- 9 - 
end of the body, as is well shown in the figure. They also differ 
from any of the preceding larvse in looping the body when they 
travel, like the so-called “ measuring worms” and “ inch worms.” 
The larva, when mature, unlike the preceding species, spins a slight 
silken cocoon [Fig. 7 b~\. At the end of ten days or two weeks it 
comes forth as a moth. These cocoons are found among the leaves 
near the base of the cabbage head, if the larvae are very abundant. 
There are from two to five broods of this insect in a year, the num¬ 
ber depending upon the length of the summer season. 
The food-plants of this insect, as given by Dr. Riley, are cab¬ 
bage, kale, turnip, tomato, mignonette, dandelion, dock, clover, and 
a few others. 
The remedies are the same as for Pieris rapse. 
THE CABBAGE PLUTELLA. 
(Plutella crucifer arum Zell.) 
This insect, in the mature stage, is also a moth, but a very 
small, narrow-winged one, that is liable to escape notice. It meas¬ 
ures hardly more than half of an inch from tip to tip of the fore 
wings when they are spread. The moth is shown with wings 
spread and closed at Fig. 8, / and h. The general color of the 
Fig. 8. 
wing is dark to light brown, and there is a wavy, white line along 
the posterior margin. When the wings are closed over the abdo¬ 
men the two white margins meet so as to make a conspicuous white 
dorsal stripe, which is continuous, with white upon the thorax and 
head. These markings are well shown at/ and h, Fig. 8. 
The winter is probably spent in the chrysalis stage, as the 
larvae appear upon early cabbages about as soon as they are set out 
in this locality. These larvae [Fig. 8 a ] are slender, green in color, 
and are very active when disturbed, wriggling themselves quickly 
off the leaves and dropping on a silken thread. 
When mature, the larvae form delicate white cocoons [Fig. 8 e] 
among the leaves, and in a few days appear as moths. These 
