THE ORANGE TIP 
3i7 
Cuckoo Flower ( Cardamines pratensis), Hedge Mustard {Sis- 
ymbrium officinale ), Yellow Rocket (Barbarea vulgaris) and 
Garden Honesty ( Lunaria biennis). Also Horseradish ( Coch - 
learia armeracia) and Watercress {Nasturtium officinale) are 
often selected for the purpose. The seed vessels of these 
plants constitute the chief food of the larvae, but the latter 
will also feed upon the buds, flowers and leaves. The larvae 
always rest lying along 
the seed vessels in a 
straight attitude, and 
so closely resemble 
them in both form and 
colouring that they 
are rendered almost in¬ 
visible. 
Egg. The egg is 
1*21 mm. high and is 
of an elongated pyri¬ 
form shape. It has 
about eighteen longi¬ 
tudinal keels; of these 
twelve run the entire 
length, the remaining, 
six commence a little 
below the summit and 
run to the base; the 
spaces between the 
keels have each about 
forty transverse ribs. 
When first laid, the egg 
is pale greenish-yellow- 
ish-white, which gradu¬ 
ally deepens into yellow at the base, blending into orange 
at the middle, afterwards becoming wholly orange colour ; 
and, finally, before hatching, it changes to pale ochreous- 
brown. 
The eggs are laid singly, standing erect and are usually 
placed on the base of the calyx, or on the stalk close to it. 
The egg stage lasts about a week. 
Larva. By the. time the egg hatches, the young, tender 
The Orange Tip at rest on Garlic Mustard, 
one egg on the flower stem. Sketched from life. 
