These results indicate that this sample of patchouli oil from the 
Kellas Estate is of fair quality, and that it conforms to the general 
type of patchouli oils exported from Singapore. 
Commercial Valuation. 
A small sample of the oil was submitted, together with the results 
of its chemical examination, to a firm of manufacturing perfumers 
for commercial valuation. It is reported that the oil would pro- 
bably be worth about i6r. per pound at present. It is also stated 
that there has been a marked decrease in the consumption of pat- 
chouli oil in perfumery in recent years, and that this, in conjunc- 
tion with over-production in the Federated Malay States, Java and 
Indo-China, has led to low prices for this oil. 
The results of the investigation of these two oils show that they 
are both of good quality and compare favourably in composition 
with oils of the same type already imported into this country, and 
that consignments would probably fetch good prices on the London 
market. 
(Sd.) WYNDHAM R. DUNSTAN. 
1 6 th "June, 1905. 
ON 3 INSECT PESTS OF MANGO TREES. 
By J. Hewitt. 
In the month of August of this year a gentleman living in Ku- 
chfng called my attention to the sickly condition of many of his 
Mango trees. On inspection ‘it was found that whole branches 
gradually withered and died although the tree as a whole retained 
its vitality. It was obvious that this was the ravages of some 
insect for on splitting the dying branches one found the wood 
penetrated by long tunnels which reached sometimes a length of 
several feet. Apparently one individual insect can do much damage 
for in these borings one branch never lodged more than one insect. 
This was a large white fat grab with a small head and swollen 
thorax, the anterior thoracic segment in particular being enlarged : 
the thorax was provided with 3 pairs of rudimentary legs. The 
abdomen was conspicuously segmented'; dorsally and ventrally all 
the segments — with the exception of the last 2 abdominal, and the 
first thoracic dorsally — bear tuberculated humps which seem to 
subserve a gripping function. The length of the larva was 2 inches 
or more. Fortunately I was able to find one adult insect and to rear 
a pupa. As one could expect from a larva of the type des- 
cribed it belonged to the longicorn beetles, the actual species being 
Rhytidodera simulans White. This beetlo of length usually just 
over an inch, is of a dull reddish brown colour marked with yellowish 
spots which on the elytra are longitudinally elongated and arranged 
so as to mark it irregularly by transverse bands. 
