68 MECOPTERA AND PLANIPENNIA 
their moulted comrades. When moulting, the larva makes 
undulating movements and freshly moulted it rests on its 
side, waiting till it is dried up. The eyes are always 
dark, the other parts pale. Their form and colour are now 
intermediate between the freshly hatched and adult larva; 
the length is 4 mm. As the larvae eat so many Aphidae 
that it is impossible to find enough for them, they get a 
species of Coccidae living on the leaves of Citrus, and they 
covered themselves wholly with the white wax-secretions. 
They now rapidly become fullgrown and have the form 
and pattern of fig. 21, differing from the freshly emerged 
Fig. 21. larva by the much shorter antennae, 
darker head and broader body, 
which is much enlarged in the 
middle. The ground colour is now 
yellowish grey with pale yellow 
borders; the length is about 7 mm, 
The pygidium, which has become 
shorter and broader, is used for the 
following purpose. When they run 
on a smooth surface (leaves, glass 
etc.) they held themselves with it 
by excretion of a sticky fluid at its 
tip. This is very clearly to ob- 
serve when they run on a glass- 
plate. When irritated they also 
Chrysopa jacobsoni, n. sp. excrete a drop of it. Probably it 
Hage stof is secreted by the same glands, 
which form the spunyarn for the cocoon. The liquid is 
yellowish, somewhat sticky and draughts threads. It is 
never used to attach objects on the back, as I convinced 
myself repeatedly. 
On October 21st three larvae made cocoons which are sphae- 
rical, white, and covered with different objects from their 
back, mostly the wax-secretions of the Coccidae above men- 
tioned. The lid by which they open it when the imago 
emerges, is very loosely spun by the larva at 3 sides, 
Notes from the Ieyden Museum, Vol. XX XI. 
