SPAN-WORMS. 187 
abdomem and very plumose antennae. Only a single brood 
is produced annually. The insect is shown in Fig. 186 and 
in Fig. 187, Plate XVI. 
The caterpillar, which feeds upon the hazel, blackberry, 
raspberry and other plants, is very handsome; 1t has a 
smooth and cylindrical body of uniform thickness, a little 
thicker over the first abdominal feet, and lacks any pro- 
tuberances whatever; it isof a pale straw-yellow color, with 
two subdorsal fine brown lines, and two smaller ones 
on the sides, interrupted by two large and conspicuous, 
angular, black dots, a pair on each segment. The head and 
prolegs are dotted with black. The caterpillar grows to 
about one inch and a half in length. When full grown it 
does not descend to the ground to pupate, but forms aslight 
but well formed web of thick vellow silken threads among 
the leaves. The pupa is bluish-white with a number of 
black spots. 
The moths deposit a large number of beautiful eggs; as 
many as 368 were laid by a single female, which explains 
the fact that this insect can soon become very numerous. 
THE COMMON CYMATOPHORA. 
(Cymatophora pampinaria Guen.). 
This is an exceedingly common moth, yet difheult to 
find, as itso thoroughly mimics the color and markings of 
the barks of trees upon which it rests that only well trained 
eyes can discover it. These moths vary greatly in color and 
markings but very little in size; they measure with expanded 
wings about one inchanda half across. The body and wings 
are pale ash, more or less clearly marked with three dark 
brown lines and numerous spots of the same color. Prof. 
Packard says: “that it may be known by the very distinct 
line at the base of the abdomen, the basal ring beyond being 
unusually white, and by the under side of the wings having 
