Mr. C. J. Galian on new Longicorn Coleoptera . 461 
what bifid, the two posterior more acute ; with, in addition, a 
feeble median cariniform elevation placed just before the 
posterior transverse depression. Elytra exhibiting delicate, 
silvery-grey, irregular fascise, which change their position 
according to the light in which they are viewed. The 
granules with which the elytra are furnished are wide apart, 
arranged in three rows on the disk of each and more irregu- 
larly on the sides. The second ventral and the terminal 
dorsal segment of the abdomen fringed with tawny-red hairs. 
Arrhythmus punctatus, sp. n. 
Fuscus : capite supra prothoraceque sat sparsitn punctatis et sub- 
tiliter griseo-pubescentibus : disco prothoracis paullo ante medium 
acute bituberculato ; elytris nitidis, flavescentibus, sat sparsim 
fortiterque punctatis, punctis, plagis duabus basalibus, maculis 
duabus parvis ad medium et apice fuscis; pedibus flavis, clavis 
femorum fuscis ; antennis corporo duplo fere sequalibus, flavis, 
articulis primo et secundo cum apicibus ceterorum infuscatis. <$ . 
Long. 10-20 mm. 
Hab . Imerina Mountains. 
Prothorax gradually and slightly narrowed from the base 
to the apex, with two distinct and rather sharp tubercles on 
the anterior part of the disk. Elytra strongly and somewhat 
sparsely punctured, yellowish, with a plaga on each side at 
the base, a small spot on each at the middle, the apex, and all 
the punctures dark brown ; the elytra are scarcely constricted 
before the apex, the latter therefore does not appear to be 
expanded ; the apices of each are subacuminately rounded 
and produced near the suture into a short blunt spine. The 
body underneath is covered with a greyish pubescence ; the 
underside of the prothorax is somewhat transversely rugose, 
and the sides of the metasternum are sparsely and strongly 
punctured. The antennae are about twice as long as the 
body, yellowish, with the first two joints and the apices of 
the others brownish ; the scape is rather narrow at the base, 
gradually thickened up to the apex, and rather thickly but 
not rugosely punctured. 
From A . rugosipennis , Waterh., and A . pallimembrisy 
Fairm., this species may be distinguished easily by the shape 
of the prothorax and by the nature of the punctuation, as 
well as by other minor characters. Of the two specimens 
that I have seen one is very much larger than the other. It 
is probable that varieties may occur in which the dark brown 
of the elytra occupies a much larger extent. 
