British Species o/IIaliplus. 123 



(17) Seidlitz, G. 1886. Bestimmungs Tabella clu Dytiscidss u. 



Gyrinidie des Europaischen Faunengebietes. Yerhandl. d. 

 Natiirf. Vereines in Jiriiun, Bd. xxv. 



(18) Sharp, D. 18G9. Notes on British Hydradepbaga ; witb Descrip- 



tions of new Species of Haliplus and Hydroporus. Ent. Mo. Mag. 

 vi. 81. 



(19) . 1912. The Comparative Anatomy of the Male Genital Tube 



iu Coleoptera. Trans. Ent. Soc. London, pp. 477-642. 



(20) . 1913. Description of a new Species ot Haliplus {H. broicne- 



aniis). Ent. Mo. Mag. (ser. 2) xxiv. pp. 75, 76, & 108. 



(21) Thomson, C. G. 1867. Skand. Coleopt. x. 293. 



(22) ^^'KHXCKE, E. 1880. Uebersicbt der Europaiscben Verwandten 



des Haliplus ruficoUis, De G. Deutsche Ent. Zeit. xxiv. p. 223. 



(23) Zaitzkv, P. 1906,7. Haliplidse, Dytiscidae, &c, du Gouv. de 



St. Petersbourg. Extr. de I'anuuaire du Musee Zool. de I'Acad. 

 Imper. des Sci. de St. P6tersb. i., xi., & xii. 



EXPL.'^^ATION OF THE PLATES. 

 Plate VII. 



Fig. 1. Left side of sedeagus of Haliplus apicalis, Thomson {striatus, 

 Sharji). Drawing made from an Irish specimen. 



Ditto of //. fluiiatilis, Aube. 



Ditto of H. wehnckei, Gerhardt. 



Ditto of H. rujicollis, De Geer. 



Ditto of H. noma.r, mibi. 

 f?. Right side of tedeagus of same species to show the " hood." 



Left side of oedeagus of H. heydeni, Wehncke. 



Ditto of H. immaculatns, Gerhardt. 



Ditto of H.fulvicollis, Erichson. 



Ditto of H.fu)catus, Seidlitz. 



« = main lobe; 6= the tongue, whicb iu figs. 1, 2, and 8 is 

 wholly or partially tbiu-walled, possibly somewhat expansible ; 

 b' = depression in main lobe in which " tongue" lies (in tig. 6 the 

 tongue is shown slightly out of position) ; c^the "hood"; 

 (/=the "saccular" region, witliiu some cases a free lobe or 

 "wing," d' ; e = the thin wall of the ductus ejaculatorius ; ff = 

 the groove on the " tongue " which continues on to the main 

 lobe, y'. 

 Fig. 10. Prosternum (P), part of metasternum (il/), and coxae with tro- 

 chanters of first and second pairs of legs of H.furcatus, Seidl., 

 to show the channelling of the prosternum and the twin 

 depressions (a a) in the metasternum. 



Plate VIII. 



Fiy. 1. Left accessory lobe (external or periphallic lobe or paramere) of 

 Haliplus apicalis, Thomson (striatus, Sharp). Drawing made 

 from an Irish specimen. View of inner side, t. e. the side 

 which lies against the eedeagus. 



Fiys. 2, 2 a. Ditto of H.Jluviatilis, Aube. Inner and outer sides. 



Fiy. 3. Ditto of H. nomax, mihi. Outer side. 



Fig. 4. Ditto of H. tvelmcJ^ei, Gerhardt. Outer side. 



Fiy. 5. Ditto of ^. ruficoUis, De. Geer. Outer side. 



Fiy. 6. Ditto of H. heydeni, Wehncke. Outer side. 



Fig. 7. Ditto of H. immaculatus, Gerhardt. Outer side. 



