60 Mr. F. J. Jackson on Bh'ds 



Breeding. Nest a slight structure of dry grass in a tuft, 

 the long blades woven over the top forming a dome. 



No. 1201. $ ad. Naudi, G500 feet, June 11, 1898. 



[When Professor Reichenow was in England he showed 

 me the type of a Grass-Warbler which he proposed to call 

 C. nachalis. It was a small form of C. erythroyenys, and 

 measured : total length 4-2 inches, culmen 0*55, wing 2-2, 

 tail 1*5, tarsus 0'95. 



I identify with this C. nuchalis a female bird from Nandi 

 (No. 147), which has the wing 2*3 and the tail 1'6 inches. I 

 find, moreover, that it is the same species which in 1892 I 

 identified as C. erythrogenys from Sotik and Mount Elgon 

 (Ibis, 1892, p. 157), and the series collected by Mr. Jackson 

 shows that it is the common species of the country. 



It is very much smaller than the true C. erythrogenys, 

 which I now believe to be confined to Abyssinia. The latter 

 is a large bird, conspicuously rufous on the wing-coverts 

 and external aspect of the quills ; the thighs, vent, and 

 under tail-coverts are deep fawn-colour, almost cinnamon. 

 It has no blackish streaks or lines on the flanks. 



The bird which I identify as C. nuchalis has more or less 

 distinct lines of black or dusky brown on the sides of the 

 body. 



The following are the dimensions of Mr. Jackson's series 

 of specimens, which vary somewhat, as they have been col- 

 lected at different times of the year, and of course those 

 in summer plumage are always smaller : — 

 S. Wing 2-6-2-8 inches, tail 1-75-2-0. 

 $. „ 2-25-2-4 inches, „ l-6-r8. 



Then there is a third race, C. ambigua Sharpe, which has 

 also been identified with C. erythrogenys. It is the bird from 

 Machako's and N'gong obtained by Dr. Hinde (Ibis, 1900, 

 p. 498). It is smaller than C. erythrogenys, and of about 

 the same size as C. nuchalis. It may perhaps be identical 

 with the latter, but at present I think that it may be dis- 

 tinguished by the absence of streaks on the flanks. The 

 measurements are as follows : — 



