Dr. F. Briiggemann on Pityriasis gymnocephala. 37 
pair of serrate spines. 1p. One of the serrate spines, highly 
magnified. 
Fig. 2. Stimpsonia chelifera, Spence Bate. 2a. Portion of upper antenna, 
showing secondary flagellum. 206. Mandible. 2c. Maxilla. 
2d. Maxilliped. 2e. Second gnathopod. 
Fig. 3. Tail-piece of Stimpsonia chelifera (another specimen), seen from 
above. 3a. One ofthe first gnathopods. 36. One of the second 
gnathopods. 3c. The other of the second gnathopods. 

IV.—On the Young of Pityriasis gymnocephala. 
By Dr. F. BrtGGEMANN. 
THE sexes of this remarkable Bornean bird are known to 
differ in the colour of their plumage, the female showing some 
red spots on the abdomen. A young female, sent by Dr. 
George Fischer from Moeara Teweh, interior of S.. Borneo, 
shows several peculiarities, which I think worth drawing 
attention to. Comparing it with the adult male, a specimen of 
which was also procured in the same locality by Dr. Fischer, 
the signs of its immaturity are found in the smaller terminal 
hook of the upper mandible, in the absence of horny tips to 
the feathers of the hind neck, in the lower stage of develop- 
ment of the rigid feathers on the fore neck, in the pale horn- 
colour of the feet and nails (the adult having the former yel- 
lowish and the latter blackish), and in the sooty-black (not 
deep-glossy-black) plumage. The narrow velvety edgings of 
the black feathers are also less pronounced ; and the red colour 
in the plumage is a shade lighter than in the adult, rather 
scarlet than crimson. 
All this is, of course, nothing curious; but the following 
characters were scarcely to be expected :—The crown of the head 
is entirely bare, without any trace of the papille with which it 
is crowdedly covered in the adult; of the large tuft of rigid 
brownish grey feathers in the auricular region there is no indi- 
cation, the feathers on this spot being of normal structure and 
red, like the rest of the head-feathers; breast, belly, and 
flanks are scarlet-red, somewhat mixed, in an irregular way, 
with black, the basal part of the feathers, or the whole feather, 
excepting a broad border, being generally blackish ; it may be 
observed that the red edgings, which are much decomposed, 
are gradually worn off. The red colour decreases in extent 
on the abdomen, where it is confined to the tips of the feathers. 
There are also traces of red edgings on the scapularies and 
wing-coverts. The thigh-feathers (which are of a uniform 
red in the adult) are black, mixed only in the upper part of 
the thigh with some red ones. 
