On Aquatic Carnivorous Coleoptera or Dytiscida. 559 
supra subopacus, densius reticulatus ; elytris guttulis duabus pallidis, ad apicem 
parum sinuato acuminatis; coxis posterioribus evidenter reticulatis, margine 
anteriore externe parum curvato. Long. 103, lat. 6 m.m. 
This species is excessively similar to Dytiscus obscurus (No. 782), but the male 
claws are slightly different; on its hind feet the outer claw is more slender and 
rather longer, and has a minute deflexed sharp extremity ; while on the front feet 
the anterior claw is a little thickened near the base, and appears scarcely sinuate 
beneath, and the posterior claws are without the minute projection in the middle of 
its hind margin: the apical ventral segment is deeply rugose on each side: the 
female is very difficult to distinguish from D. obscurus, but the apex of the elytra 
is less sinuate, and the reticulation there is not quite so obsolete. 
Europe, (Sweden ; France, Limoges; Germany). 928. 
799. Tlybius laramzeus, Lee., M.C.—Ovalis, angustulus, haud brevis, sat convexus, 
subtus piceus, supra nigro-zeneus, limbo anterius ferrugineo, antennis pedibusque 
anterioribus rufis, pedibus posterioribus piceis ; supra subopacus, elytris densius 
reticulatis, guttulis duabus pallidis quarum posteriore conspicua ; coxis posterioribus 
subtiliter strigosulis, margine anteriore extus abrupte curvato, prosterni processu 
elongato. Long. 10, lat. 54 m.m. 
I have only a single immature individual of this species before me; it is a male 
and its sexual characters seem to be just the same as those of Dytiscus biguttulus 
(No. 797), but the form is so much narrower that I think it will prove to bea 
distinct species. 
North America. 929. 
800. Ilybius confusus, Aubé, M.C.—(Immaturus) ; Ovalis, sat convexus, haud 
elongatus, ferrugineus, supra posterius cenescens, crebrius subtiliter reticulatus, 
elytris guttulis duabus pallidis, coxis posterioribus crebrius reticulatis, margine 
anteriore extus abrupte curvatis. Long. 112, lat. 64 m.m. 
The male has the basal joints of the front and middle tarsi a little dilated and 
furnished beneath with moderately long hairs, bearing small palettes; the claws 
of the front feet are nearly simple, the hinder one however being emarginate near 
the base, on the hind feet the outer claw differs but little from the inner one, 
except that it is distinctly shorter. The apical ventral segment is quite destitute 
of carina or rugosities. 
I have seen of this species only one male (from Dejean’s collection) very immature 
and in very bad condition. I should think the species will prove to be most allied 
to I. inversus, (No. 785), but it has the coxee more densely and distinctly sculptured 
and the last ventral segment of the male without carina: and the front border of 
the hind coxa has its outer part rather more abruptly deflexed. 
North America. (Coll. de Bonyouloir, ex mus, Dejean). 840. 
