520 On Aquatic Carnivorous Coleoptera or Dytiscide. 
Group 13. 
Prosternal process acutely raised or carinate along the middle, but its sides little 
depressed, so that it is not compressed, the sides evenly and distinctly margined ; 
metasternal groove well developed ; swimming legs elongate, rather slender ; wings 
of metasternum large or moderate ; male front tarsi little incrassate, their claws 
elongate. 
Two species, found in both the Old and New Worlds. 
724. Dytiscus confinis, Gyll:, Agabus confinis, M.C._—Oblongo-ovalis, nitidus, sub- 
leevigatus, niger, elytris fusco-nigris, externe vage rufescentibus, antennis pedibusque 
rufis, femoribus plus minusve piceis; elytris vix perspicue punctulatis. Long. 9, 
lat. 43 m.m. 
In the male the three basal joints of the front tarsi are but little thickened, and 
bear beneath small palettes which scarcely appear to be placed on hairs, the claws 
of the front feet are elongate, little curved, and scarcely sinuate beneath. In each 
sex the elytra appear smooth and shining, but when carefully examined excessively 
fine and obsolete distant punctures are found to exist, and moreover the female has 
excessively dense and fine regular reticulation. 
Northern Europe, and North America. (Sweden ; Finland to 68° North, Sahlberg; Lake Superior ; 
Kansas). 752. 
725. Agabus infuscatus, Aube, Spec. p. 330.—Oblongo-ovalis, niger, prothoracis 
lateribus vage rufescentibus, elytris fusco-nebulosis ad latera pallidioribus, antennis 
pedibusque rufis, femoribus infuscatis ; elytris densius subtilissimeque reticulatis, 
minus. nitidis, punctis subseriatis et apicalibus subobsoletis. Long. 8, lat. 4¢ m.m. 
This species is readily distinguished by the peculiar uneven or rugose surface of 
the intra-linear portions of the hind coxze. The male has the three basal joints of 
the front and middle tarsi but little incrassate, and furnished beneath with small 
palettes which do not appear to be placed on hairs; the claws of the front feet are 
elongate and almost straight and simple: the apical portions of the sixth to tenth 
joints of the antennee are a little swollen internally at the apex. The sculpture 
appears to be the same in each sex. 
I have great difficulty in believing this to be Aube’s A. infuscatus, though it is 
so identified by Leconte and others. 
United States of North America, (Lake Superior). 753, 
