TYEANNIDiE — THE TYKAi^T FLYCATCHERS— COJITOPUS. 323 



about equal to the fourth. All the primaries slender and rather acute, but not attenuated. 

 Head moilerately crested. Color, olive above, pale yellowish beneath, with a darker patch 

 on the sides of the breast. Under tail coverts streaked. 



There is one Eastern species not found on this coast, though it has been 

 attributed to it (C. virens). It differs from C. Richardsonii in smaller size, 

 outer primary edged with whitish, the breast paler than the back, and with 

 a median white Une. 



Contopus borealis, Swainson. 



THE OLIVE-SIDED FLYCATCHEK. 



Tyrminns horealis, Sw. and Rich., Fauna Bor. Amcr. W. 1831, 141 ; plate. 



Musckapa inormila, NuTTALL, Man. I. 1832, 282. 



Muscicapa Cooperi, NuTTALL, Man. I. 1832, 282. — AuDUBON, Orn. Biog. H. 1834, 422; V. 



1839, 422; pi. 174. Ib. Birds Amer. I. 1840, 212; pi. 58. — Ti/rannus Cooperi, BoK.\- 



PARTE, List, 1838. — NuTTALL, Man. I. 2d ed. 1840, 298. — Contopus Cooperi, Cabanis, 



Jour, fur Ornithol. III. Nov. 1855, 479. 

 Contopus borealis, B.URD, P. R. Rep. IX. Birds, 188. — Cooper and Scckley, XII. iii. 



Zool. ofW. T. 169. 

 Contopus mesoleucus, Sclater, Pr. Z. S. 1859, 43. (Mexico.) 



Sp. Cii.\i:. Wings long, much pointed ; the second cpull longest ; the first longer than 

 the third. Tail deeply forked. Tarsi short. The upper parts ashy brown, showiniT 

 darker brown centres of the feathers ; this is eminently the case on the top of the head ; 

 the sides of the head and neck, of the breast and body resembling the back, but with the 

 edges of the feathers tinged with gray, leaving a darker central streak. The chin, throat, 

 narrow hne down the middle of the breast and body, abdomen, and lower tail coverts 



white, or sometimes with a faint tinge of yellow. The lower tail coverts somewhat 

 streaked with brown in the centre. On each side of the rump, generally concealed by 

 the wings, is an elongated bunch of white silky feathers. The wings and tail very dark 

 brown, the former with the edges of the secondaries and tertials edged with dull white. 

 The lower wing coverts and axillaries grayish-brown. The tips of the primaries and tail 

 feathers rather paler. Feet and upper mandible black, lower mandible brown. The 

 young of the year sinular, but the color duller ; the feet light brown. Length, 7.25 ; e.x- 



