The Larve of the Furniture Beetles. DN 
The Labrum.—tThis is slightly stouter than the clypeus. Near its posterior 
border two papillee occur, one on each side of the median line. These are the 
points of attachment of the labral hooks, which serve for the attachment of 
the muscles controlling the movement of the labrum. One observes their 
function when in dissection the removal of the muscles causes the labrum to 
move with them. The anterior and lateral borders of the labrum are fringed 
with stout, short bristles. Similar bristles also occur on either side of the 
median line diverging anteriorly in a V-shaped arrangement. 
The Mandibles in A. domesticum are stout and triangular. Their inner or 
Fig.5. 
Maxille and labium of A. domesticwm. 
biting margin bears three teeth of which the first or apical is the largest. 
The mandibles move laterally. They are controlled by two sets of powerful 
muscles—the abductor pulling them apart, the adductor closing them. The 
mandibles articulate by two condyles—a ventral articulating in a pit in the 
hypostome, and a dorsal articulating in the epistome. They vary in size 
according to the species—those of Hrnobius mollis and Xestobiwm tesselatum 
being larger. 
The Maxille.—The first pair of mazille consists each of a cardo, stipes 
and Jacinial lobe. There is no distinct galea discernible (Fig. 5). The cardo 
(c) is a small more or less triangular piece free of bristles. The stzpes (s) is 
a long narrow piece bearing a three-jointed telescopic palp. The lacinial 
lobe (l) is somewhat rounded and densely clothed with bristles. In Péilinus 
