On Aquatic Carnivorous Coleoptera or Dytiscide. 455 
-G. 
549. Dytiscus crux, Fab., Hydroporus crux, M.C.—Ovalis, sat brevis et convexus, 
latiusculus, fere impunctatus et pubescens, testaceo-castaneus, capite fusco, 
prothorace nigricante, lateribus ferrugineis, elytris sutura fasciaque lata irregulari 
in medio nigricantibus, antennis pedibusque rufis; prothorace versus latera stria 
impressa integra; corpore subtus obsolete punctato, sublevi. Long. 23, lat. 
1? m.m. 
This species varies a good deal in the markings of the elytra; behind the broad 
central fascia there is generally a smaller second irregular band, which is sometimes 
nearly confluent with the median one. I see no characters by which I can dis- 
tinguish the sexes. 
Southern France, and Northern Italy. (Nice, Spezia, Tuscany, Liguria). 309. 
550. Hydroporus sexguttatus, Aube, M.C.—Ovalis, minus convexus, fere 
angustus, sparsissime obsoleteque punctatus et pubescens, testaceo-castaneus, capite 
fusco, prothorace nigricante lateribus ferrugineis, elytris pictura variabili, sutura 
fasciisque latis irregularibus transversis plus minusve extensis et coalescentibus 
nigricantibus, antennis pedibusque rufis, illis apicem versus seepe infuscatis ; 
prothorace versus latera stria impressa, integra; corpore subtus nitido, obsolete 
punctato. Long. 2s, lat. ly m.m. 
This species is distinguished from the preceding one by its smaller size and 
narrower, less rounded form ; the colour is variable, often the black of the elytra 
occupies most of the area, leaving a basal interrupted fascia, and four large spots 
towards the extremity pale. I see no sexual characters. 
Corsica, Sardinia, Monte Cristo. 310. 
551. Hydroporus jucundus, Perris, Abeill., VII, p. 7.—Ovalis, sat elongatus, 
subdepressus, minus latus, impunctatus, vix nitidus, testaceo-castaneus, capite rufo- 
fusco, prothorace nigricante, lateribus ferrugineis ; elytris fascia mediali irregulari 
fusca; antennis pedibusque rufis, illis crassiusculis; prothorace versus latera stria 
impressa integra ; corpore subtus nitido, sublevi. Long. 25, lat. 15 m.m. 
The male has the antennz beyond the middle thicker than in the female. The 
species is closely allied to D. crux, (No. 549), and H. sexguttatus, but is more 
elongate and depressed, has the dark markings on the elytra more reduced, and the 
antennee thicker. 
Western Pyrenees. (Eaux bonnes). 311. 
