‘Anatomy of the Male Genital Tube in Coleoptera, 519 
Hectarthrum cylindricum 
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 (#9). 
Cucujus mniszechi (Pl. LVITI 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 laterallobes. Internal sac very long, with long, 
slender flagellum arising from the apex, at the tip of which the 
ejaculatory duct opens. 
Brontopriscus sinuatus (Pl. LVIII fig. 100). 
Median lobe small, tubular, with median orifice at tip, the basal 
part continued asa 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 flattish 
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 plewralis 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 lucius 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 wakefieldi (Pl. LVIIT 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 cap, which is 
