1875.] ON THE AVIFAUNA OF THE GALAPAGOS ARCHIPELAGO. 269 
i) 9 
millim. millim. 
Distance entre l’extrémité des _rectrices 
médianes et celle des externes ...... . 55 15 
Longueur du bec depuis la commissure. . . . 29... 29 
ah MUL SARC toate fectaAia Seon ee 305.) 51 
as du doigt médian sans ongle .... 48 48 
ee de longle médian ...... miasevaphte 16 §=612 
5% TT ie ia ARE el 5S 5 14 14 
si de Vongle postérienr.._......:. 11° 10 
Cet oiseau se tient sur les hautes montagnes de la contrée*, 
habitées aussi par le Megaloperdir caucasicus. Il nous reste mainte- 
nant a étudier ses habitudes et son aire de dispersion. 
Je saisis avec plaisir cette occasion pour rendre hommage 4 mon 
ami Louis Mlokosiewicz, qui avec une persévérance digne d’admi- 
ration ne cesse de recueillir dans la Géorgie Russe, au milieu de 
mille difficultés, tout ce qui peut enrichir le domaine de Phistoire 
naturelle, et qui a si justement apprécié, aprés l’avoir découvert, les 
caractéres spécifiques du bel oiseau que je viens de décrire. 
April 6, 1875. 
Dr. E. Hamilton, V.P., in the Chair. 
A letter was read from Dr. G. Hartlaub, F.M.Z.S., in which he 
stated that Dr. Finsch and he had come to the conclusicn, from the 
study of additional examples, that Lobiospiza notabilis (the supposed 
new Finch from the Navigator Islands), described and figured by 
them in the Society’s ‘ Proceedings’ for 1870 (p. 817, pl. xlix.) from 
a single specimen in spirits, was probably only the young bird of 
Amblyura cyanovirens. 
Mr. A. G. Butler, F.Z.S., read a “ Revision of the Heterocerous 
Lepidoptera of the family Sphingide.” This memoir will be 
printed in the Society’s ‘ Transactions.’ 
Mr. Osbert Salvin, F.R.S., read a memoir on the Avifauna of the 
Galapagos archipelago, of which the following is an abstract. 
The Galapagos archipeiago consists of a group of fifteen islands, 
together with a number of outlying rocks. Of the former, seven are 
considerably larger than the rest, one of them, Albemarle, being as 
large as all the others put together. The group is situated about 600 
miles from the west coast of Ecuador, and lies under the equator. 
All the islands are of volcanic origin, the number of craters being 
computed to be as many as 2000. ‘The most western of the islands, 
* Montagne de Bogosch aux environs de Zakataly, non loin de la route de 
Tiflis a Derbent, 42° lat, bor., 111° long. de Ferro. 
