On Aquatic Carnivorous Coleoptera or Dytiscidce. 645 



The palettes of the male tarsi are moderately developed, and show no 

 difference from what exists in D. circumcinctus. The species is nearly always of 

 more slender form and of a greener colour than the other allies of I )ytiscus margin- 

 alis, and is readily identified by the great elongation of the coxal processes. It 

 varies a good deal in colour, size and width ; the specimens from the northern part 

 of its area of distribution being generally broader and of a less green colour than 

 most of the individuals which are found in southern Spain and Algeria ; in the 

 sulcate female of the larger variety the grooves are generally continued rather 

 nearer to the extremity of the wing-cases. In the north it would seem that sulcate 

 females are more abundant than sniooih ones, while in the south the reverse is 

 the case. 



Central and Southern Europe ; apparently most common in the neighbourhood of the Mediterranean 

 Sea Corsica, Algeria ; (England, France, Germany, Spain, Corfu, Hungaiy). 950. 



1002. Dytiscus lapponicus, Gyll., M.C — Subtus testaceus, abdominis lateribus 

 nigro-maculatis, supra piceus, prothorace limbo omni late flavo-marginato, scutello 

 ffavescente, elytris lateribus lineisque tenuibus flavis ; antennis pedibusque testaceis ; 

 prosterni j^rocessu brevi ; coxarum processubus apicibus distantibus, subito angus- 

 tatis, elongatis et acumiuatis. Long. 27, lat. 13^ m.m. 



Mas, nitidus, elytris ad apicem fortiter punctatis. 



Fern, (a), opaca, elytris ad basin ultra medium sulcatis, ad apicem fortiter 

 crebrius punctatis ; prothorace undique creberrime punctato. 



(6), nitida, prothorace subopaca, prsesertim in medio crebrius subtiliusque 

 punctato, elytris ad apicem fortiter punctatis. 



The male has the small palettes of the tarsi moderately developed. 



The species has the outline of the thorax and elytra more discontinuous than in 

 any other species, the tliorax being narrower than usual especially at the base ; the 

 eyes are always largely bordered with yellow : the contraction of the coxal processes 

 takes place on their inner edge just below the coxal notch : the anterior border of 

 the hind coxa approaches nearer to the middle coxa than in any other species, and 

 the terminal portion of the epipleurse is a little broader than in the other species of 

 the D. marginalis group. Thes3 characters allov^• the species to be easily recognized, 

 although it is a very variable one in size and colour. The yellow irregular lines 

 on the elytra can sometimes scarcely be detected ; at other times the yellow colour 

 is more than usually predominant, and the black mark on the middle of the thorax 

 may even be broken up : very rarely the elytra are of a greenish oHvaceus o;.- rather 

 of a piceous colour. The specimens from Northern Germany are larger and darker 

 than any others I have seen. 



I am not quite certain that the individual, the only one I have seen, from Siberia 



4 0.' 



