POLIOPTILA. 53 



& Salv. P. Z. S. 1864, p. 344'; Baird, Rev. Am. B. i. p. 71 ^ Salv. Ibis, 1866, p. 190'°,- 

 P. Z. S. 1870, p. 183 ". 



P. nigridpiti afflnis, sed loris et superciliis albis, striga postoculari tantum nigra, eapiti nigro conjuncta. Long. 



tota 4-0, alse 1-8, caudae 1-8, rostri a rictu 0-65, tarsi 0-7. 

 $ mari similia quoad lororum et superciliarum colorem, sed capite summo plumbeo nee nigro distinguenda. 

 (Descr. maris et fern, ex Lion Hill, in statu Panamensi. Mus. nostr.) 



Eak Guatemala, Chisec (0. S. ^ F. D. G. lo) ; Sak Salvadok, La Union {0. S.) ; Nica- 

 KAGUA, Greytown {Holland^) ; Costa Eica, Punta Arenas {0. S.), Turrialba (^rce), 

 Angostura, Atirro, and Guiatil (Carmiol); Panama, Bugaba (Arce ^^), Lion Hill 

 (M'Lecmnan 4 s 8 9j^ Chepo (Arce). — Colombia ^ ; Ecuadoe ^. 



This species, originally described from specimens in the Berlin Museum obtained at 

 Carthagena in Colombia ^, was subsequently found by Fraser at Babahoyo in Ecuador ^ ; 

 and we have since had specimens sent us from the island of Puna in the Gulf of Gua- 

 yaquil. It was afterwards described by Mr. Lawrence, from examples obtained on the 

 Isthmus of Panama ^, as P. superciliaris ; but we think there is little room for doubt 

 that Panama, Colombian, and Ecuadorian birds belong to the same species, which should 

 bear the name P. bilineata. The species in its range passes beyond the State of 

 Panama through Costa Eica into Nicaragua, and as far as the Gulf of Fonseca, and then 

 reappears in the northern parts of Vera Paz, its range being interrupted by the so- 

 called P. alhiloris — a state of affairs we have attempted to explain under the heading 

 of that form. 



One of the birds shot at La Union is exactly in the plumage of the typical female 

 P. bilineata. It was found in company with males that approach much more closely 

 to P. nigricejps than to any other form, the only difference being the presence of a few 

 white feathers in the otherwise black lores of these male birds. 



The specimen shot by Salvin near Punta Arena, in Costa Eica, was found in the 

 scrubby forests in the outskirts of the town. It exhibited the restless habits so well 

 known in its congener P. ccerulea. 



4. Polioptila albiloris. (Tab. V. figg. 1, 2.) 



Polioptila albiloris, Scl. & Salv. P. Z. S. 1860, p. 398'; Ibis, 1860, p. 397"; Owen, Ibis, 1861, 

 p. 61, t. 3. f. 3'; Baird, Rev. Am. B. p. 73*; Lawr. BuU. U.S. Nat. Mus. No. 4. p. 13'. 



P. nigrieipiti affinis, sed loris (neo superciliis) albis distinguenda. Long, tota 4'3, alae 1-9, caudse 2-0, rostri a 



rictu 0-6, tarsi 0"7. 

 $ mari sinulis, sed capite plumbeo distinguenda. (Descr. maris et fern, ex Cbuacus, Guatemala. Mus. nostr.) 



Hah. Mexico, Santa Efigenia and Tehuantepec city {Sumichrast ^) ; Guatemala, Chuacus 

 (0. S. SfF.D.G.^^ and E. Owen ^) ; Nicaragua, Granada and Eealejo (J. M. Pow *). 



The original specimen described as Polioptila albiloris was shot near the village of 

 Chuacus in Vera Paz, in a gorge opening out into the great valley of the Motagua. 



