BASILEUTERUS. 175 
In Mexico as yet we only know Basileuterus belli as an inhabitant of the temperate 
highlands of the southern portion of the republic. Prof. Sumichrast records it from 
the temperate regions of Vera Cruz, beyond the limits of which it passes into both the 
alpine and hot regions; and he speaks of having met with it as high as about 6500 feet. 
Its usual resorts are thickets, ravines, and dark woods’. In Guatemala we found it 
common in the lower part of the belt of forest which surrounds the Volcan de Fuego 
between 7000 and 10,000 feet, and in the wooded ravines as low as 6000 feet. It 
here consorted with Basileuterus culicivorus, both species having very similar habits. 
Nothing is known of its nidification. 
6. Basileuterus rufifrons. 
Setophaga rufifrons, Sw. An. in Menag. p. 294’. 
Basileuterus rufifrons, Bp. Consp. i. p. 814°; Sel. P. Z. S. 1856, p. 291°; 1858, p. 299*; Baird, 
Rev. Am. B. i. p. 248°; Sumichrast, Mem. Bost. Soc. N. H.i. p. 546°; Lawr. Mem. Bost. 
Soc. N. H. ii. p. 2707; Bull. U.S. Nat. Mus. no. 4, p. 16°. 
Sylvia aurigula, Licht. Mus. Ber.’; cf. Bp. Consp. i. p. 314". 
Basileuterus delattrii, Scl. P. Z. S. 1860, p. 250* (nec Bp.). 
Supra sordide olivaceus, capite summo et regione parotica castaneis, loris nigris, superciliis et stria infra oculos 
indisdincta albis, gula tota et pectore flavis, abdomine albido, hypochondriis fuscescentibus ; rostro nigro, 
pedibus corylinis. Long. tota 4°7, ale 2-1, caude 2-3, rostri a rictu 0°5, tarsi 0°8. (Descr. maris ex 
Cinco Sefiores, Mexico. Mus. nostr.) 
Hab. Mexico 13, Sierra Madre (Grayson®7), Apam (le Strange), Real Ariba (Deppe®), 
Jalapa (de Oca®, Hoge), Mirador (Sartorius ®), Orizaba (Sallé 4) 1, temperate region 
of Vera Cruz (Swinichrast*), La Parada (Bouwcard*), Cinco Sefiores (Boucard), 
Guichicovi (Sumichrast §). 
This is another of the many discoveries of Herr Deppe in Mexico, whose specimens 
were allowed to remain buried in the Berlin Museum until after the species was 
described by Swainson in 1838. Reference was subsequently made to Deppe’s speci- 
mens by Bonaparte in his ‘ Conspectus’?. 
B. rufifrons enjoys a wide range throughout the temperate regions of Southern 
Mexico, from the Sierra Madre, near Mazatlan, to the southern confine of the republic. 
Prof. Sumichrast tells us it frequents, with B. culicivorus and B. belli, thickets, ravines, 
and dark woods, and that, though chiefly found in the temperate region, it also extends 
its range to the hot region and into the more alpine districts as high as 6500 feet. 
Some doubt seems to exist as to certain specimens, both from Mexico and Guatemala, 
whether they belong to B. rufifrons or to B. delattrit. Adult fresh-plumaged birds of 
these two species are easily distinguishable; but younger birds of the two are not so 
readily recognized, as in B. rufifrons a yellow tinge pervades the white of the under- 
surface, and in B. delattrii the yellow of this part is of not nearly so decided a tint as in 
old birds. It is probably birds of this stage of plumage that have been misnamed. On 
