January 24, 1837. 

 Rev. John Barlow, in the Chair. 



Mr. Gould exhibited the Raptorial Birds included in the coUec 

 tion recently presented to the Society by Charles Danvin E«q and 

 after some general obsenations upon the geographical distribution 

 of the known species, proceeded to characterize the foUowinc as 

 new to science : ° 



PoLYBOROs GALAPAGOENSis. Pol. irUensė fusctis ; primariis ni- 

 gns; secondanarum pogoniis intemis albo etfusco transversim 

 stnatis; caudd ctnerascenfi-fuscd, transversim lineis anaustis 

 et freguenhbus tntense fuscis notatd ; rostro obscure comeo- 

 peaious ohvaceo-Jiavis. ' 



Long. tot. 20 unc; rostri, U- al(B, 141; caud(B, 9; tom. 3^. 



Foem. jun. Capite et corpore intensi stramineis fuscogue varieaa- 



tis; tilo in pectore et abdomine pra^alente ; primariis fusco- 



nigrts; caiidis rectricum, pogoniis extemis cinerascenti-fuscis 



internts paUide-rosaceis ; utrisąue lineis angustis et freauenti- 



bus fuscts transversim striatis, apicibus sordide atbis -rostro 



mgrescenti-fusco ; pedibus olivaceo-flavis. ' 



Long. tot. 22 unc. ; rostri U; alce, 17; candce, lOi; tarsi. 3į. 



Obs. Were I not assured by Mr. Darwinthatthehabitsofthisbird 



stnctlycomcide with those of the C'aracara (Po/y&orz.. ^ra^j7ie««,). 



its mode of flight and cry bemg precisely the šame. I should hav-ė 



been induced to reg^d it as rather belonging to the genus Buteo 



than to Polybo-rus; but as I have satisfactorily ascertained bv a 



close investigation, it forms a beautiful inten-ening link between 



these genera, as is evidenced by the scaHng of the tarsi and the 



produced form of the beak; while its habits place it within the 



hmits of the latter genus. 



It is on the authority of Mr. Darwin also that I rely for the a", 

 surance of the two birds above described being the malė and the 

 female of the šame species, so great is the diflPerence between them 

 both m size and colour. 



Hab. In insulis Galapagorum. 



PoLTBORus (Phalcobsnus) ALB0GUXARis. Pol. fuscescenH-fiiger, 

 margi7itbus plumarum inter scapulos fvlvis ; primariis secon- 

 duriisgt^ albo adapicem notatis ; gula pectore corporegue subtus 

 albis; latenbusfusco sparsis ; rostro livido; cerdflavd ; tarsis 



OtiZ'VCtCCtSm 



Long tot. 20 unc ; rostri, U; alce, lą- cavd^, 9; tarsi, 3. 



Ubs. I have some doubts as to whether this bird may not eventuallv 

 prove to be a vanety of Phalcobcenus montana. D'Orb. The nrin 

 cipaldiffercnce between this bird and the one described and figurcd 



