74 DR. P. L. SCLATER ON A NEW CHAUNA. [Feb. 23, 
and bronzy green; under tail-coverts beautiful grass-green, those 
nearest the body largely tipped with white; bill orange, tipped with 
black ; tarsi and feet olive. 
Total length 64 inches, bill 4, wing 44, tail 33, tarsi 3. 
Hab. Siam. 
Remark. This very beautiful species is nearly allied to the Chry- 
sococcyx hodgsoni of Moore (C. smaragdineus, Blyth) and C. 
wanthorhynchus of Horsfield. It was sent to me from Siam by Sir 
Robert Schomburgk, Her Britannic Majesty’s Consul-General for 
that country ; and I have named it in honour of one whose devotion 
to natural science is well known, and to whose merits in this respect 
I have had the pleasure of bearing testimony upon several previous 
occasions. 
5. On THE SPECIES OF THE GENUS CHaAuNA. By P. L. Scuater, 
M.A., Pu.D., F.R.S., SecRETARY TO THE SOCIETY. 
(Plate XI.) 
In my paper on some new and interesting additions to the Mena- 
gerie, read before this Society last November*, I mentioned the 
acquisition of several specimens of a Crested Screamer (Chauna) from 
the neighbourhood of Cartagena, New Granada, which had been ob- 
tained for us through the exertions of our Corresponding Member 
Mr. Greey. Struck with the difference exhibited by these New 
Granadian birds from the ordinary Brazilian Chauna chavaria, I had 
at first considered them to belong to the scarce and little-known 
Central-American species Chauna derbiana, and under this name the 
fine living specimen received in July 1863, which still ornaments our 
aviary, was figured in the ‘Illustrated London News’ for October 
3rd, 1863. I became, however, afterwards persuaded, by reference 
to former authorities, that I had erred in my identification, and that 
the New Granadian bird was more nearly allied to the Brazilian 
Chauna chavaria, and under this name I spoke of it in my commu- 
nication referred to above. But within these last few weeks one of 
the dead specimens of this bird received from Mr. Greey having 
been mounted and placed in the British Museum, in close proximity 
to Brazilian examples of the true Chauna chavaria, I have had the 
opportunity of comparing them together, and have again somewhat 
modified my opinions as regards the New Granadian bird. _ It is, in 
fact, evidently intermediate in characters, as in geographical posi- 
tion, between the two former known species ; and, as four specimens 
received from the same locality present similar appearances, I do not 
hesitate to characterize it as a third species of the genus, under the 
name of Chauna nigricollis, its most obvious distinguishing character 
from Chauna chavaria being the distinct black neck. This is conti- 
nued upwards to the white throat and cheeks, from which it is se- 
parated by a well-marked boundary. 
* See P. Z.S. 1863, p. 377. 
