SPAN-WORMS. 193 
The caterpillar is found very abundantly and often in 
destructive numbers on the currant; it feeds also on the 
plum and other plants. When full grown it is about two 
inches long; when at rest it is usually found clinging to a 
branch or leaf by its hind-legs, the body being extended 
straight out, so that it is easily mistaken for the stem of a 
leaf. It is pale-green, with an interrupted darker green line 
down the back, and indistinct broken transverse lines of the 
same color, and a yellow cross line on the posterior end of 
each segment. There are two small tubercles on the seg- 
ment immediately behind the head; the body is dotted with 
very small whitish tubercles and a few short black hairs. 
In some cases there is a small brown tubercle on each side 
behind the middle, and a purplish brown ridge on the last 
segment. As soon as full grown the caterpillar enters the 
ground for pupation, which is performed in a smooth cell; 
the pupa is dark brown. A closely related European species 
(Amphidasis betularia)is shown in Fig. 192; the illustration 
shows the caterpillars in two characteristic positions. 
THE LIME-TREE WINTER-MOTH. 
(Hybernia tiliaria Harris). 
The caterpillars of this moth feed chiefly upon the bass- 
wood, elm, hickory and others, but are also found in some 
numbers on the apple. In some years the moths, at least 
the males, are very common, and being attracted to the 
light are often found in large numbers on the street-lamps. 
They are most numerous late in the autumn, after all the 
foliage has been kiiled by frost. It is only the male that can 
fly, the female being a wingless, spider-like creature, with 
slender and thread-like antenne, a yellowish-white body, 
sprinkled on the sides with black dots and with two black 
spots at the top of each ring except the last, which has but 
one. The head is black in front, and the legs are ringed 
