112 THE AUSTRALIAN NATURALIS'I, 
put a number, showing the various stages of develop- 
ment, into the killing bottle. After three hours I mounted 
and pinned out the “crickets, and was just about to place 
the eggs in a box when I saw one of the eggs moving, and 
was fortunate enough to see the baby cricket emerge from 
the egg. 
I observed the following with the aid of a lens. The 
skin was slit along the back and the tiny creature moved 
its head and thorax up and down, at each rising getting 
further out of the egg. The head and thorax came out, 
and later on the abdomen and the two tail appendages or 
cerci came next, and in this last effort it rolled the egg 
and itself right over. But the legs and mouth parts 
seemed to be connected with a fine piece of skin. For 
some time it moved about like a boy on a cross-bar, pei 
ing its body right back, and then swinging forward, 
would roll itself and the ege right over from one ‘ide 
to the other whilst making these swinging movements. 
The cerci were very distinct, and its legs were all 
bent up and connected with its mouth and parts under 
the head. The eyes shone like two pearls when seen in 
the light. At last one lee was free, and I then aided it 
by gently separating the other legs with a needle, for 
probably the exit was made more difficult because the 
earth pellet, to which the egg was attached, had broken 
away from the wall. 
LIST OF INSECTS ASSOCIATED WITH ACACIA 
DECURRENS. 
Noted in Mr. Ll. Gallard’s Prize Essay. 
The insects frequenting Acacia decurrens may be di- 
vided into three groups :— 
Ist. Internal workers, which as larvae bore in the 
wood. 
2nd. External feeders, which eat the bark and leaves. 
3rd. Suctorial insects, which suck the sap. 
A supplementary group is added, comprising para- 
sitic insects preying upon those included in the three 
above groups, and frequenting A. decurrens for this pur- | 
pose. : 
The following is a list of insects belonging to these 
groups, all of which have been personally collected by the 
author :— \ 
