JAN. — MAR ISb^.] Descriptions Of neiv Ceylon Coieoptera. 187 
prosternal part has a sharp edge, whilst the mesosternal one is ob- 
tuse on the back and the metasternal part depressed and slightly 
grooved. 
29. Hydrous inconspicuus . N. 
H. prsecedente minus convexus, supra oleagino-niger, subtus 
rufo-piceus, ore testaceo. Long. corp. 4J lin. 
Palpi maxill. art. 2° et 4° subcylindricis, 3® apicem versus 
sensim incrassato, sequente tertia jparte longiore. Antennae art. 
7-8 sub-globosis, 9® magno, (Tvato. Caput, thorax et elytra ut in 
prsecedente sculpta ^t sign^ta. 
In lacu Colomb. mens,,Jun. non infrequenter cepi. 
This is in every respect a normal species. The prosternal carina 
has a sharp edge, the claws are simple, the antennal club is com- 
posed of rounded joints, the elytra are of the typical structure etc. 
In the latter respect as well as with regard to the various series of 
punctures upon head, thorax and elytra, it resembles the former, 
the punctures of the elytra are, however, less distinct. Joints 1-6 
of the antennae are yellowish, the club being dark and finely pu- 
bescent. The maxill. palpi have joints 2 and 4 subcylindric but 
the intermediate one thickened towards the tip. 
In the month of June, I have not unfrequently taken the pupae of 
this species on the banks of the Colombo lake and hatched them 
ftt home. I found them about one inch under ground and often as 
far as 12 feet from the edge of the water but still in muddy places. 
The imago is very active, perhaps more so than any other species 
of the g. 
No. III. 
GENERAL REMARKS ON THE SCTDMiENI DESCRIBED BELOW. 
In the first number of these papers I have described a winged 
species of (Edichirus, a g. supposed to be without organs of flight ; 
in the second number I have given publicity to the more important 
discovery of wings in the single g. which forms the family of the 
Georyssi, also hitherto supposed to be apterous ; at present I am 
about to announce to some and to confirm to others, the existence 
