On Aquatic Carnivorous Coleoptera or Dytiscide. 783 
minime profunda, attamen perspicua et in seriebus secunda et tertia minus obsoleta ; quoad. colorem 
elytra nigra apparent ; vitta basalis a scutello ad humeros extendit, haud basin attingens, tenuis equalis, 
recta (aut sub-circularis et ad marginem medium leviter sese flectens), ad vitt 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 insularis, ad ipsum marginem, nunc vitta transversalis, inequalis, communis, 
lata, et ad apicem ipsum pertingens) ; corpore subtus nigro-fusco ; antennis flavis ; pedibus flavis, posticis 
fuscis et flavo-annulatis. Long. corp. lin. 4; lat. lin. 23.” 
“ 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. 5. 
1323. Hydaticus xanthomelas, Brullé, Aubé, Spec., p. 181. Corrientes. South America. 
“‘ Oblongo-ovalis, convexiusculus ; thorace rufo-testaceo, antice et postice nigro ; elytris nigris, cum 
margine lato, in medio longitudinaliter divisa vittaque ad basin bi-interrupta luteis ; corpore subtus 
nigro-piceo. Long. 10 m.m. larg. 53 m.m. . 
[Aubé, 1. c., gives a description in addition to the above diagnosis. | 
1324. Hydrocanthus auritus, Regt., Ann. Soc. Fr. 1877, p. Ixxix. Manilla. 
“Ovalis, sat elongatus, postice attenuato-acuminatus ; omnino niger, preter macula testacea ad 
angulum anticum prothoracis, antennee pedesque antici et intermedii testacei, postici nigro-ferruginei. 
Long. 22 & 3 m.m.” 
At p. 359, op. ct#., an additional description is given of this species : it should no doubt be assigned to 
the genus 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 margineque laterali ferrugineis ; 
corpore subtus, ore antennis pedibusque rufo-testaceis. Long. lin. 1:1, lat. lin. 0°65.” 
Buenos Ayres. 
T cannot form a valid opinion as to what genus this should be referred to; but it clearly does not 
belong to Hydrocanthus, heyj., op.—D.S. 
1326. Hydrocanthus lineatus, 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 fliigeldecken leicht kenntlich, eiformig, nach hinten verengt, gewolbt und 
glinzend. Kopf und halsschild rothbraun, glatt, letzteres am hinterrande etwas dunkler und mit 
einzelnen feinen Punkten besetzt. Fliigeldecken schwarz, der seitenrand und drei lingsstreifen gelb. 
Die streifen beginnen an der basis und erreichen, der erste und dritte fast die spitze, wahrend der mittlere 
“hinter der mitte verschwindet. Der dusserestreifen theilt sich vorn gabelformig und vereinigt sich an 
der schulter mit dem seitenrande. Unterseite 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. 8. 
