On Aquatic Carnivorous Coleoptera or Dytiscide. 507 
694. Dytiscus uliginosus, Linn., Agabus uliginosus, M.C-—Ovalis, convexus, 
nitidus, niger, supra subsenescens, capite anterius, prothoracis lateribus, elytris 
humeris et lateribus rufescentibus, antennis pedibusque rufis; elytris nitidis et 
obsoletissime reticulatis, rarius in femina opacis et densissime reticulatis ; prothorace 
margine laterali lato. Long. 7, lat. 4¢ m.m. 
This species is of a shorter, broader, and more convex form than its allies. The 
male has the basal joints of the front tarsi a good deal incrassate, and clothed 
beneath with short glandular hairs, the claws on the front feet are short, and the 
anterior one is greatly thickened beneath so as to appear angulate, or obtusely 
dentate about the middle. The female generally resembles the male in sculpture, 
but a form occurs rarely (? in Britain only) in which the upper surface in this sex is 
excessively densely and finely reticulate so as to be quite opaque. The species has 
the hind cox but little developed; the prosternal process is moderately broad, 
and not elongate, its sides a ttle compressed, and its surface not shining, but feebly 
punctate ; the mesosternal groove is short and narrow. 
Europe, (Sweden, Finland, Britain, France, Belgium, Alsatia, Germany). 743. 
695. Colymbetes semipunctatus, Kirby, Agabus semipunctatus, M.C.—Oblongo- 
ovalis, niger, nitidus, supra vix venescens, capite anterius prothoracisque lateribus 
rufescentibus, antennis pedibusque rufis ; elytris nitidis, obsoletissime reticulatis, vix 
punctulatis ; prothorace margine laterali lato. Long. 7, lat. 3: m.m. 
In the male the front tarsi are short, and, as well as the middle ones, have the 
three basal joints distinctly incrassate and furnished beneath with short hairs bearing 
small palettes, the claws of the anterior tarsi are short, and the front one bears an elon- 
gate acute tooth in the middle beneath. The female Ihave not seen. The species is 
undoubtedly nearly allied to Dytiscus uliginosus, but has the prosternal process 
rather broader and more smooth and shining. 
North America, (Canada). 747. 
696. Agabus (Gawrodytes) eneolus, Crotch, Tr. Am. Ent. Soc. IV, p. 417.— 
Ovalis,sat convexus, niger, supra zenescens, capite anterius, prothoracis elytrorumque 
lateribus late rufescentibus, antennis pedibusque rufis; supra vel nitidus et in 
elytris obsolete reticulatus subtiliterque punctulatus (¢), vel sericeo-opacus, subtilius 
denseque reticulatus (?). Long. 62, lat. 34 m.m. 
This species is extremely similar in size and form to the HKuropean Dytiscus 
femoralis (No. 726). The difference in the appearance of the two sexes is very 
striking. The male has the basal joints of the front and middle tarsi a good deal 
thickened, and furnished beneath with moderately long and glandular hairs ; the 
TRANS. BOY. DUB. SOC., N.S., VOL. I. 3 U 
