On Aquatic Carnivorous Coleoptcra or DijtiscidaB. 479 



624. Hydroporus rufilabris, n. sp. — Oblongo-ovalis, fere depressus, evidenter 

 pubescens, subtilissime punctatus, subnitidus, nigricans, capite anterius, pedibus 

 prothoracisque lateribus rufis, antennis fuscis, basi rufo ; subtus nitidus, coxis 

 posterioribus obsolete punctatis, abdomine tantum basi utrinque punctato ; prosterni 

 processu leviter compresso, medio sat carinato. Long. 4, lat. 2i m.m. 



Mas^ tarsis anterioribus leviter dilatatis. 



This species is allied to H. modestus, (No. 627), but is readily distinguished by 

 the smaller size, and by the much slighter differences between the sexes. 



North America, (Texas ; a pair of this species I received from Belfrage as H. rufilabris, Zimm.) 330. 



625. Hydroporus ruficeps, Aube, M.C. — ?Oblongo-ovalig, satconvexus, evidenter 

 pubescens, obsolete punctatus, opacus, nigricans, antennis pedibus capiteque rufis, 

 thoracis elytrorumque limbo rufescente; subtus sat nitidus, coxis posterioribus 

 crebre evidenter punctatis, abdomine polito, tantum basi utrinque punctato, limbo 

 rufescente ; prosterni processu vix compresso, sed medio longitudinaliter distincte 

 elevato. Long. 4|, lat. 2§ m.m. 



I have seen of this species only females ; they may be readily distinguished from 

 that sex of H. modestus (No. 627), by the more punctured hind coxse; they have 

 the prosternal process a little less compressed, and show several other small differ- 

 ences. 



North America, (Massachusetts). 329. 



626. Hydroporus axillaris, Lee, M.C. — c^Elongato-ovalis, convexus, densius sub- 

 tiliter pubescens et punctatus, subopacus, nigricans, antennis pedibusque rufo- 

 obscuris, elytris fuscis limbo dilutiore ; prosterni processu fortiter compresso, coxis 

 posterioi'ibus omnino obsolete punctatis, abdomine distinctius, segmento apicali 

 dense punctato. Long. 5, lat. 2i m.m. 



A single typical specimen from the cabinet of Dr. Leconte, is all I have seen ot 

 this species; though it is deprived of its tarsi, I have no doubt it is a male. It 

 is different in form from H. modestus, being narrower in front, and may very 

 readily be distinguished by the more punctate ventral segments. 



North America. 328. 



627. Hydroporus modestus, Aube, M.C. — Oblongo-ovalis,/ere depressus, evidenter 

 pubescens, obsoletis-ime punctatus, nigricans, prothoracis lateribus elytrorumque 

 limbo lateral! dilutioribus, pedibus rufis, antennis basi rufo, apice fusco ; subtus 

 nitidus coxis posterioribus omnino obsolete punctatis, abdomine polito, tantum 

 basi utrinque punctato, lateribus scepius rufo-maculatis ; prosterni processu lev'iter 

 compresso, medio evidenter carinato-elevato. Long. 5, lat. 2| m.m. 



