152 
ST. HELENA . 
member of the group which has hitherto been brought to light : and 
although equally brassy with several of the other species, its general 
aspect is somewhat more in accordance with the sub-family Cosso- 
mdes than is the case with its numerous (and more or less eccentric) 
allies.” 
*M. chevrolatii, Woll. ( Acanthomerus armatus, Boheman). — This 
line large species, a little less than one-third of an inch in length, is 
found only in the native cabbage-trees, especially Lachanodes leuca- 
dendron , on the high central land, and is somewhat rare. 
"M. comcollis, Woll. — A very glossy black Beetle, with a short, 
ovate, thick body, about one-tenth of an inch in length, very 
abundant amongst the indigenous cabbage-trees, and also in the 
rotten branches and stems of oak trees at the lower altitude of 
2000 feet above the sea. 
M. monilicornis, Woll. — A slightly more oblong species, but 
very much resembling the last. It is equally bright, black, and 
glossy, and more abundant amongst the indigenous cabbage-trees on 
the high land and the exotic plants at a lower altitude. 
Pentarthrum, Woll. 
. * P - subcaecum, Woll.— This little blind Beetle, Mr. Wollaston 
writes, possesses so unmistakable an affinity (in its five-jointed 
funiculus and the general contour of its narrow, subcylindrical, 
sculptured body) with the genus Pentarthrum (as known hitherto 
through the P. huttoni from the west of England and the P. 
cylindricum which was found by Mr. Bewicke at Ascension) that I 
cannot persuade myself that it should be separated therefrom, even 
whilst equally aware that its obsolete eyes and scutellum would of 
themselves, tend to affiliate it rather with the little group Mesowenus, 
of the Madeiran and Canarian archipelagos. Yet I feel so satisfied 
that it, has more in common with Pentarthrum than with Mesoxenus 
that I have preferred assigning it to the former, even should my 
doing so necessitate the diagnosis of that genus being so far widened 
as to embrace representatives in which (like the Mesoxeni) the eyes 
and scutellum are obsolete. Perhaps, in reality, however, it will be 
found desirable, in the end, to treat it as the type of a yet additional 
group, combining the external aspect of Pentarthrum with the 
escutellate sub-eyeless body of Mesoxenus; but as these little Cos- 
sonideous assemblages are already perhaps somewhat too numerous 
