Anatomy of the Male Genital Tube in Coleoptera. 519 



JTecfarthrum cylindricwni 



is on a similar plan, but the consolidated basal part of the lateral 



lobes is constricted off from the free portion and forms a distinct 



plate. 



From certain specimens that we have examined it appears probable 

 that the chitinous ejaculatory duct forms a flagellum, and is capable 

 of being thrust right through the tongue at apex, and entirely up 

 the internal sac. 



This type (Passandra and Hectarthrum) differs from the 

 rest of the Cucujidae we have examined in having a large 

 plate on the ventral side of the ring-piece instead of the 

 consolidated tegminal struts {tg). 



Cucujus mniszechi (PI. LVIII fig. 97). 



Median lobe well developed, cylindrical, slightly flattened laterally ; 

 median orifice on dorsal aspect near apex, the ventral edge continued 

 into a small point ; dorsal basal edge continued into large median 

 strut {ms). Tegmen forming slender ring-piece, with small cap- 

 piece, bearing small lateral lobes. Internal sac very long, with long, 

 slender flagellum arising from tlie apex, at the tip of which the 

 ejacuhxtory duct opens. 



Brontopriscus sinuatus (PI. LVIII fig. 100). 



Median lobe small, tubular, with median orifice at tip, the basal 

 part continued as a large flat strut, narrowing in middle and spatulate 

 at the end (a). Tegmen consisting of a ring piece with dorsal cap, 

 the cap being formed by a curved plate produced into two flatfish 

 lateral lobes ; there is no line of division between the plate and 

 the lateral lobes. Internal sac very long, with a long fine flagellum 

 rising from the apex ; about the middle the sac is swollen and its 

 surface studded with fine, short spikes. 



In Brontopriscus pleuralis the aedeagus is very similar, but the 

 flagellum is longer, and there are four broad, short spines on the sac 

 about a third -from its base. 



Brontes hicius is very near to Brontopriscus, but the median strut 

 is longer and more slender ; the middle of the internal sac slightly 

 dilated and covered with long strong hairs and the rest of the sac 

 sparsely covered with stout hairs. 



Diagrypnodes wahefieldi (PI LVIII figs, 99, 99a). 



Median lobe slender, curved and membranous, with a thin chitin- 

 rod on each side to support it ; median orifice on ventral aspect 

 near tip. The tegmen forms on dorsal aspect a large cajj, which is 



