( 149 



We have altogether received, and have before us uow, 17(i skins of Certhidea 

 olivacea — viz., 10 from Jervis, 12 from Narborongh, 35 from Iiidefatigabh", 45 from 

 various places on Albemarle, 28 from Duucan, and 46 from James Island. We are 

 unable to detect an}' differences between the specimens from the various islands, the 

 dilTcrences of colour assigned to Ridgway's C. saldiii and alhenarlei being due to 

 difi'erent age of the sjiecimeus, the larger bill of C. mhiid being not in the least 

 borne out by our material. 



2. Certhidea olivacea luteola Ridgw. 



Cei-thkha luteola, Ridgway ia Pioc. [I.S. Xat. Mas. XVII. p. 360, XIX. p. 501. 



We have a large series from Chatham Island, including the type, and find that 

 the birds from there are closely allied to C. olivacea oUeacea, but differ in being 

 generally more olivaceous on the back, and distinctly darker and somewhat more 

 olive beneath. It seems also that the bill has a tendency to be darker, for many of 

 our sj)ecimens have perfectly black bills, while of the enormous series of C. olicacea 

 olivacea not one has a really black bill. None of our C. olicaoea luteola — all collected 

 either in June (Baur) or October — has a rufous throat, but some freshly coming 

 feathers in one of our iiialei show beyond doubt that a red throat is sometimes 

 attained ! 



This form is only known from Chatham Island. ^ 



3. Certhidea olivacea ridgwayi subsp. nov. 



The Certhidea of (Jharles Island differs much from C. olicacea olicacea and 

 G. olicacea luteola in the much lighter under-surface, which wants the olive tinge. Its 

 upperside is perhaps more brownish-greyish, but this is difficult to say for certain, 

 as all our .specimens are in abraded plumage. The throat is of the same rufous- 

 cinnamon, but appears to be more rusty, as it is on a lighter, less olive ground, and 

 in lighter surroundings. The rectrices, which have only very narrow light brownish 

 tii)s in C, olicacea olicacea and C. olicacea luteola, have whitish tips of 1 to IA mm. 

 in width. The bill of most of our si^ecimens is deep black, and is perhaps generally 

 a little stouter. We have only ten skins from Charles Island. One of these 

 is in its first plumage, which differs much from the dress of the adult bird. It 

 is above dark blackish brown, on the pileum almost uniform black, on the 

 back, rump, and ujiper tail-coverts with broad light brown edges to the feathers, 

 which are again very narrowly fringed with black on the utmost tips, all the featliers 

 ashy grey at their bases. Wings and wing-coverts similarly edged, more rusty on 

 the latter. Feathers of underside ashy grey at base, then dark slate-colour and 

 rusty buff on their tips ; throat patched with blackish slate-colour, caused by the 

 greater extent of the slaty colour in the middle of the feathers. 



In the colour of the underside C. o. riil(j)cai/i resembles C. cinerascens, but is 

 not so white, and the adult malea have a red throat, which is ajiparently never 

 assumed by C. cinerascens. 



Named in honour of Mr. Robert Ridgway, to whom we owe the best work on 

 the birds of the Galapagos Islands. 



4. Certhidea olivacea becki Rothsch. 



Certhidea beckl, Rothschild iu Bull. B. O. Club. VII. p. 63 (May 1898). 



The form of Certhidea found on Wenman Island by the Harris exj)edition, iu 

 August 1897, differs from C. olicacea olicacea iu being darker above, darker and 



II 



