Plumbeous Bush-Tit 509 



Aiken found a nest in the foothills north-east of Canon 

 City, containing five eggs, May 9th, 1876 ; D. P. Ingraham 

 took three sets of eggs near Beulah, at the foot of the 

 Wet Mountains, in the summer of 1897, and W. Cross 

 a nest with six eggs at Glenwood Springs, but no further 

 details are given by Cooke. 



Nests taken by Lieut. Benson, U.S.A., in southern 

 Arizona (Bendire, " P.U.S.N. Mus.," XI., p. 557) were 

 gourd-like in shape, woven into and supported by twigs 

 of scrub oak ; they were made of sage-bush leaves, spider 

 web, moss and lichen, and thickly lined with soft small 

 feathers ; the entrance was on the side near the top. 

 The eggs were pure white in colour, and ovate in 

 shape ; they were four to six in number, and measured 

 •53 X -40. 



Family SYLVIID^. 



This family contains the true Warblers chiefly met 

 with in the Old World. They are very closely alhed 

 to the Thrushes, from which they can best be distin- 

 guished by the fact that the young are unspotted, and 

 that most of them undergo a double moult in spring 

 and autumn. 



The United States genera can be easily distinguished 

 by their small size — wing under 3 — their slender bill 

 more or less notched at the tip, their wing with ten 

 primaries, the outer of which is barely or considerably 

 less than half the next, and by their plain blueish or olive- 

 greenish plumage. 



Key of the Genera. 



A. Tarsiis booted ; crown with a yellow or reddish patch. 



Regulus, p. 510. 

 B. Tarsus scutellate ; no crown-patch ; plumage chiefly slaty. 



Polioptila, p. 513. 



