208 
[Fel 
the other three species of Macrodorcas I am at present unacquaii 
but m the British Museum collection there is a small variet 
M. mponensis, having simple maudibles, which so nearly agrees 
M.rugipennis (Mots.) as to make it probable that that species iso. 
variety of M. rectus, described immediately before it. 
Maceodoecas opacfs, sp. nov. 
S,M. parallelus, depressus, opacus, nigro-fuscus ; capite transv 
deplanato, supra suMUssime granulosa, pone oculos punctis interspe 
anUce fere recto-truncato, angulis anticis olligue truncatis, later 
parallehs; mandihulis tenmbus, suh-arcuatis, medio intus dente ol 
armahs; Horace capite latiore, transverso, supra suUilissime granu, 
punchsparvisinterspersis, suturd Uviore pares punctata; scutelh 
opaco, punctata; elytris elongatis, parallelis, apice retundatis, opacis 
crebre at leniter punctulatis, suturd sub elevatd, nitidd, parce punctula 
tibits ant^cis b-denticulatis, medvis uni-spinosis, pasticis inarmatis ■ ta 
cihatis; mesosterno parce fiavo-pubescenti, suturd nitidd, leniter' can 
culatd, lateribus reticulato-punctatis ; abdamine sat crebre punctul 
suturd Icdviore. 
Lang. carp. (mand. excl.) 9i Zw. f20 mill.) 
Lang, mandib. 2 lin. (^ mUl). Habitat, N. Japan (Hakodac 
In Mas. Brit. 
This species resembles a very small Macrodorcas niponensis ; \ 
the head is not contracted behind, so that the sides are almost paraU 
The thorax is proportionately less broad. The elytra are almost of 
equal breadth, from the base to the posterior two-thirds, and are th 
evenly rounded; whilst in «e>ne;we> the elytra are slightly narrow 
at the base, broadest in the middle, and then gradually contracted 
the apex; the humeral angles are slightly produced; in niponensis t 
elytra are thickly and finely rugulose-punctate, the interstices beii 
shining; in abacus the elytra are dull, being somewhat thickly ai 
delicately punctured. The abdomen is distinctly punctured, somewh; 
thickly so towards the margins, where it is dull; whilst in niponensis 
IS sparmgly punctured, the sutural portions of the second, third an 
fourth segments being scarcely punctured at all. The meso-sternum 
longitudinally concave. The metasternum in opacus is gently b. 
distinctly canaliculate, especially posteriorly. 
The female is at present unknown. 
British Museum : Decemher 21st, 1869. 
