86 General Notes. (January, 
generally in both directions (up and down), a varying number of 
straight tubes, parallel to the axis of the plant (see figs. 1, 2 and 3) 
They average five or six millimetres in length and commonly ter 
minate blindly, a mature beetle being usually found in the end of 
each. Sometimes, but rarely, one or more of these vertical exc | 
vations is found to extend farther and, bending at a right angle, to © 
take a turn around the circumference of the bush, thus constitut 
ing a second horizontal circular canal from which, as from the | 
primary one, a varying number of short vertical tubes branch off. — 
And in very exceptional cases these excavations extend ‘still 
deeper, and there may be three, or even four, more or less complete 
circular canals. Such an unusual state of things exists in the 
specimen from which figure 3 is taken. | 
It will be seen that with few exceptions, the most important of 
which is shown in figure 4, all the excavations (including both the 
horizontal canals and their vertical offshoots) are made in the sap- 
wood, immediately under the bark, and not in the hard and com 
paratively dry central portion. This i$ 
doubtless because the outer layers of the i 
wood are softer and more juicy ant 
therefore more easily cut, besides com — 
taining more nutriment and being, doubt- q 
less, better relished, than the dryer 1- 
terior. : 
Fi, 5.-Corthylus punctatissimus. sent of each vertical tube may be taket 
animal has been at work; and the number of these tubes gen 
ally tells how man 
individual makes but one ho 
