THE MALACODEKMATA. 
189 
unstrung the weak nerves of many an invalid. The 
wood-dust ejected from their burrows in beams, 
chairs, &c., may frequently be seen in country houses. 
They retract the limbs and simulate death very readily 
and pertinaciously. 
The members of these two and the four preceding 
families are associated by Thomson with Cerylon, Coly- 
dium, Myrmecoxenus, Sphindus, &c., in the Xylophagi 
of Latreille, which he places between the Lamelli- 
cornes and an equivalent division, Fungicola, Latr., 
immediately preceding the Sternoxi. 
The Fungicola are made to include genera of such 
different structure as Monotoma, Lathridius, Crypto- 
phagus, Telmatophilus, Tritoma, Triplax, Fndomychus, 
Tetratoma , Mycetophagus, Diphyllus , &c. 
