296 
Garden Work 
black and white, and are found on the under surface of 
leaves. 
The Ichneumon Flies. — These are very great friends 
of the gardener, and should be protected. The female has 
a sharp ovipositor with which she pierces the body of the 
caterpillar, and then 
lays her eggs in the 
hole. In a short 
time the eggs hatch, 
and the little white 
grubs which are pro- 
duced feed on the 
fatty tissue of the 
caterpillar, and by 
the time the grubs 
have grown to their 
full size the cater- 
pillar is destroyed. 
Thus we see how r 
curiously these little 
flies assist the gar- 
dener in his work 
Caterpillar devoured by Larva of Ichneumons of keeping down in- 
jurious insects. The 
Ichneumon Flies have generally a long, thin body, with 
an ovipositor of varying length. The larvae are small 
white grubs, but from their position of security are seldom 
seen. The pupae may often be seen in numbers in small 
yellow cocoons hanging from the skin of the caterpillar 
they have destroyed. 
The Glowworm, in the larval stage, feeds on snails, 
