On Aquatic Carnivorous Coleoptera or Dytiscidce. 783 



minime profunda, attainea perspicuii et in seriebus secunda et tertia minus obsoleta ; quoad colorem 

 elytra nigra apparent ; vitta basalis a scutello ad liumeros extendit, haud basin attingens, tenuis jequalis, 

 recta (aut sub-circularis et ad marginem medium leviter sese flectens), ad vittse terminum margo usque 

 ad humerum late flavescit ; pone medium inter seriem punctorum tertiam et marginem macula flava 

 apparet, subquadrata aut aliquando in duas divisa ; ad apicem quoque altera, major, figura et statura 

 incerta (nunc macula iasularis, ad ipsum marginem, nunc vitta transversalis, insequalis, communis, 

 lata, et ad apicem ipsum pertingeus) ; corpore subtus nigi'O-fusco ; antennis flavis ; pedibus flavis, posticis 

 fuscis et flavo-annulatis. Long. corp. lin. 4 ; lat. lin. '2^." 



" One of the smallest species of the genus ; and to be also recognized by its more than usually distinct 

 punctuation, as well as by the pale regular transverse band on its black elytra." 



The species is probably South American, and allied to H. rectus (No. 1017). — D. S. 



1323. Hydaticus xanthomelas, Brulle, Aube, Spec, p. 181. Corrientes. South America. 



" Oblongo-ovalis, convexiusculus ; thorace rufo-testaceo, antice et postice nigro ; elytris nigris, cum 

 margine lato, in medio longitudinaliter di\dsa vitta(pie ad basin bi-interrupta luteis ; corpore subtus 

 nigro-piceo. Long. 10 m.m. larg. 5^- m.m. 



[^Aube, 1. c, r/ives a description in addition to the above dia(/no&-is.l 



132Jr. Hvdiocanthus auritus, Regt., Ann. Soc. Fr. 1877, p. Ixxix. Manilla. 



" Ovalis, sat elongatus, po.stiee attenuato-acuminatus ; omnino niger, prseter macula testacea ad 

 angulum anticum prothoracis, antennse pedesque antici et intermedii testacei, postici nigro-ferrugiaei. 

 Long. 2J a 3 m.m." 



At p. 359, op. cif., an additional description is given of this species : it should no doubt be assigned to 

 the gentis Canthydrus. — D. S. 



1325. Hydrocanthus fasciatus, Steinl., Atti. Soc. Ital. Sci. Nat., XII, p. 250. South America. 



" Oblongo-ovalis, obconicus, antice ampliatus, nitidus ; capite thoraceque ferrugineis, indistincte 

 punctulatis ; elytris ad basin thoracis latitudine, nigro-piceis, fascia media margiueqne laterali ferrugineis ; 

 corpore subtus, ore antennis pedibusque rufo-testaceis. Long. lin. I'l, lat. lin. 0'65." 



Buenos Ayres. 



I cannot fonn a valid opinion as to what genus this should be referred to ; but it clearly does not 

 belong to Hydrocanthus, huj., op. — D. S. 



1326. Hydrocanthus Hneatus, Wehncke, Berl. Zeit. XX, p. 221. Mexico. 



" Ovatus, postice attenuatus, convexus, nitidus, capite thoraceque ferrugineis, hoc postice fusco, elytris 

 nigris, testaceo-lineatis, pedibus luteis. Long. 3 m.m. 



" Durch die gelbgestreiften flligeldecken leicht kenntlich, eiformig, nach hinten verengt, gewolbt und 

 glanzend. Kopf und halsschUd rothbraun, glatt, letzteres am hinterrande etwas dunkler und mit 

 einzelnen feinen Punkten besetzt. Flligeldecken schwarz, der seitenrand imd drei langsstreifen gelb. 

 Die streifeu beginnen an der basis und erreichen, der erste und dritte fiist die s])itze, wahrend der mittlere 

 hinter der mitte verschwindet. Der iiusserestreifen theilt sich vorn gabelfonnig und vereinigt sich an 

 der schulter mit dem seitenrande. TJnterseite ist rothbraun, die beine gelb." 



The description agrees with Canthydrus "centralis, (No. 49), except that the thorax is described as being 

 only dark behind : the name cannot be used on account of the Suphis lineatus, Horn, which belongs to 

 the same genus. — D. S 



