Rhagium.] LONGICORNIA. 231 
small, and are almost entire or very slightly emarginate ; the antenne 
are situated high on the forehead, and are almost contiguous at base ; 
the thorax is armed with a strong lateral spine; the anterior coxal 
cavities are narrowly closed behind; the elytra are rather strongly 
seulptured, and are furnished with more or less distinct raised lines ; 
down the centre of the abdomen, which is rather strongly pubescent, 
there runs a very distinet smooth and more or less elevated line. 
The larve of Rhkagiwm, and apparently of the majority of the members of the 
tribe, are of much more uniform breadth than those of the Cerambycina; the 
prothorax is very little broader than the posterior abdominal segments, and the whole 
insect is subparallel until a little before apex ; the upper surface is sparingly pubes- 
cent, and the antenne and legs are very short; they live under bark of various 
trees. 
Six species are found in Europe, of which three oceur in Britain ; 
their synonymy is somewhat confused, and in the catalogue of Heyden, 
Reitter, and Weise the name of our well-known species R. inguisitor is 
applied to R. zndagator ; as this would cause considerable confusion, I 
have adopted the old nomenclature, but have added the synonyms. 
I. Antenne very short; elytra rather strongly pubescent with- 
out distinct oblique yellowish bands. 
i. Head straight behind eyes ; raised lines on elytra ceasing 
considerably before base slay -o Sot ecw bes 
ii. Head narrowed behind eyes ; raised lines on elytra con- 
PimUedralliMOs GsLONOASe ae seerapie aR wes 
II. Antenne longer ; elytra feebly pubescent with two strongly 
marked oblique yellowish bands oneach. . . . . . . R. BIFASCIATUM, F. 
R. INQUISITOR, F. 
R. inpagator, Gyll, 
R. inquisitor, F'., Gyll. (mordax, De G., Thoms.). Oblong, black, 
clothed with ashy pubescence, elytra with two wavy testaceous bands 
on each about middle, enclosing glabrous black spots on exterior margin 
often meeting suture ; the general pubescence is more or less interrupted, 
and gives the insect a closely mottled appearance ; head nearly square 
with a smooth black space behind eyes, antenne very short ; thorax longer 
than broad, with lateral spines e:mparatively blunt, constricted in front 
and depressed behind ; elytra coarsely punctured, with raised lines, which 
cease considerably before base ; legs black, pubescent. L. 14-18 mm. 
In decaying ash, elm, oak, fir and other trees; common and generally distributed 
throughout the greater part of the kingdom ; local in Scotland. Ireland, common in 
old woods in Tyrone, Kerry, Sligo, Mayo, &e. 
In the Entomologist’s Monthly Magazine, vol. xviii. p. 18, I inserted 
the following note on this insect, which perhaps is worth reproducing :— 
“ Having noticed the strength of jaw of several beetles and other 
insects, I tried some experiments with a specimen of &. inguisitor. 
The beetle was held between the finger and thumb, and the weights used 
were wrapped in a sheet of paper tied round with a string of sufficient 
size to give the beetle a firm grip, and yet allow it to let go easily when 
it felt inclined. The greatest weight raised was 5 ounces, or 2187.5 
grains; the beetle weighed exactly 4 grains in a chemical balance, so 
