BIRDS OF ETHIOPIA AND KENYA COLONY 61 



as Adis Abeba. This form resembles caesia but is very slightly 

 smaller, the chief difference being in the bill, which is noticeably 

 narrower and less robust in pura. 



3, G. caesia preussi: Cameroon. In this form the throat is darker, 

 a deep slate-black in the males, and the size is generally smaller than 

 in the nominate form (wings 110-117 mm as against 116-128.5 mm 

 in pura, and 128-132 mm in caesia). 



The coloration varies considerably in intensity in a series of 13 

 specimens of pura examined, the two extremes being noticeably dif- 

 ferent in shade. This nongeogi"aphic variation (the darkest and the 

 lightest birds come from the same locality) supports Gyldenstolpe's 

 discussion ^^ of van Someren's statement ^^ that "the series in the 

 Tring Museum from British East Africa, west to Lake Kivu, shows 

 two distinct forms, those from the Kivu district being darker and 

 smaller." Gyldenstolpe finds that this difference does not hold. 



It is rather strange that this caterpillar-shrike sould be unknown 

 in most of Uganda, especially since it occurs on the Uganda-Congo 

 border (in the Ruwenzori range) and on the Uganda-Kenya border 

 (Mount Elgon). The only plausible explanation appears to be the 

 question of altitude, most of Uganda being too low for this bird, 

 which is chiefly a denizen of mountain forests. In Ethiopia, Neu- 

 mann ^" found it in the thickest, darkest parts of the forests at alti- 

 tudes of 7,200 to 9,200 feet. Similarly, Erlanger «° found it only on 

 wooded mountains in that country. 



According to Neumann, the breeding season in Ethiopia is in Feb- 

 ruary and March. Van Someren ^^ found the birds breeding in June, 

 and he obtained young just out of the nest in July. 



Family DICRURIDAE, Drongos 



DICRURUS ADSEVIILIS DIVARICATUS (Lichtenstein) 



Muscicapa divaricata Lichtenstein, Verzeichniss der Doubletten des zoologis- 



chen Museums . . . zu Berlin, etc., p. 52, 1823 : SenegaL 

 Spek;imens collected: 



5 adult males, 1 adult female, 1 unsexed, Dire Daoua, Ethiopia, December 

 2-21, 1911. 



1 unsexed, Ourso, Ethiopia, no date. 



1 adult female, Sadi Malka, Ethiopia, January 27, 1912. 



1 adult male, 1 adult female, Hawash River, Ethiopia, February 10, 1912. 



1 ndult male, no locality, Ethiopia, March 3, 1912, 



1 adult female, Lake Abaya, southeast, Ethiopia, March 21, 1912. 



8 adult males, 7 adult females, 1 unsexed, 2 immature males, 8 immature 

 females, Gato River near Gardula, Ethiopia, March 30-May 11, 1912. 



^'Kongl. Svenska Vet.-Akad. Handl., 1924, pp. 192-193. 



=«Ibis, 1916, p. 385. 



»Journ. fiir Orn., 1905, p. 213. 



"Ibid., p. 688. 



"Nov. Zool., vol. 37, p. 299, 1932. 



