92 THE BIOLOGICAL REVIEW. 



men, pure glossy white ; back, black, fading to grey-black on 

 sides, and intersected longitudinally by six white lines brightest 

 in middle of back ; wings, blackish, showing indistinct white 

 marks ; bill, black on culmen and anterior half, with a right- 

 angular-shaped white mark on the bend of culmen, embracing a 

 decided knob, the white also appearing on the tip of lower 

 mandible, which is pinkish, with a dusky mark on middle ; feet, 

 greyish blue. 



B. L. Nussey. 



NESTING OF CANADIAN WARBLERS. 



BLACK AND WHITE WARBLER (Mlliotiltd VCll'lCl). 



This species is one of our wild woodland warblers. They 

 are never seen in the open fields or gardens, or even in high, 

 hardwood-timbered tracts, except where the underwood is dense 

 and the ground moist. In general its haunts and home for the 

 season is the bordering of swampy woods, or similar places as 

 those frequented by the Water Thrush and the Canadian 

 Warbler, and here it doubtless finds the particular insect food 

 on which it subsists and feeds its young. While in quest of 

 food, especially in the early spring time, it may often be 

 observed running up the trunks of trees, and out along the 

 branches, somewhat after the manner of the Nuthatches, from 

 which circumstance it has, until recently, been known among 

 ornithologists as the Black and White Creeper. 



On the opening of our spring, usually the latter days of 

 April or beginning of May, its arrival is announced by its oft- 

 repeated song, which resembles the words, " sweeten, sweeten, 

 sweeten," repeated three or four times in rapid succession. 



It is among the first of our warblers to arrive in spring. 



It builds its nest about the last week of May or in June, 

 which is usually placed on the ground, or in a bank of earth 

 turned up by the roots of a fallen tree, but always in a cavity 



