On Aquatic Carnivorous Coleoptera or Dytiscide. 579 
850. Copelatus debilis, n. sp.—Ovalis, depressus, nitidus, piceo-testaceus, capite, 
prothorace lateribus, elytrorum basi et apice, antennis pedibusque testaceis ; elytris 
strus quinque elongatis, prima a sutura remota, striaque marginali anterius ab- 
breviata. Long. 4, lat. 2 m.m. 
The male has the front and middle tarsi a good deal dilated, the front tibiz are 
much curved inwardly and the basal portion slender: the upper surface is very 
smooth except for the strize on the wing-cases: the female differs a little from the 
male, the striz being slightly deeper, and there being a very fine and obsolete 
punctuation on the upper surface, but no scratches. 
The species is of small size and cannot be very easily mistaken for any other, on 
account of the number of the strie—five on each wing-case; the first of these is 
quite twice as far from the suture as it is from the second stria; then the three 
inner interstices are of about the one width, the fourth, or outer one, being a little 
narrower than the cthers; the submarginal stria is elongate, but stops short a good 
deal behind the shoulder. 
Central America, (Chontales, Belt ; 8. Geronimo, Guatemala, Champion). 1158. 
Group 10, (Nos. 851 to 864). 
Elytra with a submarginal stria and six other strize on each. 
In this group the striz are equidistant, and it is the alternate ones that are 
wanting; very frequently the first stria is much abbreviated in front, or indeed only 
exists on the posterior portion of the wing-case. 
$51. Copelatus marginatus (Wehncke), n. sp.—Ovalis, latiusculus, haud elongatus, 
subdepressus, piceus, capite et prothoracis elytrorumque lateribus dilutioribus, 
antennis pedibusque testaceis; prothorace sublevigato, ad angulos posteriores 
subtilius punctulato; elytris striis sex ad apicem prolongatis, interna posterius 
tantum exstat, ceteris elongatis, aliaque marginali valde abbreviata. Long. 6, lat. 
3¢ m.m, 
In the male the front and middle tarsi are a good deal dilated; the basal portion 
of the front tibia is quite slender, and its inner edge sinuate, the lower part of the 
tibia is broad; the elytra have a subobsolete punctuation, which in the female is 
replaced by the numerous very short and extremely fine scratches, 
Australia, (Rockhampton, Port Denison). 675, 
TRANS. ROY. DUB. SOC., N.S., VOL, IT. 4P 
