Anatomy of the Male Genital Tube in Coleoptera. 489 
Blethisa multipunctata. 
The aedeagus of this species is remarkable by the small area 
of the median lobe that is chitinised, the larger part of the lobe 
being membranous. This species has also a very peculiar feature, 
inasmuch as a long strut extends forwards. This strut appears to 
be a process of the internal sac, and has nothing in common with 
the strut of Dytiscidae that at first sight appears to be similarly 
placed. It is unfortunately too late to add a drawing of this 
interesting structure to our plates. 
Mormolyce phyllodes (Pl. XLVI figs. 33 and 33a). 
Median lobe very short, stout, and funnel shaped ; median orifice 
large, across distal end, the edge of left side being drawn out 
into a narrow tongue; median foramen large, across base of lobe, 
with lateral lobes attached to edge on dorsal side. Left lateral 
lobe small and flattened, right lobe double the size of left. Internal 
sac when evaginated twice as long as median lobe, with blunt short 
diverticula near apex and the apical part granulated. It is possible 
that the sac as figured is not entirely evaginated near apex. 
In this paradoxical insect, the articulation between the lateral 
lobes and the median seems to be imperfect, but our preparation is 
from an immature example. 
Pheropsophus agnatus (Pl. XLVIII fig. 35). 
Median lobe short, pointed ; median orifice occupying median 
portion on ventral side of lobe ; median foramen basal. Lateral lobes 
small, irregular and sub-equal. Internal sac large, with blunt, short 
diverticula near base and on ventral side. 
Anthia sexqguttata. 
Median lobe forming an irregular tube, abruptly bent up dorsally 
near base ; median orifice a narrow slip along one-fourth of tube on 
ventral side near apex, continuing as a depression to near bend at 
base ; median foramen at basal end. Lateral lobes small, thick and 
irregular, right larger than left. 
Teffius difficilis. 
Very solid tubular median lobe, somewhat asymmetrical, with 
short thick lateral lobes attached to its dorsal basal point, the 
right lateral lobe larger than the left; median orifice at distal 
end, median foramen at basal end, slightly dorsal. Internal sac 
large, complex, covered with chitinous granulations. 
