Ornithology of Borneo, 269 



castaneicaudatiis ; but it already shows the commencement of 

 a spur on tlie leg. 



No. 3 is a bird in dark rufous-brown j^lumage, a little 

 darker than the " female '' figured by ]\Ir. Gould as L. casta- 

 neicaudatus, and which^ I have little doubt now, is really the 

 young male in his first dress. Mr. Treacher's bird, however, 

 has a few of the blue metallic-tipped feathers of the adult 

 appearing on the lower back and rump ; the head is densely 

 feathered, and the only bare part is the region in front of 

 and round the eye ; at the base of the lower mandible and on 

 the sides of the crown the elongated wattles are represented 

 by a little knob ; and there is an incipient spur in the leg. 



No. 4 is a somewhat similar bird in more advanced plu- 

 mage. Dotted about all over the upper surface are many of 

 the metallic-tipped feathers of the adult male plumage ; and 

 below the black plumes are also appearing in profusion, as 

 is also the case with the maroon feathers of the neck. The 

 head is still as densely clothed as in the foregoing example, 

 the bare space on the sides of the head being about the same 

 in extent, and the incipient wattles equally developed. True 

 to the characters of the male L. bulweri, the upper tail- 

 coverts are chestnut, like the tail ; and in the shape of the 

 latter there is an evident indication of the forked and diver- 

 ging character which the latter assumes when adult. 



No. 5 is almost in exactly the same plumage as the type of 

 L. castaneicaudatiis, described by me, but retains a few of 

 the chestnut-brown plumes of the immature dress on the 

 neck and wings. The left side of the tail, however, is parti- 

 coloured, and from the midst of a group of chestnut feathers 

 spring a number of the pure white perfect rectrices peculiar 

 to L. bulweri. Here, then, we have the solution of the ques- 

 tion of the two species inhabiting the Lawas river, and L. 

 castaneicaudatus is, after all, that which I supposed it to be, 

 the immature, or at least the second plumage of L. bulweri. 

 The red tail evidently endures longer than the rest of the 

 young plumage ; and last of all is assumed the pure white tail. 

 The full development of the wattles is an affair of even later 

 date, as is also the bare head. 



