TUB LONOICOBNIA. 
193 
mandibles, minute retractile antennas, and rudimentary 
tubercular eyes on each side. They possess six very 
small, jointed, horny legs in front ; but thrust them- 
selves along their galleries by means of fleshy dorsal 
elevations, the segments being all more or less 
retractile. 
Our species, very few in number compared with 
those of most other countries, may be considered as 
divided into four fnmilies : — the Prionidse, Ceramby- 
cidte, Lepturidie, and Lamiidse ; the three last of which 
are again separated into sub-families or tribes; by 
some authors the Ceram bycidx and Lepturidx are 
classed together under one family, Cerambycidse. 
The Prionidj; have the labrum obsolete or very 
small ; the mandibles large and robust, especially in 
the males ; the inner lobe of the maxillae obsolete or 
small ; the palpi moderately long ; the labium small ; 
the antennae inserted close above the base of the 
mandibles, but with the insertion not surrounded by 
the emargination of the eyes ; the head not narrowed 
behind iuto a neck ; the thorax subquadrate, spined or 
toothed at the sides ; the prosternum considerably 
produced in a blunt process behind the anterior coxae ; 
the elytra spined at the apex ; and the anterior coxie 
transverse and wide apart. 
We possess but one genus and species, Prionus 
cor iar Lus, the largest of the section in England. This 
insect is by no means common, occurring very rarely 
near London, though sometimes taken more frequently 
in woods near the south coast. It is a very large, 
dull brown, flat, clumsily-built creature, having broad, 
serrated antennae, prominent mandibles, strong spines 
to the sides of its thorax, and wide tarsi ; it rests ou 
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