COLEOPTERA. DYTICID^,. 



95 



The first family Dyticidte * Leach (Eunechina K. and S.^ corre- 

 sponding with the Linnaean genus Dytiscusf, is distinguished from 

 the other families of Water-beetles by the antennae, which are long 

 and slender :j: (^fig. 5. l. Acilius sulcatus, divided down the centre by a 

 line to show the peculiarities of the sexes), and by the articulated 



F/g. 5. 



external lobe of the maxillae (Jiff. 5. 4.). They are of an oval, elliptic, 

 or rounded form ; of a very firm consistence ; the head large and broad, 



• . * BiBLioGR. References to the DyTiciDiE. 



■ I l< J.CL 



Leach, in Zool. JbfeHi. v. 3. 



Clairville, Entomol. Helvct. vol. i. 



Ahrens, in Act. Soc. Nat. Scrut. Halens, vol. i. 



Kunze, in ditto, vol. ii. Ditto, Entomol. Fragmente (Descriptions of several nearly 

 allied Species of Hydroporus). 



Sturm. Deutchst. Fauna, vols. viii. and ix. 



Erichson. Genera Dyticcorum. Berol. 1832. 8vo. And Kafer der Mark Bran- 

 denburg. 



Laporte. Etud. Entomol. vol. ii. 



Audouin and Brulle. Hist. Nat. Ins. vol. v. 



Say, in American Phil. Trans, new series, vols. ii. and iv. 



Stephens. Illustr. Mand. vols. ii. and v. Suppl. 



Dejean and Auht. Colcopt. d'Europe. 



King. Symbola; PhysicK, and Descript. Colcopt. Madagascar. 



And the general works oi Fahricius, Olivier, Gyllenhall, Stephens, Duftschmidt,G cr- 

 mar (Ins. Sp. Nov.), Marsham, &c. 



And for additional notices of habits, Disderi, in Trans. Turin Academy, vol. iii. 

 DeGeer, vol. iv. Rosel, Abhandl. &c. vol.ii. Lyonnet, Posthum. Memoirs, 

 vol. i. Goeze, in Der Naturforscher, Stuck 7. And the Journal of a Naturalist, 

 vol. i. Clairville, Ent. Helvet. 



f The incorrect Linnasan name, Dytiscus (derived from Ayrixo'-, urinatorius), has 

 been rejected by most of our entomologists in favour of GeoflVoy's name, Dyticus. 

 \ The genera Agabus and Laccophilus offer partial exceptions to this character. 



