554 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



carina on the last veutral 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. subieneus, for its outline is diflferent, 

 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 moi-e 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 SaUberg.) 844. 



7S8. Dytiscus guttiger, Gyll., Ib/biiis gnttiger, M.C. — Ovalis, fere angustus, sat 

 convexus, subopacus, niger, antennis rufis, pedibus piceis, elytris densius subtiliter 

 reticulatis, punctis subseriatis sat conspicuis, guttulis duabus parum conspicuis 

 testaceis ; coxis posterioribus parcius obsolete strigosulis, margine anteriore extus 

 minus abrupte deflexo ; prosterni processu apice elongato. Long. 9j, lat. 4| m.m. 



In the male the basal joints of the front and middle tarsi are a little incrassate, 

 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 ventral segment 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, Litliuania). 846. 



789. Ilybius ignarus, Lee, M.C. — Ovalis, angustus, baud 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. 4f 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. 



