476 ME. O. SALVIN ON THE AVIFAUNA 



Genus Progne. 

 A purely American genus of Hirundinidae, 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. chalyhea, 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. jiwrpxtrea 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, Rev. Am. B. p. 278. 



Progne modesta, Voy. Beagle, iii. p. 39, t, 5 ; Prev. at Des Murs, Voy. Venus, v. p. 182. 



Hirundo modesta, Neboux, Rev. Zool. 1840, p. 291 ; Sundev. P. Z. S. 1871, p. 125. 



Nitide purpurascens unicolor, alls et cauda obscurioribus : long, tota G'6, alse -5, 

 caudse rectr. ext. 2-5, rectr. med. 1-9, tarsi 0-5, rostri a rictu 0-75. 



Hab. James Island {Darwin, Sundevall) ; Charles Island (Weboux). 



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. 



Genjis Certhidea. 



This genus was placed by Mr. Gould in the family Fringillidse, 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 Conirosfrum, and in the 

 Coerebidse, 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. , 



Certhidea olivacea. 

 Certhidea olivacea, Gould, P. Z. S. 1837, p. 7; Darwin, Zool. Voy. Beagle, iii. p. 106, t. ,xliv. ; 

 Scl. & Salv. P. Z. S. 1870, p. 323. 



cJ (Indefatigable Island) supra fusco-olivaceus, alis et cauda paulo obscurioribus, 

 illarum tectricibus fusco-albido marginatis: subtus ochrascescenti-fuscus : abdomine 



