454 On Aquatic Carnivorous Coleoptera or Dytiscide. 
nigris; prothorace utrinque striola impressa; pectore parce punctato. Long. 
22, lat. 14 m.m. 
Mas, tarsis anterioribus fortiter dilatatis, unguiculis elongatis, vix ineequalibus. 
This species resembles entirely the larger specimens of H. varius in which the 
black marks of the elytra are least extensive, and is so far as I can see distinguished 
only by the front tarsi of the male. I have seen only two individuals. 
Algeria. 316. 
546. Hydroporus fractus, n. sp.—Oblongo-ovalis, angustulus, depressus, parce 
subtilissime punctatus et pubescens, sat nitidus, fuscus, antennis, prothoracis lateri- 
bus, pedibus elytrisque testaceis, his signaturis irregularibus fuscis; prothorace 
utrinque striola impressa ; pectore parcius obsolete punctato. Long. 2s, lat. 1$ m.m. 
This is very closely allied to the smallest specimens of Hydroporus varius, but is 
smaller, narrower, more parallel and depressed, and the dark colour is much more 
dilute. 
I have seen only four individuals. I think they are all males, and have the front 
tarsi moderately broad. 
South Europe, and Algeria; (Beziers, Stazzano, Bone). 317. 
547. Dytiscus flavipes, Oliv., Hydroporus flavipes, M.C_—Oblongo-ovalis, sat 
convexus, parce subtilissime punctatus, tenuiter pubescens, subnitidus, nigricans, 
antennarum basi, pedibus, prothoracis lateribus elytrorumque lineis plus minusve 
interruptis et confluentibus testaceis; prothorace versus latera striola minuta ; 
pectore fere impunctato. Long. 23, lat. 12 m.m. 
This species varies much as to the marks on the elytra, which sometimes form 
four nearly regular lines, and are sometimes much broken up and diminished. The 
male has the front tarsi a little dilated but the claws are quite small. 
Europe and Northern Africa, (Smyrna, sec. Bedel), absent from Northern Europe. 318. 
548, Dytiscus pictus, Fab., Hydroporus pietus, M.C.—Ovalis, brevis, convexius- 
culus, parce subtiliter punctatus, tenuiter pubescens, sat nitidus, fusculus, capite 
prothoracisque lateribus dilutioribus, elytris testaceis, sutura latius maculaque 
versus latus nigris; prothorace versus latera utrinque striola parva; pectore nitido 
fortiter punctato. Long. 23, lat. vix 1) m.m. 
Mas, tarsis anterioribus evidenter dilatatis, unguiculo anteriore incrassato ; tibiis 
posterioribus evidenter dilatatis, intus pectinato-setosis. 
The lateral spot of the elytra is sometimes confluent with the large sutural 
mark. 
Europe. Widely distributed and common, from 66° 22’ north, (according to Salblberg), to the 
Pyrenees. 319. 
