COLEOPTERA. 
541 
in tight cases, so that these pests cannot gain access to them. 
Specimens should not be left exposed except when in use. 
And the entire collection should be carefully examined at 
least once a month. The injury is done by the larvae, 
which are small, plump, hairy grubs. Their presence is in¬ 
dicated by a fine dust that falls on to the bottom of 
the case from the infested specimens. These larvae 
can be destroyed by pouring a small quantity of car¬ 
bon bisulphide into the case, and keeping it tightly 
closed for a day or two. Benzine poured on a bit of cotton 
in the box will cause the pests to leave the specimens, when 
they may be taken from the box and destroyed. But we 
have found carbon bisulphide the better agent for the de¬ 
struction of these pests. 
The Raspberry Fruit-worm, By turns unicolor (By-tu'rus 
u-ni-co'lor).—The fruit of the red raspberry is often infested 
by a small white worm, which clings to the inside of the 
berry after it is picked. This is the larva of an oval, pale, 
dull yellow beetle, which is densely clothed with 
short, fine, gray hairs. The beetle is represented 
enlarged in Figure 649; it measures about three 
twentieths of an inch in length. This insect is also 
injurious in the adult state, as it feeds on the bios- FlG,649 ‘ 
soms of the raspberry. 
The family HlSTERlD^E (His-ter'i-dae) includes certain 
easily recognized beetles which are found about carrion and 
other decomposing substances. They are mostly small, 
short, rounded, or somewhat square-shaped beetles, of a 
shining black color, with the-wing covers marked by lines 
of fine punctures and truncate behind, leaving tw r o 
segments of the abdomen exposed (Fig. 650). In 
some species the wing-covers are marked with red. 
Fig. 650. The family NlTlDULlD/E (Nit-i-du'li-dae) com¬ 
prises small, somewhat flattened beetles. With many spe¬ 
cies the prothorax has wide, thin margins, and the wing- 
covers are more or less truncate, so as to leave the tip of the 
