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Show 326 MR. W. H. HUDSON ON THE BIRDS OF BUENOS AYRES. [May to be restricted to Abyssinia and Sennaar so far south is certainly noteworthy although not unprecedented fact. Sternum of Pelomedusa from the Zambesi (nat. size). " O n the Lower Zambesi Dr. Peters found P. galeata, the common species of the Cape Colony (with which P. nigra, Gray, of Natal, is, in m y opinion, identical*) abundant." The following (twelfthf) letter on the ornithology of Buenos Ayres, addressed to the Secretary by Mr. W . H . Hudson, C.M.Z.S., was read : „ Buenos Ayres, septemher 22, 1870. " D E A R S I R , - A s I have so far always made the species that interested m e most at the moment of writing the subject of m y letters, I will now say something of the Swallows of this country; for these ever welcome little emigrants are at present hourly arriving and scattering themselves far and wide over the plains of Buenos Ayres. * See also Straueh, M e m . Ac. St. Petersb. ser. 7, vol. viii. p. 111. t See antea p. 258, for eleventh letter. |