JVatcr Beetles of Japan. (S5 
from Pcnang ; in it the punctuation of tliorax and elytra 
is mucli denser. 
45. Cercyon dux, n. sp. Ovalis, leviter convexus, 
minus nitidus, niger, antcnnis, pedibus, palpisque piceo- 
rufis, prothorace lateribus castancis, clytris colore variabili- 
bus ; dense punctatus ; elytris striatis, striis postice pro- 
fundioribus. Long. 1| — 2 lin. 
This fine species is allied to C. Uttoralis, but has the 
anterior tibia3 simple at the extremity : it is remarkable 
for the dense and even punctuation of the elytra ; these are 
either of a chestnut colour, or black, with the margins 
paler; the strice are very deeply impressed towards the 
apex. The mesosternum has the intercoxal process very 
long ; the presternum is carinate along the middle, and 
the basal segment of the abdomen is finely carinate ; the 
whole of the under surface is pubescent and opaque, ex- 
cept the pentagonal portion of the metasternum and the 
mesosternal process ; these are shining, and distinctly and 
rather closely punctured. This and the following species 
evidently belong to the genus Pelosoma of Midsant, Avliich 
will, perhaps, ultimately have to be adopted as a good 
genus. 
Seaweed. Nagasaki and Amakusa. 
46. Cercyon algarum, n. sp. Ovalis, leviter convexus, 
nitidus, niger, antcnnis, palpis, pedibusque rufis ; capite 
prothoraceque sat crebre punctulatis, elytris striatis, striis 
apicem versus profundioribus, intestitiis parce subtiliter 
punctidatis. Long. 1 lin. 
Allied to C. littoralis, but with the anterior tibiae simple 
at the apex, the punctuation of the interstices of the elytra 
finer and more scanty ; the strias are very deeply impressed 
towards the extremity. The structure of the under svirface 
is similar to that of C. dux, the pentagonal space very finely 
and S]:)aringly punctured. 
Of fom* specimens I have seen, three have the elytra black, 
with only their very extremities paler ; in the other speci- 
men the colour of the elytra is pitchy; the species is probably 
vei-y variable in colour, like its allies ; the legs are furnished 
with fine short spines. 
Under seaweed in company with C. dux. 
47. Cercyon a'ptus, n. sp. Ovalis, leviter convexus, 
nitidus, colore variabilis, antennis, palpis, pedibusque testa- 
TRANS. ENT. SOC. 1873. — PART I. (maR.) F 
