On Aquatic Carmvorous Coleoptera or Dytiscida. 267 
25. Noterus levis, Sturm, M.C.—Ovalis, latiusculus, sat convexus, nitidus, 
castaneus, antice dilutior; elytris apicem versus punctis minutis ; prosterno medio 
carinato ; femoribus posterioribus subtus apice macula densa pubescentiz. Long. 43, 
lat. 2} m.ra. 
Mas, antennis breviusculis, irregularibus, articulo quinto maximo, quam sexto 
valde transverso latiore et duplo longiore, articulis 7—10 longitudine latioribus ; 
corpore subtus femoribusque colore obscuriore ; tibiis posterioribus intus densissime 
ciliatis. 
Fem., antennis fere regularibus, corpore subtus ferrugineo, fere concolore. 
Southern Europe, and Algeria. 524. 
II. 2.—Group Supuistnt. 
Swimming legs very feeble, rather widely separated at their articulation ; the 
femora with elongate ciliz at the extremity of their hind margin; front cox 
placed very near the front edge of the prosternum, this latter thickened along the 
middle longitudinally ; front tibise very twisted, with an extremely large terminal 
hook. 
The group comprises only two genera; they are remarkably globose insects, 
although distinctly acuminate behind. 
Prosternum forming a prominent angle in front of anterior . . 
coxe. <A single North American species. COLPIUS (vide below.) 
Prosternum flexed in a gradual curve in front of anterior Us 
cox. South American and West Indian species, SUPHIS (vide p. 268.) 
I. 7.—Genus COLPIUS. 
Middle of the prosternum so prominent in front that it forms a conspicuous 
outstanding rectangle; epipleurz abruptly inflexed, horizontal through their whole 
length. 
The unique species is North American. 
26. Colpius inflatus, Leconte, M.C.—Convexus, ovalis, posterius sat acuminatus, 
sine pubescentia, opacus, niger, antennis pedibusque rufis, supra sanguineo- 
maculatus, subtus capite thoracisque lateribus rufescentibus ; elytris fortiter 
punctatis ; corpore subtus opaco, coxis punctis paucis magnis, abdomine impunctato, 
margine apicali setoso. Long. 33, lat. 24 m.m. 
United States, (Louisiana, Florida, fide Crotch). 463. 
TRANS. ROY. DUB. SOC., N.S. VOL. II. 2N 
