266 Proceedings of the Biological Society of Washington. 



on the crown bordering the yellow superciliary, whereas in superciliaris 

 the crown and forehead are of exactly the same color as the back. It is, 

 however, interesting to observe that three of our sixteen Peruvian speci- 

 mens of signatus from the Subtropical Zone show this character of a dusky 

 stripe on the sides of the crown above the yellow superciliary, and this 

 feature is more pronounced and more constant in five specimens from the 

 Subtropical Zone of Bolivia. 



This character clearly suggests relationship with "Myiothlypis" euo- 

 phrys, the Bolivian representative of nigrocristatus, and this, in turn, raises 

 the question of the status of Myiothlypis as a genus. The case has an im- 

 portant bearing on the problem of the origin of zonal faunas, and I trust 

 to return to it at a later day with both increased material and added field 

 experience. 



Pheucticus uropygialis terminalis, new subspecies. 



Subspecific characters. — In the comparative absence of black markings 

 on the sides and flanks, and in the large size of the white endings of the 

 greater wing-coverts, resembling Pheucticus uropygialis meridensis Riley, 

 of Venezuela; in the extent of yellow anteriorly on the bases of the feathers 

 of the interscapulum nearer meridensis than to Pheucticus uropygialis 

 uropygialis Scl., of Colombia; differing from both meridensis and true 

 uropygialis in having large white terminal, or slightly subterminal, rounded 

 spots on the upper tail-coverts instead of small white or yellowish trans- 

 verse subterminal marks on these feathers; lower tail-coverts whiter; tibiae 

 yellower. 



Type.— No. 145,557, Am. Mus. Nat. Hist., [d 1 ], San Miguel Bridge, 

 Urubamba Canon, 5000 ft., Peru; July 19, 1916; H. Watkins. 



Specimens examined. — Pheucticus uropygialis terminalis. Peru: Type 

 locality, 1 [cf ]; Chauillay, Urubamba River, 3700 ft., 1 [<?]. 



Pheucticus uropygialis uropygialis. Ecuador: 1 d 1 ; Mocha, Chim- 

 borazo, 1 9 . Colombia: Subia, 2 d 1 ; La Mar, 1 d" ; Palo Hueco, 1 d" ; 

 Fomeque, 1 d 1 ; Chipaque, 2 d 1 (all near Bogota and hence topotypical) . 



Pheucticus uropygialis meridensis. Venezuela: Near Merida, 5 d 1 

 (topotypical). 



Remarks. — Pheucticus uropygialis does not appear to be represented 

 in most Peruvian collections. Kalinowski secured a female near Cuzco, 

 which von Berlepsch, in reporting on his collections (Ornis, 1906, p. 103), 

 states he had not seen. Jelski took it near Huanta and it is contained in 

 the Raimondi collection from Huancayo. It was probably on Raimondi's 

 specimens that Taczanowski (Orn. Per., Ill, p. 2) based his description in 

 which the words " sus-caudales noires terminees d'unegrossetache blanche" 

 indicate that he evidently had the race here described in hand. This white 

 spot on the longest tail-covert of the type is terminal and measures 8 mm. 

 along the shaft of the feather. In a second male, which is in the molt, and 

 in which this covert has not yet attained its full growth, it measures 12 mm. 

 and is margined by a black border 3 mm. in width. 



A female collected by Heller does not agree with the female of aurei- 

 ventris, as stated by Taczanowski, but differs from it in having the throat 



