TROGLODYTIDZ. 63 
resemblance, but showing some diversity in colour. Two genera have usually been 
admitted under the names given above; but the characters dividing them are very 
slight, and some species have been placed first in one genus and then in the other. 
The formation of the nostril is the chief character by which they have been sought to 
be distinguished ; but this proves to be not very trustworthy, such species as C. yocosus 
forming a connecting link between the two. 
With the exception of one species found all along the southern frontier of the 
United States, and another in the promontory of Lower California, all the species 
belong to the Neotropical Region, Mexico and Central America being the metropolis 
of the genus, where no less than half its members are found. In South America 
Campylorhynchus ranges over nearly the whole country as far south as Bolivia; but 
none of the species are specifically the same as those of Central America. 
The various species are usually somewhat gregarious in their habits, as many as ten 
or twelve individuals being often found together, except during the breeding-season. 
Though C. brunneicapillus is credited with a powerful song, our experience of these 
birds is that their notes are harsh, and that their song, if such it may be called, is 
far inferior to that of many Troglodytide. 
A. HELEODYTES. 
Nares aperte subrotundate ; pileus fere unicolor. 
a. Nares aperte, fere rotunde ; nucha haud striata. 
1. Campylorhynchus albibrunneus. 
Heleodytes albobrunneus, Lawr. Ibis, 1862, p. 10*; Ann. Lyc. N. Y. vi. p. 470°; Scl. & Salv. 
P.Z. 8. 1864, p. 344°. 
Campylorhynchus albibrunneus, Baird, Rev. Am. B. i. p. 98 *. 
Brunneus, capite toto, cervice et corpore subtus cum tectricibus subalaribus pure albis, erisso brunneo subob- 
solete transfasciato ; rostro et pedibus obscure brunneis. Long. tota 7°3, ale 3:3, caude 3-1, rostri a 
rictu 1°1, tarsi 1:05. (Descr. maris ex San Pablo, Panama. Mus. nostr.) 
Hab. Panama, Veraguas (Arcé), Frijole* and Lion-Hill Stations (I/‘Leannan'?), San- 
Pablo Station (0. 8.3). 
This peculiar species has a very restricted range, all the specimens (with one exception) 
that we have seen having been obtained at some one of the stations on the Panama 
railway. It goes a little further into the Isthmus, having been sent from the neigh- 
bourhood of Veraguas by Arcé. 
Mr. Lawrence first described it in ‘The Ibis’ from specimens sent him by M‘Leannan}, 
and afterwards included it in one of his lists of Panama birds?. When crossing the 
Isthmus in 1863, Salvin shot a bird of this species in some low trees near the railway 
at San-Pablo Station. It was seen climbing about the outer branches of a tree 
with the restless habits of a true Campylopéerns °. 
