476 MR. O. SALVIN ON THE AVIFAUNA 
Genus PROGNE. 
A purely American genus of Hirundinide, one (or two members, recognizing 
Professor Baird’s P. cryptoleuca) of which belong to North America, the rest being 
restricted to the Neotropical Region. The species inhabiting Central America and 
the northern portions of South America is P. chalybea, in which the abdomen in both 
sexes is white, as is the case in the Antillean P. dominicensis. The present bird, in its 
whole-coloured plumage, resembles P. purpurea of North America—a species which 
ranges into Brazil, but keeps always to the east coast of the southern continent. 
PROGNE CONCOLOR. 
Hirundo concolor, Gould, P. Z.S. 1837, p. 22. 
Progne concolor, Baird, Rey. Am. B. p. 278. 
Progne modesta, Voy. Beagle, il. p. 39, t. 5; Prév. et Des Murs, Voy. Vénus, v. p. 182. 
Hirundo modesta, Néboux, Rev. Zool. 1840, p. 291; Sundey. P. Z.S. 1871, p. 125. 
Nitide purpurascens unicolor, alis et cauda obscurioribus: long. tota 6°6, ale 5, 
caude rectr. ext. 2°5, rectr. med. 1:9, tarsi 0°5, rostri a rictu 0°75. 
Hab. James Island (Darwin, Sundevail); Charles Island (Vébouz). 
Dr. Habel did not secure specimens of this Swallow, but appears to have seen it on 
Indefatigable Island. It has hitherto only been obtained on James Island and Charles 
Island. 
Genyis CERTHIDEA. 
This genus was placed by Mr. Gould in the family Fringillide, and in his opinion 
represented the extreme form of the group characterized by Geospiza. After a close 
examination Mr. Sclater and I convinced ourselves (Nomencl. Av. Neotr. p. 16) that 
this somewhat singular form was best placed near the genus Conirostrum, and in the 
Coerebide, the attenuated and sharply pointed bill suggesting forcibly an affinity with 
that genus and family. From Conirostrum Certhidea differs in having much shorter 
wings and tail; but in the form of the nostril, the scutellation of the tarsi, and in the 
proportionate length of the toes it agrees closely with that genus. 
The genus Conirostrum contains six species, all of which are restricted in their range 
to the Andes, and are found at a considerable elevation from Columbia to Bolivia, 
never descending into the hot lowlands. 5 
CERTHIDEA OLIVACEA. 
Certhidea olivacea, Gould, P.Z.8. 1837, p. 7; Darwin, Zool. Voy. Beagle, iii. p. 106, t. xliv.; 
Scl. & Saly. P. Z.S. 1870, p. 323. 
3 (Indefatigable Island) supra fusco-olivaceus, alis et cauda paulo obscurioribus, 
illarum tectricibus fusco-albido marginatis: subtus ochrascescenti-fuscus: abdomine 
