On Aquatic Carnivorous Coleoptera or Dytiscide. 403 
This species was described by Sahlberg as Ceelambus unguicularis, but as Crotch 
had recently described another species under that name, I have been obliged to 
find a new one for Sahlberg’s species. 
Siberia, (Jenisei, July, 1876, Dr. J. Sahlberg), 458. 
408. Hydroporus dissimilis, Har., M.C.—Ovalis, convexiusculus, nitidus, sine 
pubescentia, ferrugineus, abdomine pectoreque nigris; el ytris sat crebre ineequaliter 
punctatis ; corpore subtus nitido, coxis posterioribus fortiter punctatis. Lone. 4, 
lat. 23 m.m. 
I have seen but a single female of this species which is very close to the more 
sparingly punctured forms of Dytiscus impresso-punctatus, (No. 409), but is very 
shining beneath. 
North America, (Illinois, Lake Superior, New York). 207. 
409. Dytiscus impresso-punctatus, Schall., Zydroporus picipes, M. C.—Oblongo- 
ovalis, sat angustus, convexiusculus, glabriculus, pectore abdomineque nigris, supra 
obscure ferrugineus, vertice utrinque, prothorace basi elytrisque lineis indistinctis 
nigricantibus ; elytris basi fortiter profunde inzequaliter punctatis, stria suturali 
aliisque duabus externis punctorum ad _ basin impressis, apicem versus dense fere 
sequaliter punctatis ; coxis posterioribus crebre, fortiter profunde punctatis. Long. 
5, lat. 23 m.m. 
Mas, tarsis anterioribus et intermediis bene dilatatis, anterioribus unguiculo 
interno leviter incrassato. 
Fem., (a) ut in mare punctata et nitida. 
(>) omnino opaca, elytris dense eequaliter magis subtiliter punctatis, 
seriebus punctorum impressis obsoletis. 
This species varies greatly in size, colour, and in the punctuation of the upper 
surface ; in some of the varieties the impressed series of punctures are scarcely to be 
distinguished. 
H. decemlineatus, Mann. and H. picatus, Kirb., are North American varieties. 
Europe and Asia Minor, Siberia, Sitka, and United States of North America, 205. 
410. Celambus elevatus, n. sp.—Ovalis, convexus, breviusculus, nitidus, testaceo- 
ferrugineus, elytris lineis elongatis, alternis ad basin abbreviatis, fuscis; coxis 
posterioribus externe parce punctatis. Long. 4, lat 23 m.m. 
This species is very similar to H. saginatus, Schaum, (No. 412), but is much 
shorter, and the under surface is pale: the only individual I have seen is a female, 
the wing-cases are shining at the base, and the punctuation there consists of not 
TRANS. ROY. DUB. SOC., N.S., VOL. II. BE 
