Water Beetles of Japan. 55 
elongate mark, not united with the sutural one except near 
the base, a mark below the shoulder, and another one be- 
hind this near the outer margin, black; they are rather 
strongly punctured on the disc. The legs are yellow. The 
under surface is blackish, with the breast red in the middle. 
Abundant at Nagasaki. 
25. Cnemidotus intermedms. Latus, testaceus, indis- 
tincte nigro-maculatus, elytris fortiter striato-punctatis ; 
laminis coxarum fortiter punctatis, apice valde et acute 
dentatis. Long. 1| lin. 
Closely allied to C. ccesus and rotundatus, and in form 
intermediate between the two ; easily distinguished from 
either by the much more closely punctured ventral plates, 
and the large and very pointed tooth at their extremity. 
Thorax with a few punctures near the hind angles, some 
finer ones about the front, and an irregular roAv of larger 
ones along the base, this row terminating some distance 
from the sides by two or three larger punctures placed 
close together. Elytra yellow, with five or six indistinct 
black spots, punctate-striate, the punctuation very coarse 
at the base and fine at the extremity ; the punctures black, 
the first of each row very large and deeply impressed. 
Abundant at Nagasaki. 
26. Haliplus japonicus, n. sp. Rufo-ferrugineus, capite 
infiiscato, prothorace basi utrinque impresso, elytris fortiter 
striato-punctatis, fusco-lineatis. Long. 1^ lin. 
Allied to H. ruficollis and about the same size, but 
scarcely so broad at the shoulders ; the punctures of the stride 
of the elytra much larger, the first puncture of the third, 
fourth, and fifth rows from the suture distinctly larger than 
the rest, the head infuscate and the elytra unspotted. It 
is not likely to be confounded with any other species I 
know. 
Two specimens from Nagasaki. 
Gyrinid^. 
27. Gyrinus japonicus, n. sp. Ovalis, convexus, supra 
chalybeo-niger, lateribus ^enescens, elytris requaliter punc- 
tato-striatis, punctis apice subtilioribus ; subtus niger, 
prothoracis et elytrorum margine inflexo asneo-ferrugineo. 
Long. 2f— 3i Hn. ; lat. If lin. 
