we noted it on Clinton-Colden Lake, August 

 28 and 29, and on Casba Lake, August 30 and 31, when young 

 were observed on the wing. It was still common and was ob- 

 served daily on Artillery Lake, near the tree limit, September 3 to 

 8, on which last date birds of the year were observed with their 

 parents. During our return voyage along the northern shore of 

 Great Slave Lake we saw it in small numbers, September 12 to 25. 



Larus californicus Lawrence. California Gull. 



This gull was noted at a number of points among the islands 

 scattered along the north shore of Great Slave Lake on July 19, 

 21, 24, 26, and 27. We failed to observe it while voyaging along 

 the lake on our return trip. 



