( 151 ) 



7. Certhidea olivacea fusca Scl. & Salv. 



O-rlhidm fusca, Sclater & Salvin in Prm: Zool. Snc. Land. (1870, pp. 323, 324) ; Salvin in Trans. 

 Zuul. Sue. Loud. IX. p. 477 ; Sclater, Cut. B. Brit. Miis. XI. p. 28 (1886) ; Ridgway in Pr;c. 

 U.S. Xat. Mus. XIX. p. 502. 



Tills form is decidedly paler below than the other siib.sj)ecies of C. olicacea, and 

 less olivaceous above and beneath, and the adult male does evidently never acquire 

 the tawny, cinnamon, or ochraceous throat, chin, or superciliary line. The bill is 

 generally rather longish, measuring 8*3 to HI mm. from nostril to tip of upper jaw. 

 In about fifty skins from Abingdon and Bindloe before us, there is none with a 

 wholly black bill. 



C. 0. fiLica is common on Abingdon and Bindloe Islands, and specimens from 

 the two islands arc iudistingnishable. 



8. Certhidea cinerascens cinerascens Hidgw. 



Certhidea cineriiHceiis, Ridgway in Pror. U.S. Xat. .l/«s. XII. pp. 105, 119, 127. 

 Certhidea olivascens (lapsus calami), Ridgway in Proc. U.S. Xat. .Uus. XII. p. 124. 

 Certhidea cinerascens, Ridgway in U.S. Sat. Mus. XIX. p. 503. 



This form differs so much from all the preceding ones, by its much paler under- 

 snrface, which is brownish white, its more greyish back and generally shorter bill, 

 that it will probably be necessary to keep it (together with bifasciata) specifically 

 distinct from the oliracea-gvomp. The bill does not exceed 8*5 mm. (from nostril to 

 tip). The rectrices have very narrow white tips, which are widest on the outermost 

 rectrices, where also the inner web is bordered with white, the upper wing-coverts 

 have pale whitish-brown edges. Unfortunately our series, which is collected in 

 October, is in very abraded, worn plumage, but it seems that the throat is never 

 rufous or ochraceous at all, but the breast has a buff tinge in the middle. 



This form is known from Hood Island, and we have also one from Gardner 

 near Hood Island. 



'J. Certhidea cinerascens bifasciata Kidgw. 



Certhidea bifasciata, Ridg^vay in Proc. U.S. Xat. Mus. XVII. p. 359 ; XIX. p. 3o4. 



Nearest to C. cinera.)sceii,s ciiwrasceiis, from which it differs in being still whiter 

 beneath, being almost pnre white with a buff tinge, and with two fairly distinct 

 whitish bars across the wing, formed by the wide almost white tips to the middle 

 and greater upper wing-coverts. Only found on Barrington Island. ^ 



The iris of all Certhideae is brown. 



Genus PROGNE Boie. 



Prorjne, Boie in Isis p. 971 (1S2G). 

 Pltaeojtroijiir, Baird, Heriew Ainer. B. p. 283. 



This genus is spread over the greater parts of temperate and trojiical America 

 and 'West Indian Islands. One species peculiar to the Galapagos Islands. 



