186 TYUANNID^E. 



p. 112 ; Scl. et Salv. P. Z. S. 1867, pp. 751, 978, 1873, p. 280, et 1879, 

 p. 615; iid. Nomencl. p. 50; Bert. J.f. O. 1873, p. 261; Tacz. 

 P. Z. S. 1874, p. 537, et 1882, p. 20 ; id. Orn. Per. ii. p. 288 ; Burn- 

 ford, Ibis, 1877, p. 178, et 1878, p. 60 (rep. Arg.) ; White, P. Z. 8. 

 1882, p. 607 (rep. Arg.) ; Barroios, Bull. Nutt. Orn. CI. viii.p. 201 

 (Entrerios) ; Berl. Zeitschr. yes. Orn. 1885, p. 135 (Rio Grande 

 do Sul) ; Scl. et Suds. Arg. Orn. i. p. 150. 



Above grey, thickly covered by numerous black shaft-spots ; 

 concealed vertical crest yellow ; lores and sides of the head black, 

 superciliaries white ; wings blackish, primaries slightly edged with 

 rufous, coverts and secondaries margined externally with greyish 

 white ; tail blackish, with narrow external margins of ferruginous : 

 beneath greyish white, with numerous black striations ; belly and 

 under wing-coverts tinged with yellowish and but slightly striated ; 

 bill dark brown, pale at the base ; feet blackish : whole length 7*5 

 inches, wing 4*4, tail 3*4. 



Hub. S.E. Brazil, Paraguay, Buenos Ayres, and occasionally N. 

 Brazil and British Guiana. 



Typical specimens of this form may easily be separated from 

 M. audax by their darker colour, more densely striated plumage, 

 both above and below, and by the nearly entirely black tail, with 

 only the narrow outer margins ferruginous ; but intermediate forms 

 occur which it is almost impossible to arrange satisfactorily under 

 either head : for example, one skin from Guiana and others from 

 Upper Amazonia seem to belong to this form ; others from the same 

 localities are referable to M. audax. It would perhaps be better to 

 consider all the four representatives of this group as only subspecies 

 of M. audax. 



a. Ad. sk. Eastern Peru. Sclater Coll. 



b. Ad. sk. Sarayacu, Ecuador (Buckley). Salvin-Godman Coll. 



c. Ad. sk. Bartica Grove, British Guiana Salvin-Godman Coll. 



(Whitely). 



d. Ad. sk. Para, Lower Amazons ( Wallace). Salvin-Godman Coll. 

 e-g. Ad. sk. Bahia, Brazil ( Wucherer). Salvin-Godman Coll. 

 h. Ad. sk. Novo Fribourgo, Rio de Janeiro Salvin-Godman Coll. 



( Youds). 

 i. Ad. sk. Rio de Janeiro, Brazil, R. H. Wood, Esq. 



j. $ ad. sk. Curytiba, Brazil (Natterer). Salvin-Godman Coll. 



k. J ad. sk. Sao Paolo, Brazil (Joyner). Salvin-Godman Coll. 



/. cJ ad. sk. Pelotas, Rio Grande do Sul, Salvin-Godman Coll. 



Brazil (Joyner). 



m. Ad. sk. Brazil. Sclater Coll. 



n. Ad. sk. Punta Lara, Buenos Ayres. H. Durnford [C.]. 



5. Myiodynastes bairdi. 



Saurophagus bairdi, Gambel, Joum. Ac. Phil. n. s. i. p. 40 (1847). 

 Tyrannus atrifrons, Scl. P. Z. S. 1857, p. 274. 



Myiodvnastes atrifrons, Scl. P. Z. S. 1859, p. 43 ; id. Cat. A. B. 

 p. 223; Scl. et Salv. Nomencl. p. 50; Salv. Ibis, 1874, p. 324; 



