14 Mr. T. Vernon Wollaston 07i the 
antice et postice tiimcato, mox pone apicem transversim 
constricto : scutello subrotundato, parvo sed conspicuo : 
metasterno valde elongate : elytris parallelis. AntenncB 
breviuscidffi, in medio (aut potins mox ante medium) 
rostri inserts ; scaj)o robusto, gradatim clavato ; funiculo 
5-articulato, art.° 1™° reliquis paulo majore, sequentibus 
brevibus suba?qualibus (tamen in P. Huitoni, britannico, 
2*^" sensim paulo elongato) ; cajntulo parvo, ovali. Pedes 
subrobusti, antici ad basin parum, intermedii paulo magis, 
et postici remote inter se distantes : femoribus muticis : 
tihiis ad apicem externum in uncum productis : tarsis 
art.'' imo^ 2'^o 3*'°que longltudine subrequalibus, 3"° vel (ut 
in specie nostra atque in P. Iluttoni) sensim latiore et 
paululum bilobo, vel (ut in P. cylindrico) fere simplici, 
ult.'"° clavato unguiculis parvis armato. 
Althoiigh Pentarthriim is not a new genus (it having 
been established by myself in 1854), I have nevertheless 
given a full diagnosis of it in order to point out the exact 
particidars in which it differs from the other groups of the 
CossonidcB with which we are here concerned ; and it will 
perhaps be sufficient therefore to remark that the compa- 
ratively narrow, parallel, and elongate bodies of the few 
species which have as yet been ascertained to compose it, 
in conjunction with their but very slightly shining, piceous 
and rather closely sculptured surfaces (which are entirely 
fi-ee from both scales and pubescence), their almost medially 
inserted antennne, their 5-jointed funiculi, and tlieir linear 
but somewhat robust rostra, will suffice to distinguish it 
fi'om its immediate allies. 
3. Pentarthrum angustissimum , n. sp. 
P. lineare, angustissimum, depressiusculum, subuitidum, 
clare piceum ; rostro lineari, punctulato, ocuhs rotundatis, 
prominulis; prothorace ovali, antice posticeque truncato, 
mox pone apicem profunde transversim constricto, paulo 
grossius pimctato, postice in medio late sed leviter depresso ; 
elytris prothorace paulo angustioribus, ])arallelis, profunde 
et confertim sulcato-punctatis, interstitiis sensim elevatis ; 
antennis pedibusque breviusculis, rufcscentioribus, illarum 
capitulo parvo, fcrrugiueo. Subtus profunde et ai-gute 
punctatiun. 
Long. Corp. liu. 1 ^ — 1^. 
Copt urn prope Nagasaki, in ins. Kushiu, cu'ca domos, 
Junio hand infrequens. 
