613 
Birds of Southern Cameroon. 
have been measured. They vary in length from 16*5 to 
18*5 mm., and in width only from 12*5 to 13*5 mm. Those 
of one clutch are nearly always of the same width, though 
they vary in length. As these eggs vary greatly in colouring, 
it may be worth while to say that they are all identified as 
those of Cisticola erythrops y the sitting bird having been 
carefully compared in every case with my specimens. I was 
Text-fig. 18. 
A B 
Tongues of Cisticola erythrops , see p. 612. 
A, of nestling. B, of adult bird. 
the more particular to do this because, as I thought, there 
was more than one species of Cisticola ; there were two at 
Efulen, but only one has been found at Bitye. 
[In addition to the eggs which have already been described 
( f Ibis/ 1909, p. 68) we find examples with the ground pale 
greenish-white very finely mottled, and others with the 
ground creamy-white blotched and spotted with light red 
and lilac.—W. R. 0.-G\] 
Calamocichla rufescens. [Oto'o-bisong.] (Plate XIL 
fig. 16, egg.) (Text-fig. 19, A, p. 614.) 
Neumann, Novit. Zool. xv. 1908, p. 244, ff. 
Calamocichla poensis Sharpe, Ibis, 1908, p. 318; Bates, 
Ibis, 1909, p. 69. 
Three nests of Oto'o-bisong have been found and brought 
ser. ix. — VOL. v. 2 T 
