554 On Aquatic Carnivorous Coleoptera or Dytiscide. 
carina on the last ventral segment, and is only indistinctly rugose on each side; 
the female has the apical segment briefly plicate at the extremity, and forming a 
somewhat deep notch. 
This species should not be mistaken for I. subzeneus, for its outline is different, 
it being broadest behind the middle, the colour is darker, and the serial pnuctures 
of the elytra more distinct, and the outer claw on the male hind foot is different, 
and the anterior border of the hind coxa is more arched. 
It is also readily distinguished from Dytiscus obscurus (No. 782), by a difference 
of outline, by its more brassy colour, and the quite distinct reticulation at the 
apex of the elytra, &c., &c. It approaches perhaps more nearly to I. quadrimacu- 
latus, but its form is more convex, and broader behind the middle, the serial 
punctures of the elytra are more distinct, and the front border of the hind coxa 
approaches nearer to the middle coxa. 
Northern Europe. (Sweden and Finland to 67° 30’ according to Sahlberg.) 844. 
788. Dytiscus guttiger, Gyll., Llybius guttiger, M.C.—Ovalis, fere angustus, sat 
convexus, subopacus, niger, antennis rufis, pedibus piceis, elytris densius subtiliter 
reticulatis, punctis subseriatis sat conspicuis, guttulis duabus param conspicuis 
testaceis ; coxis posterioribus parcius obsolete strigosulis, margine anteriore extus 
minus abrupte deflexo ; prosterni processu apice elongato. Long. 93, lat. 4¢ m.m. 
In the male the basal joints of the front and middle tarsi are a little imcrassate, 
and are furnished beneath with moderately long hairs which bear minute palettes ; 
the claws on the front feet are not elongate, and are nearly simple, being slightly 
emarginate near the base ; on the hind feet the outer claw is a good deal shorter. 
than the inner one, and is somewhat thickened, and has a quite obtuse extremity ; 
the male has a short carina on the last ventral segment, and no rugosities ; the 
female has the apex of the last ventralsegment with a broad, but shallow emargination, 
and in the middle of it a thick short projection. 
Europe, (Sweden ; Finland to 63° 10’, Sahlberg ; Britain, France, Germany, Lithuania). 846. 
789. Ilybius ignarus, Lec., M.C.—Ovalis, angustus, haud convexus, subopacus, 
niger, antennis rufis, pedibus piceis; elytris densius subtiliter reticulatis, punctis 
subseriatis sat conspicuis, guttulis duabus parum conspicuis testaceis; coxis 
posterioribus parce subtiliter strigosulis, margine anteriore extus minus abrupte 
deflexo ; prosterni processu apice elongato. Long. 9, lat. 43 m.m. 
The male has the basal joints of the front and middle tarsi distinctly incrassate, 
and furnished beneath with moderately long hairs which bear minute palettes ; the 
front claws are moderately elongate and distinctly sinuate beneath ; on the hind 
feet, the outer claw is but little shorter than the inner one, and has a very minute, 
