Rhuyiuin] LONGICORMA. 231 



small, and are almost entire or very slightly emarginate ; the antennae 

 are situated high on the forehead, and are almost contiguous at base ; 

 tin- thorax is armed with a strong lateral spine; the anterior coxal 

 cavities are narrowly closed behind; the elytra are rather strongly 

 sculptured, and are furnished with more or less distinct raised lines; 

 down tin- centre of the abdomen, which is rather strongly pubescent, 

 there runs a very distinct smooth and more or less elevated line. 



The larvae of Rkigium, and apparently of the majority of the members of the 

 tribe, are of much more uniform breadth than those of the Cerambycina ; the 

 protborux is very little broader than the posterior abdominal segments, and the whole 

 insect is subparallel until a little before apes ; the upper surface is sparingly pubes- 

 cent, and the antennae and legs are very short ; they live under burk of various 

 tree?. 



Six species are found in Europe, of which three occur in Britain ; 

 their synonymy is somewhat confused, and in the catalogue of Heyden, 

 Reitter, and Weise the name of our well-known species K. inquisitor is 

 applied to R. indagator ; as this would cause considerable confusion, I 

 have adopted the old nomenclature, but have added the synonyms. 



I. Antenna very short ; elytra rather strongly pubescent with- 



out distinct oblique yellowish bands. 



i. Head straight behind eyes ; raised lines on elytra ceasing 



considerably before bise R. IKQCISITOB, F. 



ii. Head narrowed behind eyes ; raised lines on elytra con- 

 tinued almost to base R. IXDAGATOB, Gyll. 



II. Antennae longer ; elytra feebly pubescent with two strongly 



marked oblique yellowish bauds on each K. BIFASCIATUM, F. 



R. inquisitor, F., Gyll. (mordax, I)e G., Thorns.). 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, antennae very short ; thorax longer 

 than broad, with lateral spines c< mparatively blunt, constricted in front 

 ;ind depressed behind ; elytra coarsely punctured, with raised lines, which 

 considerably before base; legs black, pubescent. L. 14-18 mm. 



In decaying ash, elm, oak, tir and other trees; common and generally distributed 

 throughout the greater part of the kingdom ; local in Scotland. Ireland, common in 

 oM woods in Tyrone, Kerry, fc'lij.'o, MII.\O, &c. 



In the Entomologist's Monthly Magazine, vol. xviii. p. 18, 1 inserh-d 

 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 R. inquisitor. 

 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 

 fi/e to give the bei-tle a firm grip, and yet allow it to let go easily when 

 it l-lt inclined. The greatest weight raise. I was "> ounces, or 2187.5 

 -raius ; the beetle weighed exactly 4 grains in a chemical balance, so 



