172 MNIOTILTID A. 
regions of Southern Mexico, where it has been noticed by many collectors from Deppe 
to the present time. In Guatemala it is also an inhabitant of the temperate forests of 
both coasts, being abundant in the Volcan de Fuego as high as 6500 feet, and in Vera 
Paz between 4500 and 1500 feet. We always found it in humid forest searching for 
its food amongst the leaves, twigs, and bark of the stems of the trees, its habits being 
much like those of the Mniotiltide in general. It does not occur beyond the spurs of 
the higher mountains of the State of Panama, being absent from the line of railway, 
and its place taken by allied species in the southern continent. | 
As indicated above, southern specimens are more olivaceous on the back, and have 
the middle of the vertex deeper orange. These differences have already been noticed 
by Prof. Baird, who suggests that they may be merely seasonal, adding at the same 
time that they indicate a closer relationship between B. culicivorus and B. bivittatus than 
usually admitted, and that these birds may ultimately be referred to that species. The 
absence of the distinct dark mark behind the eye separates the former from B. bivittatus ; 
and it only remains to consider the relationship of the two Central-American races of 
B. culicivorus, the Mexican and Guatemalan and the Costa-Rican and Veraguan. The 
distinctions alluded to are of no great amount, and, moreover, not quite constant, 
inasmuch as the colour of the crown in Guatemalan examples varies from yellow to 
orange, apparently without reference to sex, and it is only the average colour of southern 
specimens that is deeper orange. The colour of the upper surface of Costa-Rica examples 
is hardly sufficiently different to justify their bearing a distinct name. 
In his note on Giraud’s ‘ Birds of Texas,’ Mr. Sclater, while recognizing the identity 
of Muscicapa brasieri of Giraud, and Sylvia culicivora, Licht., says that the bird should 
be called Basileuterus brasieri (Giraud); and it thus passed for several years. In giving 
this decision, however, he overlooked Lichtenstein’s short but recognizable description 
of his S. culicivora }, published in 1830, the latter name having some ten years’ priority. 
b. Pileus obscurus inornatus, supercilium fulvum. 
3. Basileuterus leucopygius. 
Basileuterus leucopygius, Scl. & Salv. Nomencl. Av. Neotr. p. 1561. 
Basileuterus semicervinus, Lawr. Ann. Lyc. N.Y, vii. p. 3227 (nec Sclater). 
Balileuterus uropygialis, Scl. & Salv. P. Z. 8S. 1864, p. 847°; Baird, Rev. Am. B. i. p. 246*; Lawr. 
Ann. Lye. N.Y. viii. p. 180°; ix. p. 95°; Salv. P.Z.S. 1867, p. 1367; 1870, p. 183°; 
Ibis, 1872, p. 813° (nec Sclater). 
Saturate fuscescenti-olivaceus, pileo, alis et caudex apice nigricantibus; alarum marginibus dorso concoloribus ; 
subtus medialiter albidus vix cervino lavatus, pectore et hypochondriis fusco perfusis ; uropygio et caude 
dimidio antico cervino-albidis; rostro corneo, pedibus corylinis. Long. tota 5:2, ale 2°25, caudex 2°3, 
rostri a rictu 0°6, tarsi 0-9. (Descr. maris ex Santa Fé, Panama. Mus. nostr.) 
Hab, Nicaragua, Greytown (Holland ® 8); Costa Rica (Carmiol}), Tucurriqui (Arcé 7), 
Angostura and Juiz (Carmiol*), Panama, Bugaba, Santa Fé 7 (Arcé), line of railway 
(Galbraith ?, M‘Leannan ?), 
