22 ON A COLLECTION OF BIRDS 



Hemicercus Hartlauhii, Malh. 



Adult male: Whole upper surface of the head and 

 whole crest lively vermilion. 



Adult female: Upper surface of the head and whole 

 crest entirely gray, with a more or less olivaceous tinge. 



Young male: Entire crown and crest fawn- colored , 

 changing afterwards through orange-red into the vermilion 

 of the adult stage, beginning on the occipital crest and 

 proceeding afterwards onto the forehead. 



H a b. Java , as specimens from other localities , exactly 

 similar to the Javan fully adult male, are still wanting in 

 collections. 



2. Hemicercus sordidus, Eyt. (V). 



Adult male: Entire crown and foremost occipital 

 feathers deep vermilion , perceptibly deeper than in the pre- 

 ceding species , though not crimson as Mr. Hume has called 

 this color ; postoccipital crest olivaceous gray. 



Adult female: Exactly similar to that of the prece- 

 ding species. 



Young male: Entire crown and occipital crest fawn- 

 colored , leaving sometimes the tips to the occipital feathers 

 brown. In a more advanced stage the fawn color of the 

 long feathers of the crest changes gradually — apparently 

 not by a moult — into a dull vermilion, leaving the 

 olive brown tips, where such existed, intact. Further on 

 the worn out red feathers of the crest are replaced in the 

 way of a moult by the gray ones of the fully mature 

 stage. At the same time , also by a moult , the fawn- 

 colored crown becomes speckled by young feathers of a 

 lively vermilion , which at first is the same as in the adult 

 H. concretus , but soon afterwards , when the whole crown 

 has changed into red, assumes its darker appearance. The 

 material upon which these observations are based , is col- 

 lected by the Dutch Scientific Expedition to Sumatra , in 

 1877. Now it happens, that the crown assumes its red 

 appearance before the red crest has changed by moult 

 into gray; it is most probably upon such specimens that 



Notes from the Hieyden JMuseura, Vol. LX.. 



