91 | Vol. xl. 
moult ; (2) both species were sometimes found breeding 
together; (5) the general shape and proportions were 
rather different. 
Finally, Mr. Bonhote pointed out that, except in a few 
very special cases, no two forms of the same species could 
breed in the same area, and that when two closely allied 
forms were found breeding in the same locality they must 
be considered true species. ; 
Concerning Mr. Bonhote’s remarks that sexual dimor- 
phism might be regarded as a specific character, Dr. HRNst 
Harrert said he could not fully agree with this view. On 
the contrary, he considered that, where the males of two forms 
were practically indistinguishable but the females differed, 
these were very decided subspecies—supposing, of course, that 
they were geographical representatives. In the case quoted 
by Mr. Bonhote, moreover, it should be remembered that in 
Algeria and Tunesia, where the females were different, there 
was often a decided approach to the male plumage, in so far as 
many females had black throats, reves they did not attain 
a black back. 
Mr. MeapEe-Watpo exhibited a clutch of two eggs of 
the Hooded Crane, Grus monachus, on behalf of Mr. W. H. 
St. Quintin of Scampston Hall, Yorkshire. These were 
laid in captivity by a bird obtained in 1913 from Herr 
Hagenbeck. He remarked that Grus monachus was one of 
the rarest of Cranes, confined to a small area in Central 
Siberia. 
Two eggs of the Japanese Whifecneskted Crane, G. leu- 
cauchen, were also shown, these also having been laid in 
Mr. St. Quintin’s eeiecied by a bird bred at Lilford Hall, 
Oundle. 
Dr. vAN SoMEREN sent descriptions of the following new 
species and subspecies from Hast Africa and Uganda :— 
Cercomela turkana, sp. nov. 
This bird is nearest to fuscicaudata Blanf. in type of 
plumage—. e., having the tail the same colour as the mantle,— 
