1875.] MR. P. L. SCLATER ON SOME RARE PARROTS. a9 
Genus Bettongia (including all the others of the group except 
B. rufescens). Auditory bulla much inflated; palatine 
foramina as in Hypsiprymnus; ridges on premolars 
numerous and oblique ; head short. 
Genus Apyprymnus* (including only Bettongia rufescens 
of Gould). Auditory bulla not inflated; palatine fora- 
mina absent; head short; tarsus considerably longer 
than in the two other genera. 
It should be mentioned that the visceral anatomy of Apyprymnus 
rufescens has not been published, and that Mr. Waterhouse divides 
the genus Hypsiprymnus into three subgenera corresponding exactly 
with the three genera here defined. 
My best thanks are due both to Mr. Sclater and to Dr. Giinther 
for the very kind way in which both these gentlemen have assisted 
me in my study of this subject. 
EXPLANATION OF THE PLATES. 
Prats VII. 
Lateral superior and inferior views of the skull of Dorcopsis luctuosa, natural size. 
Prats VIII. 
View of the inferior surface of the neck of Dorcopsis luctuosa, showing the 
median gland with four orifices situated in the hyoid region. The positions 
of the large parotid and small submaxillary glands are indicated by dotted 
lines. 
Prats IX. 
Teeth, twice the natural size, of (figs. 1-5) Dorcopsis luctuosa, (figs. 6-10) Dor- 
copsis miillert, and (figs. 11-15) Macropus brunti. The upper two rows 
represent the left upper premolar, the third and fourth rows the upper 
and lower third left molar, and the bottom row the incisors. 
2. On some rare Parrots living in the Society’s Gardens. 
By P. L. Scrarer, M.A., Ph.D., F.R.S., Secretary to the 
Society. 
[Received January 30, 1875.] 
(Plates X. & XL) 
The determination of the Parrots in the Society’s collection, aided 
by Dr. Finsch’s excellent Monograph, I do not usually find a difficult 
task. But several of the more recent accessions have caused me some 
little trouble, and rendered investigations necessary, concerning the re- 
sults of which, I think, a few notes may be acceptable to naturalists. 
In the Society’s ‘Proceedings’ for 1871 (p. 490 et segq.) I di- 
stinguished a new species of white Cockatoo from a specimen living 
in the Gardens as Cacatua gymnopis +, and took occasion to point 
out the differences between it and its two allies Cacatua ducorpsi and 
C. sanguinea, of which living examples were also then in the collection. 
* This term I propose for Mr. Waterhouse’s first section of Hypsiprymnus, 
which he has left without any Latin name. : 
t The type of this species is still alive in the Gardens; and we have also a 
second specimen, purchased Feb. 15, 1872. 
