Mr. Westwood on the Affinities of Clinidium. 219 
the head, thorax, and elytra respectively being oblong-quadrate in Cii- 
nidium, while in Rhysodes they are oblong-ovate. The sculpturing of 
the thorax is also distinct in the two genera, the lateral channels in 
Clinidium occupying only the basal angles, whilst in my specimen of 
Rhysodes they run parallel with the entire lateral margin. Dalman, 
however, describes these “ Sulci laterales’’ of Rhysodes as being ‘ basi 
“© dilatati latissimi, antrorsum angustati, ultra thoracis medium in puncta 
‘ impressa desinentes,”’ although in my specimen they are of the entire 
length of the thorax, as represented in my figure. The striation of the 
elytra is also distinct, there being in each elytron of Rhysodes, “ Strie 
** octo impresse, regulariter et profundé punctate, suturales ad apicem 
‘* usque continue, intermediz ante apicem a ruga obliqua ? cum striolé 
‘* punctata interrupte; interstitia angusta convexa levissima impunctata;’” 
whilst in Clinidiwm the elytra are described by Mr. Kirby as being ‘pro- 
“* funde sulcata vel porcata, porcis sex elevatis ; intermediis abbreviatis, 
** duabus longioribus apice connatis; apex ipse et basis coleoptrorum 
“* apud suturam in foveam magnam et profundam excavati.”” And last, 
but not least, Clinidium is apterous, and Rhysodes furnished with folded 
wings. 
Having thus, I trust, satisfactorily established the intimate connexion 
of these two genera, I now proceed to trace their joint affinities and ana- 
logies ; and in order to do this satisfactorily, I shall, in the first place, 
state the opinions of Dalman, Latreille, and Kirby upon the subject. 
With regard to Rhysodes, the original location appears to have been: 
amongst the Terediles, being placed by Dejean, in his Catalogue des Co- 
léoptéres, p. 40, between Oupes and Ptilinus. Dalman, however, in 
the Analecta Entomologica, disproves this location, observing, ‘ Certe 
“ peculiare genus, nec facile in ulla familia not& pentamerorum ponen- 
‘dum. Insectum primo intuitu habitum fere profert Colydii vel Lycti, 
“* sed tarsorum numerus et antennarum forma nimis distant.” Latreille, 
in the Familles Naturelles, p. 354, in again placing this genus with Cu- 
pes amongst the Ptinide, observes, in corroboration of Dalman’s re- 
marks, “ Ce dernier genre (Rhysodes), quoique pentamére, semble appar- 
“ tenir plus naturellement a la famille des Xylophages ou a celle des 
** Platysomes,”” (Cucujide); and yet the same author, in the second edi- 
tion of the Régne Animal, Vol. IV., p. 487, still retains it in the same 
