13 r'it ifh Sj>ecies 0/ lls\\\[)\i\3. 12.) 



(17) Seidlitz, (f. 1880. Hestiinmiinj^s Tnbella du DytiscMaj 11. 

 (• vriiiidii! (les JOuropaiyclien FtiuiiL'Ujj'ebictes. Verhuiidl, d. 

 Natuif. N'lToiiu's in liriiuii, Jkl. xxv. 



(^18) JSiiAHi', I). iHil). Notes uii British II vdradepliaga; with Descrip- 

 tions of new Species of Jlulip/i/suud llydrupui ns. Knt. Mo. Ma", 

 vi. 81. 



1 9) . 1012. The Comparative Anatomy of the Male Genital Tube 



in ('iileoptera. Trans. Eiit. 80c. London, pp. 477-(J42. 



(lo) . lUKJ. Description of a new Specii-3 oi Jlulijtlus [JI. broiv/ie- 



<iiii(i<). Ent. Mo. Maj;;'. (ser. 'J) x.\iv. })p. 7o, 70, A; 1U8. 



(21 ) TuuMso.v, (J. G. 18(37. Skand. L'oleopt. x. 203. 



(22) \\ KiixcKK, E. 1880. Uebersicht der Europaischen Vcrwandten 



d'-s Il'fliplus nijicollis, De G. Deutsche Ent. Zeit. xxiv. p. 2^0, 



(23) Zmt/.kv, i*. lUOU, 7. llaliplida?, Dytiscidas, ^:c. du Gouv. de 



St. IVlersbouv}''. Extr. do I'aiuuiaire du Musee Zool. de I'Acad. 

 Iiupi5r. des Sci. de St. P6tersb. i., xi., & xii. 



EXl'LANATIUX UF THE PLATES. 

 Plate VII. 



Fii/. 1. Left side of nedeagus of Ilaliplus apicalis, Thomson [striutus, 

 Siiaip). Drawing made from an Irish specimen, 



Fi(f. 2. Ditto of //. ////rjVz/i//^, Aube. 



I'ifj. i{. Ditt ) of ][. wehnchei, Gerliardt. 



Fig. 4. Ditto of 11. nijicollis, De Geer. 



Fii/. 5. Ditto of 7/. wowjri.r, mihi. 



Fii/. ii 11. IJight side of a-deagus of same species to show the " hood."' 



l-'i(/. 0. Left side of rodeagus of II. Jieijcletii, Wehncke. 



Fiij. 7. Ditto of 7/. ?;«m«c//A</Ms, Gerhardt. 



Iiij. 8. Ditto of i/./«/i/cu///«-, Erichson. 



Fiij. y. l)itt(i of 7i./«?tW MS, Seidlitz. 



«=:niain lohe ; 6=the tongue, whicli in figs. 1, 2, and 8 is 

 wliolly or p.iilially thin-walled, possibly somewhat expansible ; 

 i' = depression in main lobe in which " tongue "lies (in tig. U the 

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

 rf=the ".<»accular" region, with in some cases a free lobe or 

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

 the groove on the " tongue " w hich continues on to the main 

 lobe, fj'. 



Fii/. 10. Prosternum (7*), part of metasternum (.17), and cox;e with tro- 

 chanters of first and second pairs of legs of Jl.furcntii.^, Seidl., 

 to show the channelling of the prosternum and the twin 

 depressions (a a) in the metasternum. 



Pl.VTE VIII. 



Fig. 1. Left accessory lobe (external or peripliallic lobe or paramere) of 

 I[alii<liiii (ipicitlin, Thomson (.ifiintus, Sharp). Drawing made 

 frciui an Irish specimen. View of inner side, i. <?. the side 

 which lies agftin>t the a^deagus. 



7»y.s. 2, 2 a. Ditto of 11. jluvinlilis, Aub^. Inner and outer sides. 



Fiy. •'{. Ditto of 77. nomdx, milii. Outer side. 



Fig. 4. Ditto of //. frf7i«r/.<'/. (Jerhardt. Outer side. 



Fig. 5. Ditto of 77. /•M//t«///x. De Geer. Outer side. 



Fig. (5. Ditto of 77. /«7/</«'«j', W'ehnrke. Outer side. 



Fig. 7. Ditto of 7f. mmrtCM/«^«5, Gerhardt. Outer side. 



