1882. ] DR. W. BLASIUS ON BIRDS FROM CERAM. 703 
The females of RA. undulatus sent from Borneo by Dr. Platen 
strikingly resemble the females of Rh. plicatus. I have already 
drawn attention to the fact that the ridges on the sides of the 
base of the bill are very little or even not at all marked in young 
specimens of RA. undulatus; so that the characteristic features on 
which Salvadori (i. p. 398) chiefly founds his belief in the possibility 
of distinguishing the females of the two species may be entirely 
obliterated. Under these circumstances it appears to me not super- 
fluous to point out some differences in the colouring of the iris and 
the naked parts, which are founded on Dr. Platen’s careful obser- 
vations. 
Rh. undulatus. Female: “iris (like that of the male) orange. 
Naked skin of the throat—front third light blue, back third dark 
blue, separated by a black band ; while the old male has the back 
third of the throat-skin light green, the front one yellow, divided 
by a dark green stripe; and the young male hasa uniform lemon- 
coloured throat-skin, or a lemon-coloured one divided by a yellowish- 
green stripe.” 
Rh. plicatus. Female: “iris grey-brown (of the male orange). 
Naked skin of the throat (like that of the male) bluish white.” 
The difficulty of the distinction exists only for the female, which 
is in both species entirely black with the exception of the white tail ; 
while the male of RA. plicatus is easily to be distinguished from 
th. undulatus by the completely brown-red neck (the present speci- 
mens from Ceram have a dark chestnut-brown colouring towards the 
back, lighter towards the front, and lightest on the chin). The female 
of the present species is much smaller than the male, as is already 
proved by the measurements taken by Dr. Platen while the birds were 
fresh. To render these differences more obvious, as well as to give 
the possibility of comparison with some measurements of Rh. undu- 
latus, I add the following dimensions :— 
Cauda. Ala. Tarsus. Rostri crista. Rictus. 
em. cm, em. cm. em. 
Waves Low 42°7 5'2 13:0 22°0 
emit ho 40°5 5°5 13-0 21-2 
ATs ened! Be: 41°5 5°5 13°3 22:0 
4. g. 28:0 43°0 58 11°5 to 13 em. 22°2 
Deke iLO 41°5 ob 11°8 26 
6.929.273 410 50 107 18-3 
(RET P40) 38°5 5:0 12°0 GAG} 
§.. Oy, 20:0 39°0 oo Hes 19°1 
9. 9. 268 40°0 Li 9°] 17°4 
Nos. 4 and 8 are in the Brunswick Museum; Nos. 1 and 7 in the 
Museum Heineanum ; No. 2 in the collection of Mr. Nehrkorn. 
9. ALcEDo 1spipo1pEs, Less., Salvad. i. p. 408. 
“Male. Iris brows. L. 15:5 em., D. 2 cm. Bili black, feet 
red-brown. Lokki, Ceram, 20 November 1881.” 
The specimen exactly agrees with the description of Salvadori, and 
Proc. Zoou. Soc.—1882, No. XLVII. 47 
