INTRODUCTORY NOTE 
T he first part of Mr. Laidlaw’s paper now published contains an account 
of a small section of the Odonata that, in the Malay Peninsula at any 
rate, is especially characteristic of the true jungle fauna. In the 
Patani States it is almost certain that it does not occur on the lower reaches 
of the rivers, nor, indeed, except in districts where the primaeval forest has 
been but little interfered with. 
The species seem to be dependent on the presence of rapid running 
streams of clear water from which, with but few exceptions, they are rarely 
found far distant. It will be noted that the whole of our collection was 
obtained in three localities, and that more than two-thirds of the total number 
of specimens were captured in less than a week at Mabek in the Hulu Jalor, 
where the richness of the Odonate fauna far exceeded anything that we met 
with elsewhere. Dragon flies were very numerous at Bukit Besar, but for 
some reason, were exceedingly scarce at Telom in January, where only three 
or four species were even seen, and with the exception of a few of the 
commoner rice-field forms, this scarcity was almost as noticeable in every place 
we visited in South Perak, during January and February, 1902, except at Jor. 
The present list includes all the species of Agrioninae known to occur in 
the Peninsula, twenty-two in number, of which our collection contains 
representatives of eleven, though it is not improbable that this number will 
be largely increased when the mountainous districts of the Peninsula have 
been more fully explored. 
HERBERT C. ROBINSON 
