POLIOPTILA. 53 
& Salv. P. Z. 8S. 1864, p. 344°; Baird, Rev. Am. B. i. p. 71°; Salv. Ibis, 1866, p. 190"; 
P. Z.S. 1870, p. 182". 
P. nigricipiti affinis, sed loris et superciliis albis, striga postoculari tantum nigra, capiti nigro conjuncta. Long. 
tota 4:0, alee 1:8, caude 1-8, rostri a rictu 0°65, tarsi 0°7. 
Q mari similis quoad lororum et superciliarum colorem, sed capite summo plumbeo nec nigro distinguenda. 
(Descr. maris et fem. ex Lion Hill, in statu Panamensi. Mus. nostr.) 
Hab. Guatemaa, Chisec (0. 8. & F.D. G.*°); San Satvapor, La Union (0. S.); Nica- 
raaua, Greytown (Holland *); Costa Rica, Punta Arenas (0. S.), Turrialba (Arcé), 
Angostura, Atirro, and Guiatil (Carmiol); Panama, Bugaba (Arcé™), Lion Hill 
(M‘Leannan 458°), Chepo (Arcé).—CoLompra!; Ecuapor ®. 
This species, originally described from specimens in the Berlin Museum obtained at 
Carthagena in Colombia 1, 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 Rica 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. albiloris—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. nigriceps 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 Rica, was found in the 
scrubby forests in the outskirts of the town. It exhibited the restless habits so well 
known in its congener P. cwrulea. 
4, Polioptila albiloris. (Tab. V. figg. 1, 2.) 
Polioptila albiloris, Scl. & Salv. P. Z.S. 1860, p. 298; Ibis, 1860, p. 397°; Owen, Ibis, 1861, 
p- 61, t. 2. f.3°; Baird, Rev. Am. B. p. 73°; Lawr. Bull. U.S. Nat. Mus. No. 4. p. 12°. 
P. nigricipiti affinis, sed loris (nec superciliis) albis distinguenda. Long. tota 4:3, ale 1:9, caude 2-0, rostri a 
rictu 0-6, tarsi 0°7. 
? mari similis, sed capite plumbeo distinguenda. (Descr. maris et fem. ex Chuacus, Guatemala. Mus. nostr.) 
Hab. Mexico, Santa Efigenia and Tehuantepec city (Sumechrast*) ; GuaTeEMaLA, Chuacus 
(0. S. & F. D. G.1? and R. Owen *) ; Nicaragua, Granada and Realejo (J. I. Dow *). 
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. 
