54 Mr. David Sharp on the 
and more rounded form, and the more distinctly spotted 
elytra, will prevent its being confounded with L. obscurus. 
Probably common at Kobe (Hiogo). 
23. Hyphydrus japonicus,n.s^. Rufo-testaceus, capite, 
prothorace, elytrisque nigro-variegatis. Long. 1^ — 2^ lin. 
Mas. — Nitidus fortiter punctatus. 
Femina. — a, opaca obsolete punctata. 
b, ut in marem nitida et punctata. 
This species is closely allied to H. varicc/atus. It is, 
however, rather smaller, proportionally a little broader, and 
more acuminate both in front and behind ; the black mark- 
ings are similar to those of H. variegatus, but leave a larger 
portion of the upper surface yellow. The punctuation is 
not so dense as in variegatus, and is more distinctly divided 
into large and small punctures. I am not aware that in 
variegatus a male-like form of the female has been obtained, 
but in japonicus the two appear to occur in about equal 
abundance. 
H. japonicus is variable in size, in the extent of the 
black markings of the head and thorax, and also in the 
sculpture of the upper surface, but none of the varieties I 
have seen could at all be vmited with variegatus. 
Common at Nagasaki and Hiogo. 
24. Hydroporus japonicus, n. sp. Ex affinitate //. 
minutlssimi. — Elongato-ovalis, subdepressus, supra rufo- 
testaceus, capite prothoraceque basi plus minusve infus- 
catis ; elytris distincte punctulatis, fasciis longitudinalibus 
plus minusve coalescentibus nigris ; subtus piceus. Long. 
I hn. 
This little insect belongs to the same section of the 
genus as minutissimus and its allies; it has a deep im- 
pressed mark on each side of the thorax, and this is con- 
tinued on the basal part of the el}i;ra. The antennas are 
pitchy, largely yellow at the base. The head is yellowish. 
The thorax is yellowish with the base clouded in the middle, 
and with the dark part sparingly but distinctly punctured ; 
the impressed lines are deep ; it is a little rounded at the 
sides, its outline not continuous with that of the elytra ; 
it is nearly as broad at the front angles as at the hind ones. 
The elytra are scarcely broader at their base than the 
thorax ; they are a little rounded at the sides and pointed 
behind ; they are of a yellowish colour, but much marked 
with black ; the suture, a transverse band at the base, an 
