98 MECOPTERA AND PLANIPENNIA 
and XXVIII of this periodical, and must be separated as 
another order of insects, Megaloptera. They are also thorough- 
ly studied by me in behalf of the „Catalogue Sélys”. 
The Dilaridae, which are very related to the Osmylidae 
and often united with them, are characterised by the pectinate 
antennae and by the long ovipositor of the female. Probably 
some species are also to be discovered in Insulinde. Their 
biology is wholly unknown. 
By careful collecting and observing many novelties are 
surely to be discovered of these curious and primitive insects, - 
which are probably the praecurrents of the other orders 
of holometabolic insects. 
Leyden, October 1908. 
Notes from the Leyden Museum, Vol. Xx XXI. 
