102 EDW. JACOBSON, PLANIPENNIA FROM JAVA, 
sufficient Aphids and other small insects. It was interesting 
to watch how they turned their victims on their mandibles 
as on a broach, emptying them entirely, so that nothing was 
left but the skin. They did not even spare each other; for 
one of the larvae was killed and sucked dry by its fellows. 
On October 17° they moulted for the second time. As the 
_moulting larvae were often falling victims to those already 
having moulted, their number was gradually reduced, and in 
order to avoid wholesale slaughter, I had to recur to single 
confinement. 
When casting its skin, the larva makes undulating move- 
ments, and freshly moulted it rests curled up on its side, 
waiting till it has become dry and its integument more 
resistant. The eyes always remain dark, the other parts of 
the body being, directly after moulting, of a pale colour. The 
length of the second instar is about 4 mm. 
— Not being able to find enough Aphids for my prisoners, 
I fed them on scale insects, of which the white waxy 
exudations were soon used by the larvae to cover their 
backs with. 
They now rapidly became full-grown and their appearance 
differed from that of the young larvae in the much shorter 
antennae, the darker colour of the head, the broader body 
and the shorter and broader pygidium, as will be seen from 
the figure, given in Dr. van der Weele’s paper. 
The ground colour is now a yellowish grey with pale 
yellow borders; the length is about 7 mm. 
On October 21° three larvae made their cocoons, which 
were spherical, white, and covered with the refuse from the 
backs of the larvae. 
When spinning the cocoon, the larva provides for a trapdoor 
in the same manner, as has been described above for the 
larva of Myrmeleon frontalis. 
The pupa, figuring in Dr. van der Weele’s paper, has a 
