64 Mr. David Sharp on the 
species from China. The i-elationship of the genus to 
Cyclonotum is evident. 
43. Hydrochus japonicus, n. sp. Supra viridi-metalli- 
cus, palpis piceis ; subtus niger, pedibus testaceis, femorum 
basi piceis ; thorace foveolato, elj'tris interstitiis minus 
evidenter elevatis. Long. 1-^ — l^lin. 
Smaller than either of our European species, somewhat 
similar in colour to H. angiistatus ; distinguished bj the 
prothoracic fovese, which appear separated from one 
another, as it were, by raised lines. Head and thorax 
metallic green or blue, the latter with five or six fovese, 
occupying the greater part of its upper siu'face, placed 
very close to one another, so as to appear separated only 
by narrow linear elevations ; the elytra are metallic, but 
not so brilliant in colour as the head and thorax ; they are 
coarsely, closely, and regularly punctate-striate, the third 
and fifth interstices elevated, but not strongly ; the fifth 
also elevated at the base ; the under surface is silky, 
opaque, and blackish ; the legs are yellow, the femora 
rather darker, especially at the base. 
Common at Nagasaki. 
44. Cyclonotum latum, n. sp. Sat convexum, nitidum, 
nigrum, palpis, antennis, tarsisque rufis, pedibus piceis ; 
subtiliter sat crebre punctatus : elytris evidenter striato- 
punctatis. Long. 3^ lin. ; lat. 2 lin. 
The broad, comparatively short fonn of this species is 
remarkable. The head is closely and rather finely punc- 
tured, especially in fr-ont; the thorax is finely and not 
densely punctured ; it is fully three times as broad as 
long. The punctuation of the el}i;ra is similar to that of 
the thorax, perhaps scai'cely so close or distinct. Each is 
also furnished with ten distinct rows of punctures ; these 
are coarser and more distinctly impressed at the extremity 
than at the base. The under surface is densely and finely 
punctured, pubescent, and opaque, except the central part 
of the metasternum ; the prosternum is very acutely ele- 
vated in the middle in front. The legs are pitchy, the 
tarsi reddish. 
I have seen but two specimens of this species taken at 
Nagasaki, where Mr. Lewis tells me it is common in 
ponds. 
I possess an allied species, Avith punctate-striate elytra. 
