195 



Distinctions. The Yellow Warbler is apt to be confused with few other species. 

 Its tail, with yellow on the inner vanes of the feathers, will distinguish it from all other 

 evenly yeUow or green species. 



Field Marks. The even and uniform bright yellow of spring birds is unmistakable. 

 Some dull females are more green than yellow but the green-edged ivings and yellow 

 tail, lack of coloiu- contrasts, size, and actions of the bird are easily recognized. 



Nesting. In an upright crotch in bushes and small trees in nest of fine fibres and a 

 large amoimt of plant down, lined with plant down and sometimes long hairs. 



The Yellow Warbler is one of the few species that sometimes refuses to incubate 

 Cowbird's eggs. Instead of tlu-owing out the intruding egg, however, it builds a new 

 nest over the old one, burying it and its entire contents, including often some of its own 

 eggs, in the foundation of the new structure, in which another set of eggs is deposited. 



Distribution. Nearly all of North America. The Eastern Yellow Warbler inhabits 

 all of Canada except the Pacific slope. 



SUBSPECIES. The Yellow Warbler is divided into four subspecies; the Eastern 

 Yellow Warbler D. aestiva which occupies most of Canada, is the type of the species. 



This is the commonest breeding warbler in southern Canada. It shares 

 with the Goldfinch the popular name of Wild Canary, but the lack of black 

 will determine it at a glance. It is found in shrubby localities in open 

 country or along stream or marsh edges. It is a common visitor to the 

 garden and its cheery little song is very pleasing. In the autumn the 

 Yellow Warbler is one of the first species to leave. Shortly after July 

 it disappears and by mid-August only a few stragglers are left. It goes 

 before many observers begin to think of autumn migrations and thus 

 details of its autumn movements are difficult to get. 



654. Black-throated Blue Warbler, fr. — fauvette bleue a gorge noir. Dcn- 

 droica ccerulescens. L, 5-28. Plate XL B. 



Distinctions. The male, so descriptively named and strongly marked, is very dis- 

 tinctive. The female, however, especially in autumn, is more difficult to distinguish, 

 it may resemble either the juvenile of the Tennessee, the autumn Black-poll, or the 

 Bay-breast. The streaked back and wing-bars, however, of the latter two are absent. 

 They are darker and more greyish-green than the Tennessee above and more buffy below. 

 An indistinct and partly concealed white or light spot at the base of the primaries is 

 always diagnostic of females of this species. 



Field Marks. The male is distinctive. The female in any plumage can usually 

 be recognized from all other evenly coloured dull green warblers by the sometimes very 

 faint fight spot at the base of the primaries, which shows far more conspicuously in fife 

 than would be expected. 



Distribution. Eastern North America, breeding in the north, south to the borders 

 of civiUzation. 



SUBSPECIES. The black-throated Blue Warbler is divided into two subspecies 

 of which we have only one in Canada, the type form D. c. ccerulescens, the Northern 

 Black-throated, though occasionally specimens closely approach the southern variety, 

 Cairn's Warbler D. c. cairnsi, in having a suggestion of black spots on the back. 



655. Myrtle Warbler, yellow-rumped warbler, fr. — la fauvette a croupion 

 JAUNE. Deiidroica coronata. L, 5-65. Plate XLIA. 



Distinctions. A very easily recognized species. All plumages have at least sugges- 

 tions of the yellow crown, rump, and side marks. The juveniles are largely rusty brown 

 above and have more or less of a wash of same colour across breast with the streaks only 

 sUghtly indicated. 



Field Marks. The yellow rump is always distinct and bright and makes the most 

 conspicuous field mark. Its presence and the side and crown marks of the same colour, 

 sometimes indistinct in autumn but always present, make reliable identification guides 

 in life. 



Nesting. In coniferous trees 5 to 10 feet above the ground in nest of vegetable fibre 

 lined with grasses. 



Distribution. Nearly all of North America north to tree limits. Breeding just beyond 

 the dense settlements. 



