V i ° 1, x l Mackay on the Breeding Habits of Larus atricilla. 3 3 ^ 



Table showing Parallel Geographic Variations in certain 

 Bird Races of Northern North America. 



Hudso- 

 Canadian 



Size smallest; 

 color light. 



Parus hud- 



sonicus 

 Picoides 



americanus 

 Acanthis li- 



naria 

 Lagopus ru- 



pestris 



Barren Ground 



Size large ; 

 color dark. 



P. h. ungava 

 Picoides, subsp? 

 A. 1. rostrata 

 L. r. reinhardti 



Otocoris alpestris 



Alaskan- 

 Arctic 



Size large; 

 color lightest 



Size larger; 

 color intermediate. 



P. h. stoneyi P. h. evura 

 (Absent) P. a. alascensis 



A. 1. holboellii 

 L. r. nelsoni et athkensis 



O. a. leucohema 



Northern Rocky 

 Mountains 



Size largest; 

 color darkest. 



P. h. columbianus 

 P. a. dorsal is 

 (Non-resident ) 

 Lagopus, subsp ? 



O. a. merrilli 



OBSERVATIONS ON THE BREEDING HABITS OF 

 LARUS ATRICILLA IN MASSACHUSETTS. 



BY GEORGE H. MACKAY. 



In the neighborhood of Muskeget and Tuckernuck Islands, 

 Massachusetts, Laughing Gulls were formerly much more 

 numerous than at present, being abundant there, I am informed, 

 in 1850. In 1880 they were scarce, yet I am told a few pairs 

 bred on Muskeget Island during that summer. During the past 

 few years they have again appeared in the vicinity of the above- 

 named islands in increasing numbers, undoubtedly from the pro- 

 tection which has been given them. The summer of 1S90 

 showed a considerable increase in their numbers over former 

 years, but the number resident during the summers of 1S91 and 

 1893 was apparently about the same, and possibly there may not 

 have been quite so many in either of those years as in 1S90. 

 The summer of 1S93, however, shows an increase over 1S90, 

 which was the best for a number of years previous to that date. 



