86 TTEANNID^. 



Bugaba^, Calovevora^ (ArcS), Lion Hill (M'Leannan^), Chepo (Arce). — South 

 America, Ecuador ^^ and Bolivia ^. 



A series of specimens of this Tyrant-Flycatcher from the northern part of its range 

 when compared with a similar series of C. virens shows that these species are barely 

 separable. The upper plumage, however, of C. richardsoni is slightly less olivaceous 

 than that of C. virens ; the chest is more continuously and distinctly cinereous and the 

 abdomen scarcely tinged with yellow. When, however, we come to the migratory 

 flocks which spread southward at the approach of winter and distribute themselves 

 throughout Mexico and Central America, we find the greatest difficulty in discrimi- 

 nating between these two birds. In naming our specimens we have been governed a 

 good deal by their geographical distribution, and we believe that the western 

 form in winter spreads over the greater part of Mexico, Guatemala, Costa Eica, and 

 Panama, and thence southwards as far as Bolivia. The only point where the two 

 birds come into contact as shown by our specimens is in the North Mexican State 

 of Nuevo Leon, whence Mr. Armstrong has recently sent us specimens which must 

 certainly be referred to C. virens, while others are almost as certainly referable to 

 C. richardsoni. 



In general appearance C. richardsoni is also exceedingly like C. hrachytarsus ; but the 

 latter may be distinguished by its shorter and more rounded wing, the first primary 

 hardly exceeding the fifth in length. In C. richardsoni it is obviously longer. 



We are in some doubt whether C. pleleius applies to this species or to C. brachy- 

 tarsus, and the question cannot be settled without an examination of the types, which 

 are said to have come from Mexico ^o. The measurement of the wing points rather to 

 the latter bird. 



The writings of North- American ornithologists give full details concerning this bird, 

 and from them we gather that its breeding-range comprises a vast area extending from 

 Arizona and Texas to the Great Slave Lake. The nest is described as constructed 

 chiefly of plant-fibres, sometimes, though rarely, ornamented with lichens and secured 

 in the fork of a branch of a tree. The eggs are like those of C. virens. 



8. Coutopus brachytarsns. 



Empidonax brachytarms, Scl. Ibis, 1859, p. 441 ' ; Lawr. Ann. Lye. N. Y. vii. p. 327 '. 

 Contopus brachytarsus, Salr. Ibis, 1861, p. 354 ^ j P. Z. S. 1870, p. 199 * ; Scl. & Salv. P. Z. S. 1864 



p. 360'; Ridgw. Man. N. Am. B. p. 339°, x. p. 589'; Scl. Cat. Birds Brit. Mus. xiv' 



p. 240'. 

 Contopus schotti, Lawr. Ann. Lye. N. Y. ix. p. 202 " ; Ridgw. Pr. U. S. Nat. Mus. viii. p. 571 " 

 Contopus depressirostris, Ridgw. Pr. U. S. Nat. Mus. vi. p. 403". 



G. virenti quoque similis, sed minor, alia magia rotundatia, remige primo quinto fere sequali hand longiore ut 

 videtur distinguendua. (Descr. feminae exempl. typ. ex Cordova, Mexico. Mus. Brit ) 



E(d>. Mexico, Cordova, Santecomapan {SallS i), Teapa {Mrs. E. H. Smith), Merida in 



