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VIII. Ona new genus and species of Coleoptera belong- 
ing to the family Lucanide, from the Sandwich 
Islands. By CHas. O. WatEeRHOUSE. 
[Read 20th March, 1871.} 
Amone some insects lately sent to the British Museum 
from Honolulu, Sandwich Islands, by Mr. Harper Pease, 
were two specimens of a small, dull-black coleopterous 
insect belonging to the family Lucanide which was new 
to the collection, and is apparently new to science. 
The species is interesting not only from its somewhat 
peculiar form, but from the isolated locality from which 
it comes ; Honolulu being 2081 miles from the nearest 
continent, that is, from San Francisco in California. 
The insect is, however, evidently most closely allied to 
Sclerostomus Bacchus, which comes from Chili, distant 
from Honolulu 5902 miles. 
Its short broad form, and much rounded elytra, together 
with the extreme brevity of the metasternum, and the 
absence of spines from all the tibiz, except the interme- 
diate pair in the male, will at once separate it from all 
the Lucanide hitherto known. 
I propose to call it Apterocyclus. 
APTEROCYCLUS, gen. nov. 
Mandibles in both sexes short, very slightly curved, 
furnished with a single tooth on the inner-side close to 
the base; clypeus very wide, with the front margin very 
nearly straight ; mentum semicircular; second and third 
joints of the antennz subquadrate, of nearly equal size, 
the fourth to seventh jomts gradually becoming shorter, 
the three apical joints spongy, and forming a slight club ; 
eyes in part divided by the canthus; all the tibize unarmed, 
except the intermediate pair in the male, which are fur- 
nished with a single minute submedial tooth; metaster- 
num extremely short. 
Apterocyclus Honoluluensis, sp. nov. 
Brevis, subdepressus, ater; capite lato, antice truncato ; 
mandibulis parvis, unidentatis, punctatis; thorace capite 
TRANS. ENT. soc. 1871.—PaRT 11. (MAY.) 
