584 
finding a louse by extending the segments of their body, which 
enables them to nearly double their length, and to strike here and 
there until they 
find their prey. 
Some species of 
ladybirds are also 
important factors 
in the destruction 
of plant lice, both 
as adults and 
larve ; but as Lace-winged fly. Laced-winged fly, eggs, 
they consume the and larve. 
entire louse, they 
cannot compare with the larve of the Syrphus flies in the speedy 
disposal of aphis. A Syrphus fly larve will dispose of five to 
seven lice while the ladybird larve is consuming one. 
CABBAGE MorTHs. 
The larve of two kinds of moths are, says Mr. Lea, late Ento- 
mologist to the Department of Agriculture, very destructive to 
the cabbage and turnip. These are the cabbage or diamond-back 
moth (Plutella cruciferarum) and the stinking-head moth (Hver- 
gestis rimosalis). Plutella 
Cruciferum (Zell), —- The 
larve of this little moth 
(which is common all over 
the world) are very destruc- 
tive to the cabbage, cauli- 
flower, and turnip. The 
leaves have small holes eaten 
in them, and these holes are 
frequently so numerous that 
more than half the leaf is 
devoured ; with cabbages the 
inner leaves are seldom at- 
tacked, though larva may 
occasionally be seen in the 
A heart itself, the damage is 
f usually to the outer leaves ; 
ee 8 4 si) with cauliflowers every leaf 
Gs? ee is attacked and the crown is 
OG: oC mes § Sime frequently covered with ex- 
: ; crement and web, becomes 
Cabbage es ae pupa, moth of a brown colour, and is 
totally unfit for market ; 
hundreds of larve and pups may be seen on one plant. The 
larve is pale green in colour, and, on being touched, jerks itself 
