— 100 — 



To try to establish, on the basis of the discovery of o n e 

 nest, what is the rule or the exception is certainly difficult. 

 Whether the nesting -place of this species was in the present 

 case only a deviation from the usual method or not, is difficult 

 to judge. The natives, 1 know, assert that this bird always 

 builds its nest among the stones — at least on Elgon — but 

 whether this is true or not later discoveries must decide. 



C a b a n i s mentions further (op. cit.) that the contents of 

 the stomach consisted of berries which looked like beans. In 

 the five individuals I brought home (and in two more which 

 were destroyed) 1 have found large, hairy insects, grit and stones 

 but only in one of them small, hard fruits, 

 wing, total length, tarsus, tail, culmeu, casque, 



360 mm. 740 mm. 52 mm. 290 mm. 168 mm. 105 mm. cTad. 

 375 mm. 790 mm. 58 mm. 305 mm. 190 mm. 135mm. 9ad. 



Irides brown; bill blackish; the front one-third of the cas- 

 que black, the rest yellowish. Legs black. 



The young birds, in a rather young stage are very unlike 

 the old; one, having the following measurements: 

 wing, total length, tarsus, tail, culmen, 

 315 mm. 640 mm. 48 mm. 260 mm. 100 mm. 9 j^v. 

 has not yet grown a distinct casque, but the culmen was swollen 

 only in the upper edge at the base and was yellowish white in 

 colour. The colour of the rest of the bill was dark plumbeous. 

 The feathers of the head, which even in fuligrown young (and 

 the old) are edged with grey at the tips, are in this case en- 

 tirely rusty- brown with a black streak, widening towards the 

 tips along the shaft. The feathers of the throat are grey, some 

 with a pale brown wash. In other respects it resembles the 

 full-grown birds, but the lower surface has not yet acquired such a 

 pronounced dark metallic green gloss. 



Irides are greyish brown. Legs black. But neither in this 

 young bird nor in the other two are the two middle rectrices 

 tipped with white but are in all three of them entirely black 

 with a metallic gloss. 



The two other birds have the following measurements: 

 wing, total length, tarsus, tail, culmen, casque, 

 325 mm. 685 mm. 48 mm. 290 mm. 140 mm. 28 mm. 9 juv. 

 320 mm. 690 mm. 48 mm. 280 mm. 142 mm. 30 mm. 9 juv. 



In the colorations of the plumage they are exactly similar 

 to the full-grown, but their bill has quite another appea- 

 rance, in that the posterior end of the casque, which besides 

 being now black, has began to develop. The upper ridge of the 

 culmen is in these two wavy and rough and the bill is furnished 

 with dimpled depressions and ridges. 



Sclater's plate (Proc. Zool. Soc. London 1871, p. 490) 

 of the head of this species shows the bill, with the elevated 



