On Aquatic Carnivorous Coleoptcra or Dytiscidce. 455 



G. 



54!). 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 irregular! 

 in medio nigricantibus, antennis pedibusque rufis ; jsrotborace versus latera stria 

 impressa integra ; corpore subtus obsolete punctato, sublsevi. Long. 2f , lat. 

 li m.m. 



This species varies a good deal in the markings of the elyira ; 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 siepe infuscatis ; 

 prothorace versus latera stria impressa, integra; corpore subtus nitido, obsolete 

 punctato. Long. 2|, lat. li 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, sublsevi. Long, 21, lat. li m.m. 



The male has the antennte 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 

 antennaj thicker. 



Western Pjrrenees. (Eaux bonnes). 311. 



