142 JOURNAL, NATURAL HIST. SOCIETY OF SIAM Vol. I 
Being July, the S. W. Monsoon was at its height and my werk was 
greatly hindered by mist. Heavy rain fell daily, but fortunately the 
leaves of a broad-leaved palm were available for roofing. 
At this time, of my 32 coolies, only 10 were available for work, 
12 went to and fro to the “‘Klephant’s Tusk” depot for rice, and one- 
third were always down with malaria. Of the gang sent back for rice, 
three men preferred the excitement of rafting down the rapids (on a 
few bamboo poles strung together) to the drudgery of scrambling along 
the cut path on the banks, and in consequence were laid up for several 
weeks with bad wounds. Added to the climatic discomforts was the fact 
that we were constantly short of rice, owing to the ferry raft breaking 
away on one trip, when a considerable amount of rice was lost. 
On this ridge I met a species of black langur (Presbytis 
femoralis) not previously observed elsewhere. 
This species is less robust in form than the other species 
_inhabiting Petchaburi, viz. P. obscurus, and was not ebserved at 
elevations below 800 metres. The fur is woollier than in other species, 
and the young appear to be black or dark-coloured in early life. The call, 
which may be rendered ‘‘oo-o0-terruk”, is entirely different from that of 
P. obscurus or germaini, and it lacks the hoarse bark of these two species. 
The Northern limit of P. femoralis appears to be N. Lat 13% 50’, where 
the boundary range drops to 350 metres elevation and is crossed by a 
belt of deciduous dry jungle, which would appear to be unsuitable for 
the species. From here it ranges down to Singapore, though the 
‘Malayan type has considerably more white on the belly and underparts 
than any specimens obtained by me. 
The White-handed Gibbon (Hylobates lar) was also obtained 
here, and was found to have a good deal of fat on the shoulders and 
back, possibly affording it some protection against the awful weather. 
The hill men (Karangs) have also observed that the gibbon is very fat 
during the rains. The species is most variable, ranging from a dirty 
straw colour to black, but the hair on hands and feet is invariably 
white, as also is a ring round the face. 
On this ridge was found a very big herd of Stump-tailed 
Macacques (probably M. rufescens), and hearing them before seeing 
them I thought the sound was that of a pack of wild dogs quarrelling 
overa carcase. The adults galloped off leaving the youngsters to 
make their way to the tree tops. Fullowing the game track on top of the 
