On Aquatic Carnivorous Coleoptera or Dytiscide. 729 
short scratches which are rather more widely separated from one another than in 
the form above mentioned: the size of a large specimen is 282 m.m. long, 153 m.m. 
wide, and 93 m.m. high. 
A few specimens from Sumatra, Borneo and Labuan, seem to be intermediate 
between the large broad form just mentioned, and the ordinary East Asiatic form. 
In Java the species appear to be very common, and the individuals from there 
are of a rather short, broad, robust form, with the yellow margin to the elytra 
broad, and the patches of pubescence on the two basal joints of the male intermediate 
tarsi broad, while the sexual sculpture of the females is slight or entirely wanting ; 
a male measures 25 m.m. long, by 14 m.m. broad, by 83m.m. high. 
The Cybister temninckii of Aubé is said to be from Java, it differs from all other 
Javanese individuals I have seen by its very elongate form ; one of the individuals 
which served Aubé for his description is before me, it is a female, with slight sexual 
sculpture, and is fully 30 m.m. long, 15 m.m. broad, by 9 m.m. high. 
A small series from Celebes, Batchian, Amboina, differ scarcely at all from the 
Javanese individuals, but are perhaps on the average a little larger in size; of four 
females before me from this locality, three have no sexual sculpture, and on the 
fourth the sculpture is but slight. 
A single female from Menado, agrees with the larger of the Philippine Island 
forins, except that the scratches forming its sexual sculpture are finer and 
denser. 
I have seen no specimens from New Guinea, though the species no doubt occurs 
there. 
In Australia the species is common, and I have before me a series of about 
twenty-four specimens from localities which indicate the species as there very 
widely distributed ; they differ scarcely at all from the Hast Asiatic form as found 
in China and Japan, but are perhaps on the average slightly larger in size, and the 
dark colour on the head usually approaches in the middle rather nearer to the 
labrum ; the male tarsi are the sameas in the Chinese form, and all the females 
show a fine sexual sculpture except one which is quite smooth. 
In New Caledonia the species appears also common; the individuals are rather 
shorter than the Australian individuals, and the patches of pubescence on the male 
intermediate tarsi are rather broader, so that here the specimens seem to approximate 
to the Javanese forms. The females have a slight sexual sculpture. 
One very large female from this localityis remarkable, it attains 293 m.m. in 
length by 16 m.m. broad, and has a largely developed sexual sculpture, so that it 
differs but little from the broader of the two forms mentioned as found in the 
Philippine Islands. Cybister artensis and C. nove-caledoniz, as well as Dytiscus 
hamatus described by Montrouzier from this locality seem all to be merely varieties 
of D. tripunctatus. | 
From Ceylon I have seen only a single pair, which are very small, but do not 
