646 On Aqiuitic Carnivorous Coleoptera or Dytiscidrp. 



really belongs to this species ; it is very narro^v, and has the coxal processes shorter 

 and the epipleura3 narrower than any other specimen I have seen. 



Northern Em-ope aud Siberia : extending southwards in the mountains to the Basses Alpes, aud 

 Korthem Italy, but othenvise not found more to the South than Northern Germany and Central Russia. 

 (Lapland, Scotland, Ireland, Stettin, Berlin. Kasan : Barcelonette ; Lago della Madtlalena.) 951. 



Group 3. 



1003. Dytiscus latissimus, Liun., M.C. — Subtus ferrugineus, supra niger, protho- 

 race liiubo oiuni elytrisque flavo-marginatis, antennis pedibusque rufis, tarsis 

 posterioribus plus minusve picesceutibus ; epipleuris dilatatis ; prosterni processu lato 

 et brevi ; coxarum processubus apicibus distantibus, acuminatis, parum prolongatis : 

 labro medio vix emarginato. Long. 40, lat. 25 m.m. 



Mas, sat nitidus, elytris apicem versus tantum subtilius punctulatis. 



Fern., subopaca, prothorace medio utrinque subtilissime punctulatu, elytris louge 

 ultra medium sulcatis, iuterstitiis dense subtilissime punctatis, apice crebre sub- 

 tiliter punctatis, punctisque majoribus parum numerosis. 



In the male of this species the small palettes of the front tarsi remain unde- 

 veloped, being no larger than those of the intermediate feet. The species is re- 

 markable by the dilated epipleurse with a sharp external edge, and by the fine 

 punctuation of the sulcate female ; the yellow band at the apex is divided into two 

 narrow widely separated portions, the anterioi of which is unusually distinct. 

 The species varies but little, but sometimes there is a more or less extensive 

 appearance of yellow colour on the middle of the wing-cases in the female : notwith- 

 standing the large size of the species, the hind femora are remarkably slendei'. 

 The species is extremely liable to abnormal developments of different parts of the 

 skeleton. An individual possibly a hybrid between this and D. marginalis, or D. 

 dimidiatus has been described by Kraatz, Berl. Ent. Zeit. XVIII, p. 293, pi. I, 

 f. 2, but as the description and figure quite agree with D. harrisii, I am inclined to 

 believe that the supposed hybrid may prove to be an individual of that species. 



Northern Europe ; (and N. America 1). (Sweden ; Finland to 63°, sec. Sahlberg; Germany : Vosges). 952. 



Group 4. 



1004. Dytiscus harrisi, Kirb , M.C. — Latus, robustus ; subtus testaceo nigroque 

 variegatus, supra niger, prothorace limbo omni elytrisque flavo-marginatis, antennis 

 piceo rufis, femoribus testaceis, tibiis et tarsis pedorum quatuor posteriorum nigri- 

 cantibus ; prosterni procesu brevi et lato ; coxarum processubus brevibus, rotundatis ; 

 labro baud emarginato. Long. 40, lat. 22 m.m. 



