210 Annals of the Carnegie Museum. 



Measurements of type. — Wing, 105 mm.; tail, 87; exposed culmen, 

 20.5; tarsus, 18. 



Remarks. — Although only a single specimen from the Paramo de 

 Rosas is available, this differs in so many important respects from a 

 large series from other localities with which I have compared it that 

 I have little hesitation in ascribing it to a heretofore unrecognized 

 alticoline form of Myiodynastes chrysocephalus. The series of the 

 latter examined includes a number of young birds, which are quite 

 different from the skin from the Paramo de Rosas, which is unquestion- 

 ably adult. In this series the back is decidedly olive-green, contrasting 

 strongly with the grayish crown, while the abdomen and under 

 tail-coverts are canary-yellow. 



Myiodynastes chrysocephalus was originally described from Peru, 

 from which country I have been unable to examine any material in 

 this connection, but there are reasons for believing that when such 

 comes to hand it will be found that the ordinary bird of Venezuela and 

 Colombia is subspecifically separable. At any rate, it is certainly 

 different from the Ecuador bird, which Messrs. Taczanowski and 

 Berlepsch {Proceedings Zoological Society of London, 1885, 91) have 

 described as a distinct subspecies, M. c. minor. 



Machetornis rixosa fiavigularis subsp. nov. 



Type, No. 36,547, Collection Carnegie Museum, adult male; Tocuyo, 

 Estado Lara, Venezuela, January 20, 191 1 ; M. A. Carriker, Jr. 



Subspecific characters. — Similar to Machetornis rixosa rixosa (Vie- 

 illot) from Brazil, Bolivia, etc., but under parts brighter yellow, the 

 throat and breast but little paler than the abdomen; crown less 

 purely gray, contrasting less strongly with the back. 



Measurements of type. — Wing, 97 mm.; tail, 78; exposed culmen, 20; 

 tarsus, 30. 



Remarks. — This is a strikingly distinct form, perhaps entitled to 

 specific rank. The characters upon which it rests are very constant 

 in a series of twelve specimens from Venezuela (Orinoco valley and 

 the north coast) as compared with a similar series from Bolivia, Brazil, 

 Paraguay, and Argentina, in which the chin, cheeks, and throat are 

 white or creamy white, brightening into yellow only on the breast 

 and abdomen, instead of being decidedly yellow throughout. Four 

 examples from the Santa Marta region of A Colombia, although ob- 

 viously referable to fiavigularis, are a little paler than the Venezuelan 



