136 
BRITISH BEETLES. 
lobe, terminated by two diverging bristles. The 
tibiae are unspined on the outer side, but have a 
more or less hooked spur at the apex of the anterior 
pair. Nemosoma elongata, a linear narrow species 
(with ten joints to the antennae), very rare in Eng- 
land, is found on the Continent, under bark, with 
Hylesinus varius and vittatus ; which, with their 
larvae, it appears to destroy. Tenebrioides (Trnr/o- 
sita) mauritanica, a flat, black insect, has evidently 
been imported in merchandise; and Thymalus limba- 
tus, almost a C as si da in shape, found under bark in 
the New Forest, has a horny hook at the apex of its 
maxillae, and all its tibiae armed at the tip with very 
small simple spines. 
The Monotomid;e have by many authors been 
regarded as belonging to the Colydiidae, Cucujidae, 
or Lathridiidae ; in the formation of the antennae, 
however, as well as in other characters, they present 
considerable points of difference from either of these 
families ; the antennae are inserted under the sides 
of the front; they are stout and apparently ten- 
jointed, the last joint being obsoletely two-jointed, 
and forming a club; the head is large, and the man- 
dibles short and robust, and the anterior coxal cavities 
are broadly closed behind ; the tarsi are three- 
jointed; the species are elongate, more or less de- 
pressed, usually dull and rough-looking, with the 
thorax crenulate at the sides, and the elytra not 
covering the pygidium ; they are mostly gregarious, 
and especially abound at the wet bottoms of hay- 
stacks, and in hot-beds and grass-heaps ; two species 
occur in ants’ nests. 
The Lathridiid.-u have clavate antenme inserted a 
