MNIOTILTID^ THE AMERICAN WARBLERS. 163 



purer white lower parts, which, though faintly tinged with pale buffy- 

 yellow, are whiter even than in S. motacilla, but without a trace of 

 the creamy tinge always observable in the latter, especially on the 

 flanks and crissum. The upper parts are also decidedly less olive 

 than in true noveboracensis. This example measures : Wing, 3.20 ; 

 tail, 2.45 ; till, from nostril, .42 ; tarsus, .90; middle toe, .55. The bill 

 is quite appreciably stouter than in true noveboracensis. The super- 

 ciliary stripe and suborbital spot are pale fawn-buff throughout. 



A specimen from Tucson, Arizona (May 4, mus. W. Brewster), is 

 similar in color to the type of notabilis, except that the streaks below 

 are decidedly narrower, the spots on the throat much smaller, and 

 the upper parts lighter and grayer. The tarsi are more slender, 

 and the tail and bill much shorter. The measurements are as fol- 

 lows: Wing, 3.20; tail, 2.25; culmen, .52; bill, from nostril, .40; 

 tarsus, .80; middle toe, .60. 



Examples collected by me in Kichland and Wabash counties, 

 Illinois, and in Knox county, Indiana (near Wheatland), are very 

 typical of this race. 



GENUS GEOTHLYPIS CABANIS. 



We follow the ruling of the Committee of the American Orni- 

 thologists' Union on Classification and Nomenclature in uniting 

 under one heading the current genera Geothlypis and Oporornis, the 

 differential characters of which are expressed in the analytical table 

 on page 115. Under its own heading will be found a fuller diagno- 

 sis of each subgenus, and a key to the species. 



SUBGENUS Oporornis BAIRD. 



Oporornis BAIED. Birds N. Am. 1858, 246. Type, Sylvia agilis WILS. 



"GEN. CHAR Bill sylvicoline, rather compressed; distinctly notched at tip; rictal 

 bristles very much reduced. Wings elongated, pointed, much longer than the tail; the 

 first quill nearly or quite the longest. Tail very slightly rounded ; tail feathers acumi- 

 nate, pointed; the under coverts reaching to within less than half an inch of their tip. 

 Tarsi elongated, longer than the head; claws large, the hinder one as long as its digit, 

 and longer than the lateral toes. Above olive-green; beneath yellow; tail and wings 

 immaculate. Legs yellow. 



"This group of American Warblers is very distinct from any 

 other. The typical species is quite similar in color to Geothlypis 

 Philadelphia, but is at once to be distinguished by much longer 



