78 
nape. The hands and feet are short; the fore-thumb is small, the 
hinder one rather large and broad. 
Hab. West Africa? 
This species is very like Presbytis obscurus, but it is blacker, and 
has no pale spot on the nape, and the hair of the body is much 
longer, more silky, and forms a compressed crest on the nape, which 
is quite wanting in P. obscurus. 
It is more like P. melalophus, but differs from it in being black, 
and can scarcely be a black variety of that species. 
Str Roperick Murcurson exhibited the head of a fish belong- 
ing to the genus Clarias, from the river Limpopo, and a portion of 
the skull of Phacocherus ethiopicus, which had been collected by 
Capt. Vardon, during his recent travels in South Africa. The Clarias 
had been seen by Mr. Oswell; and identified by him as being a species 
also found in the river Zonga, which flows out of the newly discovered 
Lake. In directing the attention of the meeting to what may be re- 
garded as the first indication which has reached us of the zoology of 
that most interesting region, Sir Roderick Murchison gave a summary 
of the knowledge already obtained by African explorers of the cha- 
racter of the country surrounding the Lake, and of the speculations in 
physical geography to which their discoveries have given rise. 
Mr. R. C. Griffith exhibited some specimens of the “ Tstetze,”’ 
which had been entrusted to him for that purpose by Capt. Vardon. 
Sir Roderick Murchison having given some account of the supposed 
effects of the sting of this fly, Mr. Westwood undertook to describe 
the insect more particularly, as it appeared to be new to science, at a 
future meeting of the Society. 
The Secretary exhibited some cocoons of a species of Saturnia, 
“the famous wild silk-worm from Leotang in Mantchouria,” which 
had been transmitted to this country by Mr. Rutherford Aleock, Her 
Majesty’s Vice-Consul at Shanghae, and obligingly presented to the 
Society by Dr. Lindley. 
April 23, 1850. 
R. H. Solly, Esq., F.R.S., in the Chair. 
The Secretary reported that he had received a letter from Lord 
Harris, Governor of Trinidad, announcing his Excellency’s intention 
of presenting some living animals from that island, and from Venezuela, 
to the Society. 
The Secretary also stated that he had succeeded in purchasing for 
the Menagerie two healthy young specimens of Phacocherus ethio- 
picus, the Vlack Vark, from Port Natal. They are stated by the im- 
porter to be about fifteen months old. (Mammalia, Pl. XVII.) 
