ATTICORA.—HIRUNDO. 231 
it in several parts of the Altos, at an elevation of at least 8000 feet above the sea. 
In its habits and mode of flight we noticed nothing to distinguish it from other 
Hirundinide. 
3. Atticora tibialis. 
Petrochelidon? tibialis, Cassin, Pr. Ac. Phil. vi. p. 370°. 
Microchelidon tibialis, Scl. Cat. Am. B. p. 39%. 
Neochelidon tibialis, Scl. Cat. Am. B. p. xvi*®; Sel. & Saly. P. Z.S. 1864, p. 347 *. 
Aiticora tibialis, Baird, Rev. Am. B. i. p. 807°; Scl. & Salv. P. Z. S. 1879, p. 495°. 
Fuliginosa, uropygio et corpore subtus paulo dilutioribus, tibiis plumosis albis, rostro et pedibus nigricantibus. 
Long. tota 4:0, ale 3:3, caude rectr. med. 1°3, rectr. lat. 1-75, rostri a rictu 0-4, tarsi 0-4. (Descr. 
exempl. ex Panama. Mus. nostr.) 
Hab. Panama, line of railway (MU‘Leannan 4 *).—CotomBia®; Brazin?2. 
Cassin, who first described this peculiar Swallow, gave Brazil as its supposed habitat ; 
but as it was subsequently obtained by M‘Leannan on the isthmus of Panama, the cor- 
rectness of the statement of its being found in Brazil was doubted‘. It may, however, 
be worthy of notice that there is a skin of this bird in the Swainson collection at Cam- 
bridge with the locality “Brazil” on its label. On the other hand, no mention 
whatever is made of A. tibialis in any of the chief works on Brazilian ornithology, those 
of Prince Neuwied, Burmeister, Pelzeln, &c. That the bird does occur beyond the 
limits of the State of Panama is proved by the specimen sent us from the State of 
Antioquia by Salmon, who found it at Remedios, where it was breeding, the nest being 
made of dry grasses and placed in the hole of a bank 6. 
Atticora tibialis has no near allies, but in colour is not unlike A. cinerea. The 
white tufts on the tibize are a very distinctive character. 
HIRUNDO. 
Hirundo, Linnzeus, Syst. Nat. i. p. 343 (1766) ; Baird, Rev. Am. B. i. p. 293. 
Only one species of true Hirwndo occurs in America, the nearest ally of which is 
perhaps #. gutturalis, the eastern form of the well-known H. rustica of Europe. 
The genus itself, as restricted, contains about twenty-five species, which are found 
distributed over a large portion of the world. 
Hirundo can readily be distinguished from Atticora by the nasal opening being over- 
hung by a membrane in such a manner that the nostril opens laterally, instead of 
directly upwards. 
The same character is to be found in Tachycineta; but in that genus the tail is but 
very slightly forked, whereas in Hirundo the lateral feathers are attenuated and twice 
as long as the central feathers. 
