68 Clark, Pterylosis of Swifis and Hummingbirds. Ljan'. 



bird. There is no evidence that griseus interbreeds with mariance, 

 and I think it should be give full specific rank. The breeding 

 range of griseus extends along the South Carolina coast as far 

 north as the mouth of the Santee River. A glance at the map 

 of South Carolina, will show that there are no salt marshes of any 

 extent from Georgetown to Southport, N. C, in which this wren 

 could breed. 



THE FEATHER TRACTS OF SWIFTS AND 

 HUMMINGBIRDS. 



BY HUBERT LYMAN CLARK. 



Plates II and III. 



Some years ago I undertook to obtain material for a study of 

 the arrangement of the feather tracts in the Swifts and Humming- 

 birds. Through the kindness of the authorities of the United 

 States National Museum, the alcoholic material in that collection 

 was placed at my disposal, and was carefully examined. Later 

 on, some beautiful hummingbird material from Arizona came 

 into my possession through the efforts of Mr. R. D. Lusk, and in 

 1897, Mr. C. B. Taylor of Kingston, Jamaica, presented me with 

 some very valuable specimens of both swifts and hummingbirds. 

 In April, 1901, a brief statement appeared in 'The Auk' concern- 

 ing the conclusions to which the study of this material had led me, 

 and a more extended reference to them appeared in 'Science' for 

 January 17, 1902. The preparation of the entire report, however, 

 was continually postponed in the hope of obtaining more speci- 

 mens, and in July, 1905, through the kindness of Dr. Witmer Stone, 

 some alcoholic hummingbirds from Brazil were loaned me by the 

 Academy of Natural Sciences of Philadelphia. As there is little 



