640 On Aquatic Carmvorous Coleoptera or Dytiscide. 
interstices between the grooves by impressions or divisions, and I have one 
individual in which this is carried to such an extent that the tenth interstice is 
represented only by some detached granules, and the ninth is also greatly divided. 
Europe; Asia Manor! sec. Bedel. (Sweden ; Finland, 60° 50’ Sahlberg; England; France ; Germany. 
941. 
992. Dytiseus pisanus, Lap., M.C.—Subtus testaceus, metasterno in medio 
suturisque plus minusve nigricantibus, supra nigro-olivaceus, prothorace limbo 
omni elytrorumque lateribus flavo-marginatis, antennis pedibusque testaceis, tarsis 
posterioribus piceis: prosterni processu sat elongato et acuminato; coxarum 
processubus rotundato-obtusis. Long. 30, lat 15 m.m. 
Mas, nitidus, elytris versus apicem sat crebre punctatis. 
Fem., subopaca, elytris ad basin paulo ultra medium sulcatis, ad apicem crebre 
punctatis ; prothorace undique crebre punctato. 
The male has the small palettes on the front feet highly developed, while those 
on the middle tarsi are much smaller. 
The species is closely allied to D. marginalis, and has exactly the same appear- 
ance, but it is undoubtedly distinct ; the prosternal process is longer and narrower, 
the coxal processes are more obtuse, and the furrows on the elytra of the female 
are rather shorter. ‘fhe individuals of this species are nearly always somewhat 
smaller than D. marginalis. 
The extent of the black marks on the undersurface is subject to a good deal of 
variation : only suleate females occur, smooth ones being quite unknown. 
Southern Europe, Corsica, Sardinia, Algeria ; (Southern France, Spain, Italy). 942. 
993. Dytiscus persicus, Wehncke, Stet. Ent. Zeit. 1876, p. 52.—Angustulus, 
subtus testaceus, nigro-variegatus ; supra capite thoraceque nigricantibus, hoc limbo 
omni late flavo-marginato, elytris castaneis, late flavo-marginatis ; prosterni processu 
sat lato; coxarum processubus brevibus, obtusis. Long. 29, lat. 14 m.m. 
Mas, \atet. 
Fem , nitida, prothorace subtiliter punctulata, intra marginem impresso ; elytris 
ad apicem crebre punctatis. 
This species seems to be most allied to D. pisanus, but is narrower and more 
parallel, and is peculiar in the colour of the wing-cases, which seem also to be of 
softer texture than usual: as yet the species is known only by smooth females, so 
that in this respect it differs totally from D. pisanus; compared with the female of 
D. pisanus, the punctuation of the thorax is much less, and that on the apical 
portion of the elytra is less regular and scarcely extends so far forwards : the coxal 
processes are quite as short as in D. pisanus, and their apices, just a little less 
