HICKORY CATERPILLARS. 
311 
caterpillar ; hence I am inclined to regard the following species de- 
scribed by Mr. Grote as synonyms of the species described by myself 
in the Annals of the Lyceum of Natural History, New York, in 1873. 
It should also be said that the moths raised from the Carya were shown 
to Prof. O. H. Fernald, who identified them as Phycis rubrifasciella 
Pack. Grote's description of A, demotella applies to my specimen ; so 
also does that of A. angusella. 
After preparing the foregoing account I found among my notes the 
following extract from an Illinois paper by an excellent observer, which 
I reproduce, as it shows that this insect is wide-spread in its distribu- 
tion, and works in the same manner East and West. 
In the latter part of May, while visiting a relative who lives in the western part 
of this county, I saw that many small webs had been spun by some insect around 
the footstalks of the leaves which grew near the terminal end of the branches of 
many hickory trees. These webs were always spun on the lower branches, seldom 
being more than 8 or 10 feet from the ground, and were confined to the second- 
growth trees. Upon examining these webs more closely there was found a short 
silken tube, closed at the outer end and opening at the other into a burrow, which in 
many instances extended through the wood of the present year's growth, but never 
passing into the old wood. Many of these burrows contained an ashen green sixteen- 
footed larva, measuring about half an inch in length ; the spiracles were ringed 
with dark brown, and there was a raised brown dot above each, and a pale brown 
<iot on either side of the second segment ; the head was pale brown. These larvaB 
changed to chrysalides in the forepart of June, and produced moths in the latter 
part of the same month. Although these larvas live in closed burrows, they are fre- 
quently infested with internal parasites; from a small number which I collected I 
obtained three moths and two parasites known to science as Phanerotoma tibialis 
Haldeman. A small flattened green spider also preys upon them, as one was observed 
near the mouth of a burrow with one of the larvae in its jaws. 
As these borers always spin a web around the leafstalks which grow around the 
mouth of their burrows, their presence can easily be detected, and then by means of 
a step-ladder the infested twigs may be cut off close to the old wood, collected in a 
basket, and afterwards be burned. 
McHenry Cofnty, III., July, 1882. 
D. W. COQUILLETT. 
72. The walnut case-bearer. 
Acrobasis juglandis Le Baron. 
Order Lepidoptera; family Ptra- 
Drawing two leaflets together and 
constructing a black case, a small dark 
greenish worm, changing to a gray 
narrow-winged small moth. (Riley, 
IV, p. 42.) 
We have observed at Provi- 
dence, June 1, between- the 
leaves of Carya porcina, a sim- 
ilar case, but in the form of a 
long, slender black cone, rather than spindle shaped. 
Fig. 120. — Walnut case-bearer ; a, larva between two 
leaves ; 6, case ; c, d, e, variations in tbe wings. 
(After Riley.) 
