Appendix. 



146. Violet-green Swallow; Tachycineta thalas- 

 sina (Swains,). 



Length five inches. A peculiarly beautiful species; 

 feathers with a silky texture. Above a soft rich 

 green, changing to purplish brown on the crown 

 and to violet purplish on the upper tail-coverts. 

 Colors not lustrous as in preceding species. 

 Wings and tail blackish purple. Lower parts 

 pure white. A common summer resident in the 

 mountains where it nests in holes in trees. 



147. Rough-winged Swallow ; Stelgidopteryx 

 serripen?iis (Aud.). 



This and the next species can scarcely be distin- 

 guished in life. The distinguishing mark of 

 this bird is the outer edge of the first flight- 

 feather, which has a series of stiff hooks upon it. 

 Length five inches and a half. Above plain 

 brownish gray; below pale grayish, whitish on 

 belly. Irregularly distributed in suitable locali- 

 ties, chiefly in interior valleys and to the north- 

 ward. Nest in holes in sand banks. 



148. Bank Swallow; Clivicola riparia {Iatvu.^. 



Like preceding but without rough edge of wing, 

 and with a curious little tuft of feathers at base 

 of toes. A distinct dark band on breast. Nest 

 in similar situations and distribution about the 

 same as preceding. 



THE WAXWING FAMILY. 



Birds with a crest extending into a point; bill 

 rather short and compressed; adults without any 

 suggestion of streaking. Two very different 



