94 DR. HARRIS’S REPORT. April, 
bark, the larve bury themselves beneath it before winter, and in’the 
spring attack the solid wood, which they perforate deeply in various 
ways, but most usually in the direction of the fibres. The places of 
their operations are known by the oozing of the sap intermixed with 
the castings of wood, which are every now and then thrust back- 
wards by the insects out of the external apertures. According to 
the observations of Gen. Dearborn, who has given an excellent ac- 
count of this insect, the larve attain their full size by the 20th July, 
soon become pup, and appear in the perfect state early in Septem- 
ber. ‘Thus the existence of this species is limited to one year. 
White-washing, and covering the trunks of the trees with grafting 
composition, may prevent the female from depositing her eggs on 
them ; but this practice cannot be employed to any extent. Perhaps 
it will be useful to head down young trees to the ground, with the 
view of destroying the larve contained in them, as well as to promote 
amore vigorous growth. In nurseries and plantations, much evil 
might be prevented, by employing children to collect the perfect in- 
sects while in the act of providing for the continuation of their spe- 
cies. A common black bottle, containing a little water, would be a 
suitable receptacle for them, and should be emptied into the fire in 
order effectually to destroy the insects. The gathering should be 
commenced as soon as the insects first appear, should be continued 
daily as long as any are found on the trees, and furthermore should 
be made a general business for several years in succession. I have 
no doubt, should this be done, that, by devoting one hour every day 
to this object, we may in time rid ourselves of this noxious insect. 
The genus Callidium is nearly allied to that of Clytus. The 
head nods forwards ; the body is flattened ; the antenne are propor- 
tionally longer than in Clytus ; the thorax is orbicular, not convex 
above, and is depressed or indented on the disc, and the thighs are 
much more swelled in the middle. Ihave never found any species 
upon flowers, though they are not uncommon in the day-time upon 
wooden buildings and fences. The larve do not differ much from 
other borers of this family ; they live in the trunks of trees, and in 
timber ; their passages are more or less tortuous, and are filled with 
castings of the wood as fast as the insects advance. The larva state 
is said to continue two years. 
