208 Annals of the Carnegie Museum. 



brown, margined externally with dull brownish olive; below pale 

 yellow (between primrose- and straw-yellow), brightest on the middle 

 of the abdomen, the throat, breast, and sides being shaded with buffy; 

 tibiae and under tail-coverts brownish buffy; "iris brown; feet leaden 

 horn; bill black, flesh-color below." 



Measurements of type. — Wing, 62 mm.; tail, 60; exposed culmen, 

 10.5; tarsus, 18. 



Remarks. — -This form is based upon two adult and three immature 

 birds from San Felix, Altagracia, and Upata, localities in the region 

 lying immediately south of the Orinoco east of Ciudad Bolivar. These 

 are evidently the same as the two skins from Caicara (farther up the 

 Orinoco) doubtfully referred to Myiobius barbatus atricaudus Lawrence 

 by Messrs. Berlepsch and Hartert (Novitates Zoologicce, IX, 1902, 

 49). Upon comparison with an ample series of the latter from Costa 

 Rica, however, they prove to be very distinct, being decidedly paler 

 olivaceous above, and more uniform below, with less of the buffy 

 suffusion on the breast and sides, and the tibiae and under tail-coverts 

 much paler, more buffy. From true M. barbatus, of which I have 

 three examples before me, they are still more different, and may be 

 distinguished at a glance by their deep black tails. Unfortunately I 

 have been unable to compare them with M. ridgwayi Berlepsch, but 

 the description of the latter differs in certain essential respects, and 

 it is moreover fair to presume that Messrs. Berlepsch and Hartert, in 

 the paper before referred to, would not have overlooked the possibility 

 of their specimens being referable to this form. 



In my judgment Myiobius barbatus is specifically distinct from 

 M. atricaudus, from which the form here described may prove to be 

 merely subspecifically separable. Furthermore, Mr. Hellmayr has, 

 I think, gone too far in reducing M. mastacalis (Wied) (= M. xan- 

 thopygus (Spix)) to a subspecies of M. barbatus (cf. Abhandlungen K. 

 Bayer. Akademie Wissenschaften, Miinchen, Kl. ii, XXII, 1906, 642). 

 However, as I have not yet had the opportunity of examining all of 

 the other described forms, I refrain for the present from formally 

 indicating my views on their exact relationships. 



Myiochanes ardosiacus polioptilus subsp. nov. 

 Type, Xo. 36,457, Collection Carnegie Museum, adult male; 

 Lagunita de Aroa, Estado Lara, Venezuela, December 29, 1910; M. A. 

 Carriker, Jr. 



