JAN. — MAR. 1857.] Dcserijitions of new Ceylon Cokoptera, 185 
round either elytron. The first and second on either side run to- 
wards the apex but come to a stop (very abrupt in most, but less 
so in some specimens) before reaching it, the third after having 
been interrupted near its base by the subhumeral cavity runs on 
but does not reach as far as the former, the 4th does not leave the 
region of the shoulder, the last on either side is very prominent at 
the base but soon forms an abrupt declivity and runs on as a low 
i'idge to below the middle. The back of all these costse is obtusely 
dentated. The interstices ars marlied with large, shallow, trans- 
verse impressions. The head of the insect is rather large and even. 
The mandibles are furnished with an obtuse subapical tooth, the 
two lower thirds are ciliated. The maxillae have the apex of the outer 
lobe externally enlarged, rounded off and furnished with three strong 
teeth replaced by cilia on the inside, the inner lobe is conic and 
similarly provided with teeth and cilia, however, much thinner and 
finer. The maxill. palpi are robust, the last joint is inflated at the 
base. The antennal club is hairy, dark (whilst the remaining joints 
are yellowish), conic and somewhat securiform, the 6th joint being 
inserted on one side of the 7th. The legs are robust, the tibiae 
slightly curved, obliquely truncated at the end, furnished with 
spines along the outside and with distant cilia along the inner. 
27. Eydrochus lacustris. N. 
H. elongatus, subdepressus, supra metallicus, iridescens, subtus 
piceus, pedibus, antennis, palpis elytrorumque margine magis mi- 
nusve brunneis, mento cyaneo. Long. corp. m. 1 lin., f. multo 
major atque robustior. 
Palpi maxill. robusti, art. ultimo elliptico leviter inflato. Mandi- 
bulae apice bifidae. Antennarum clava dense pilosa. Thorax ob- 
longe quadratus basin versus angustatus basi medio productus, cum 
capite profunde punctata. Elytra ad humeros oblique truncata, 
apicem versus sat fortiter angustata, profunde striatopunctata. Tibiae 
extus spinulosae. 
Specimina nonnulla in lacu Colomb. legi. 
The head is robust, broader than the thorax, the eyeis large and 
prominent. 
