644 Messrs. Sclater and Mackworth-Praed on [Ibis, 



[Amorge), and the Charada forest in southern Abyssinia 

 (Zaphiro), which we are unable to distinguish from the 

 Uganda bird. 



With regard to C. mabira (Someren, Bull. B. O. C. xxxv, 

 1915, p. 116), this species, of which we have examined the 

 type and two other examples at Tring, is as nearly as 

 possible intermediate between C. solitarius and C. gahonensis. 



Of C. gahonensis we have examples from Gaboon and 

 Cameroon [Bates). There is a good description of this forxn 

 in the Catalogue (vol. xix. p. 259), and it need not detain 

 us here. We cannot accept C aurivillii Sjost. from Cameroon 

 as distinct from C. gahonensis, as the character of the absence 

 of the white spot of the tail is obviously a variable one. 



The relationship of the solitarius group with C. cJamosus, 

 the Black Cuckoo, which is also found all over Africa, is 

 very obscure, as is also the relationship of C. solitarius and 

 G. gahonensis. There appear to be a series of intermediate 

 forms (which has been called Cjacksuni) between C. clamosus 

 and C. solitarius. Tliere is also a series of intermediate 

 forms (called C. mabirce) between C. gahonensis and C. 

 solitarius. \t is possible that these may be regarded either 

 as three separate species intergrading in certain areas, or as 

 three species in pi'ocess of evolution from one form within 

 those areas. 



The type of C. mahirce has practically no barring on 

 the undersidf, but we regard this as unusual, as the other 

 specimens are barred as in C. solitarius. 



Chrysococcyx caprius. 



Cuculus caprius Boddaert, Tabl. PI. Enlum. 1783, p. 40 : 

 Cape of Good Hope. 



[B. coll.] 1 juv. nr. Gigging summer, Mon. 



The Emerald Cuckoo is recorded from Fazogli by Ileuglin, 

 but is evidently a rare bird in the Sudan. It is more 

 abuiuiant in southern Abyssinia, and there is a good series 

 in the Museum from the Jirama and Kafla districts collected 

 by Zaphiro. 



We follow Claude Grant (Ibis, 1915, p. 417) in his 

 conclusions in regard to nomenclature. 



