454 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



nigris ; prothorace utrinque striola impressa ; pectore parce punctate. Long. 

 2f, lat. Ij m.m. 



Mas, tarsis anterioribus fortiter dilatatis, unguiculis elongatis, vix insequalibus. 



This species resembles eiitirely 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. 31 G. 



546. Hydroporus fractus, n. sp. — Oblongo-ovalis, angustulus, depressus, paice 

 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. 2?, lat. li 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., Hydroioorus Jlavipes, M.C — Oblongo-ovalis, sat 

 convexus, parce subtilissime punctatus, tenuiter pubescens, subnitidus, nigricans, 

 antennarum basi, pedibus, prothoracis lateribus elytroruraque lineis jilus minusve 

 interruptis et confluentibus testaceis ; prothorace versus latera striola minuta ; 

 pectore fere impunctato. Long. 2|, lat. \h m.m. 



This species varies much as to the marks on the elytra, which sometimes form 

 four nearly regular lines, and are sometimes mvich 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 pictus, 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. 21, lat. vix li m.m. 



Mas, tai'sis 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 Salhlberg), to the 

 Pyrenees. 319. 



