— 149 — 



appears to me as if Z e d 1 i t z ' s opinion (J. f. 0. 1916, p. 2) 

 that percivali is not a form of larvatus should be correct. In 

 any case I agree with him in this, that as long as it cannot be 

 proved that along with the "form-circle" of monachus and lar- 

 vatus there is yet a third, it is wisest to name percivali a binary. 



Oriolus percivali Grant. — Bull. Brit. Orn. Club, XIV, 

 1903, p. 18. 



1 (5 ad. 5. 5. Londiani. - S <S6 ad. 21., 31. 5. and 23. 7. ; 3 <S6 juv. 22. 5. 

 Mount Elgon, 7.000 ft. 



This species occurred rather abundantly in the depths of 

 the dense forests on the eastern slopes of Mount Elgon up to 

 7.000 ft. — I have made the same observation as Lonnberg, 

 that the bird always replies if one repeats its simple song. This 

 usually consists of only a few notes (2 or 3), commencing with 

 one or two short notes and then followed by a long one, the 

 latter a few tones higher. If one varies the bird's song to ^ — ^ 

 or anything else, it will reply by repeating this strain. Some- 

 times I heard the bird far away in the forest, but as soon as I 

 began to imitate its cry it came nearer, and if I kept on for a 

 little while I would suddenly hear its cry high above me in the 

 dense foliage. Now, whether it is from curiosity or from the 

 desire to take up the fight with a competitor, at close quarters 

 I am unable to say, but the specimens I shot were always lured 

 to me in this way. 



Judging from my specimens it seems to me as if percivali 

 has the yellow underparts of the body mingled with a pale ad- 

 mixture of green. In any case it appears as if the yellow was 

 darker than in rolleti. The colour of the upper tail -coverts 

 varies from olive-green to yellowish green. A male, shot on the 

 31st May, had swollen testes. 



The measurments for the 4 ad. cfcT are: 

 Wing, tarsus, culmen, 



These measurements agree very well with those given by 

 Lonnberg for his specimen, but not so well with Reich enow 's 

 (Yog. Afr. III. p. 836) 140 mm. (after the original description). 



The young birds have the feathers of the throat black with 

 olive-green edgings. The breast is not, as in rolleti, furnished 

 with black streaks, but is entirely yellowish green. Bill black 

 or basal half, reddish brown, anterior half black. 



One of the young birds — shot on the same day and in 

 the same spot as the other two — has the three central tail- 



