670 On Aquatic Carnivorous Coleoptera or Dytiscide. 
which nearly reaches the scutellum. In other respects the species agrees closely 
with D, vittatus. 
I have seen only a single male. 
Borneo. 1042. 
1048. Hydaticus bowringi, Clk., M.C.—Ovalis, latus, convexus, capite anterius 
testaceo, posterius nigro, prothorace testaceo basi transversim in medio, margineque 
anteriore in medio, nigris, elytris perspicue punctulatis, nigris, vittis duabus elongatis 
punctoque rotundato prope scutellum testaceis ; corpore subtus ferrugineo, antennis 
pedibusque anterioribus testaceis, tibiis intermediis piceis, tibiis tarsisque posteriori- 
bus nigris. Long. 14, lat. 9 m.m. 
This species seems closely allied to Dytiscus vittatus, but is rather larger and 
broader, it is paler beneath, and has the punctuation of the elytra coarser, the thorax 
is in greater part yellow, the external yellow stripe on the elytra is more elongate 
and the inner one is nearer to the suture, and there is always a conspicuous yellow spot 
near the scutellum. In most other respects it resembles the well known D. vittatus. 
The male tarsi are much the same in the two species, except that in H. bowringi 
the fringing hairs on the anterior feet are rather better developed: the female has 
an indefinite patch of dense fine sculpture on each side of the thorax. 
Sometimes the external yellow stripe of the elytra is a little abbreviated and then 
does not connect with the inner stripe, it always however extends much beyond 
the middle. 
Japan, China, (Che-fou), (Australia? teste Clark). 1043. 
1049. Dytiscus vittatus, Fab., Hydaticus vittatus M.C.—Ovalis, sat latus et 
convexus, niger, capite anterius prothoraceque ad latera testaceis, elytris vitta 
elongata cum margine externo parallela testacea, aliaque humerali abbreviata seepius 
cum vitta elongata ad dimidiam partem longitudinis conjuncta ; antennis pedibusque 
anterioribus testaceis, tibiis intermediis piceis, femoribus fusco-testaceis. Long. 12, 
lat. 7 m.m. 
In the male of this species there are about twenty-two palettes on the underside 
of the not very large front tarsi, and the frmging hairs round the base are short : 
the intermediate tarsi have the three basal joints moderately incrassate and bearing 
beneath two series of small palettes, these series are separated by a distinct glabrous 
space or line, and the inner of the two series is rendered irregular by the 
addition of a supernumerary palette near the base; these palettes are about fifteen 
in number altogether. 
The females have generally a patch of sexual sculpture on each side of the thorax, 
this however is very variable in its character and is sometimes entirely wanting : in 
