464 On Aquatic Carnivorous Coleoptera or Dytiscide. 
testaceis, elytris sionaturis basalibus et externis pallidis; coxis posterioribus crebre 
sat fortiter punctatis ; abdomine segmento apicali densius pubescente, sed margine 
summo nudo denseque rugoso punctato. Long. 42, lat. 25 m.m. 
The male has the front and middle tarsi broader than the female. The species 
is extremely closely allied to D. planus, but the yellow marks at the base of the 
elytra are distinct and definite and there is a little difference in the sculpture and 
pubescence of the last ventral segment. The species appears to be variable accord- 
ing to locality; the individuals from Andalusia have the pubescence less white and 
conspicuous than those from the South of France; a variety from Corsica, (H. 
bonnairei, Fairm.) is remarkable from the very conspicuous pubescence; I have 
however only seen a single specimen of it. 
Southern Europe, Corsica ; Northern Africa, (Andalusia, Algeria). 377. 
577. Hydroporus brucki, Wehncke, Deutsch. Ent. Zeit. 1875, p. 234.—Ovalis, 
minus, convexus, evidenter pubescens, crebre vix fortiter punctatus, niger, capite 
rufescente medio late infuscato, prothorace lateribus anguste testaceis, basi 
lateribusque plus minusve vage testaceis, antennis pedibusque rufis, coxis poste- 
rioribus fortiter punctatis; abdomine segmento apicali minus dense pubescente 
apice dense punctato. Lone. 43, lat. 23 m.m. 
I have only seen two individuals in bad condition of this species ; it appears to 
be extremely closely allied to Dytiscus planus (No. 575). 
South Eastern Europe; (Crimea). 376. 
578. Hydroporus imbatus, Aube, M.C.—Oblongo-ovalis, sat convexus, evidenter 
sed haud dense pubescens, nitidus, fortiter punctatus, niger, capite rufescente medio 
late infuscato, prothoracis lateribus, elytris signaturis basalibus et marginalibus, 
antennis pedibusque testaceis ; coxis posterioribus fortiter profundeque punctatis ; 
abdomine segmento apicali haud pubescente, fortiter sed haud dense punctato. 
Long. 43, lat. 23 m.m. 
The sexual characters appear very slight. The species is allied to Dytiscus 
planus (No. 575), but is more coarsely punctured, and the upper surface is more 
variegated ; it varies in size and form, to a considerable extent, some individuals 
being nearly similar in these respects to D. planus, while others are narrower and 
more convex; the yellow markings at the base and outer margin of the elytra also 
vary in their extent and definition. 
Corsica, Sardinia and south of Spain. 3795. 
579. Hydroporus analis, Aubé, M.C.—Ovalis, sat convexus, crebrius evidenter 
pubescens, sat nitidus, niger, capite anterius et in vertice rufescente, prothorace 
