Cossonidce of Japan. 37 
Genus 13. Hexarthrum. 
Wollaston, Ann. Nat. Hist. v. 448 (1860). 
Corpus breviter cylindricum, postice obtuse termiua- 
tum, (nisi oculo fortissime armato) calvum, vix nitidius- 
culum, profunde sculpturatum ; rostro brevi, angustulo- 
subtriangulari ; scrohe fere versus medium oculi ascen- 
dente ; oculis rotundatis sed valde demissis : prothorace 
ovato basi truncato : scutello valde distincto : metasterno 
baud valde elongate : elytris parallelis, et (oculo fortissime 
armato) minutissime parcissimeque asperatis. AntenncB 
brevissim^e, glabrae, circa (aut vix pone) medium rostri 
insert£e ; scapo brevissimo ; funiculo 6-articulato, art.° 1""* 
lato (reliquis multo majore), antice recte truncato, sequen- 
tibus brevibus, latitudine paulo crescentibus, inter se arete 
adpressis; capitulo abrupto, compresso, subrotundato, 
soHdo. Pedes breves, anteriores fere contigui, et etiam 
postici baud late distantes : femorihus (pr^esertim anticis) 
incrassatis, muticis : tibiis ad apicem externum in uncum 
acutum minus curvatum productis: tarsis longiusculis, 
gracilibus, filiformibus, art.° 1"" longiusculo, 3"° simplici 
(nee dilatato, nee bilobo). 
The genus Hexarthrum (which, in the size and fades 
of its exponents, has much the prima facie aspect of 
Rhyncolus) is at once remarkable amongst the Cossonides 
for its 6-articulated funiculus, its extremely abbreviated 
antennffi, and its rather shortly-cylindric outline, — the 
elytra (which are very minutely and remotely asperated, 
when viewed beneath a high magnifying power) being 
obtusely rounded behind. It is also further distinguished 
by its shortened rostrum and legs, by its first funiculus- 
joint being wide, and very straightly lopped-ofF (or trun- 
cated) in fi-ont, by its club being rounded, compressed, 
and exceedingly solid, by its four anterior cox^ being 
very nearly contiguous, by its femora (particularly the 
front pair) being a good deal thickened, and by its tarsi 
(the basal joint of which is appreciably elongated, and the 
third one simple) being slender and filiform. The only 
species of it which had hitherto been made known occurs 
at Madeira, — where I have met with it (though very 
rarely) crawhng on the inner walls of houses (where I 
have little doubt that it fed upon the old planks and 
rafters), and where the late Mr. Bewicke formerly cap- 
tured several examples of it amongst decayed, tinder-like 
