474 MR. O. SALVIN ON THE AVIFAUNA 
é ad. supra olivaceus: pileo antico castaneo: alis et cauda fusco-nigris extus olivaceo 
marginatis; tectricibus alarum conspicue luteo marginatis: rectricibus, nisi duabus 
mediis, in pogonio interno luteis, apicibus fuscis: subtus flavus, pectore et hypochondriis 
maculis elongatis castaneis notatis. 
é jun. supra olivaceus, pileo antico concolori: alis et cauda fuscis plumarum margi- 
nibus dorso concoloribus: subtus sordide luteus, maculis castaneis adulti carens. 
2 ad. supra cinereo-olivacea, tectricibus alarum sordide albo marginatis: subtus alba 
vix luteo tincta: iride brunnea. 
Long. tot. Alee. Caudee. Tarsi. Rostri a rict. 
dad. . . 50 2°65 21 0°85 0:65 
Sjun.. . 475 2°5 19 0:8 0-6 
Ova.” teow 25 15 19 0°82 0-6 
Hab. Galapagos generally (Darwin); Chatham Island, Charles Island, James Island 
(Sundevall); Indefatigable Island, Bindloe Island, Abingdon Island (Habel); Gala- 
pagos (Vébouz). 
Of this form of Dendreca wstiva Dr. Habel has collected a large series of specimens 
of different ages and of both sexes. Fifty-four are from Indefatigable, two from Bindloe, 
and seven from Abingdon. Mr. Darwin does not particularize the islands on which he 
met with it, but says that it is ‘not uncommon on the islands.” We may therefore 
assume that it is generally distributed over the group. 
Professor Baird, in his ‘Review of American Birds,’ has given a careful résumé of 
the differences which may be detected in the various local forms of D. estiva. With 
the present form he was only acquainted from the figure and description in the ‘ Voyage 
of the Beagle, and says of it that it “appears to resemble D. petechia in coloration, but 
to differ in fewer and lesser stripes beneath, in the grey of the head, and the lightness 
of the abdomen.” The original specimen thus spoken of appears not to haye been 
quite adult; for in the full-plumaged birds of J. aureola the differences alluded to 
entirely vanish, and the general plumage becomes as nearly as possible that of D. petechia. 
The only differences I can detect are:—(1) the general size of D. aureola is slightly 
larger; (2) the second, third, and fourth primaries in most specimens of D. aureola are 
nearly equal, in D. petechia the second is generally rather shorter than the two fol- 
lowing. But I do not believe that it would be always possible to separate a series of 
specimens of these two forms if mixed together. 
Under these circumstances, regarding the two forms as virtually identical, we have 
the following singular state of affairs. The bird from the Galapagos is the same as 
that from Jamaica, whereas on the intervening continent two other (so-called) species 
occur—namely, D. wstiva as a winter migrant, and D. vicilloti as a resident—but never, 
as far as we know, D. petechia. 
“ During my stay in the archipelago I was strongly disposed to believe that the spe- 
