598 Mr. D. Sharp and Mr. F. Muir on the Comparative 
very complex and remarkable. Though they are free, they form 
a ring, the transverse diameter of which is broad, the free extremities 
are greatly dilated and one much overlaps the other; moreover 
each is provided at the base with a large free lobe, projecting in 
tongue-like shape. This is a very peculiar aedeagus. 
Cryptodus sp. ? 
Median lobe small, membranous. Lateral lobes large, curved and 
spatulate at tips, meeting together on dorsal side at base, but not 
on ventral side. Basal-piece tambour-shape, with a ventral plate 
consisting of two chitinous sclerites which are consolidated with 
the ventral edges of the base of the lateral lobes. Internal sac 
large bearing a complex chitinous armature near apex, of a 
symmetrical and beautiful shape. 
Lomaptera canthopus (P|. XLVI fig. 27). 
Median lobe well developed but with exceedingly small chitinous 
support and no median struts. Lateral lobes medium size, con- 
solidated to their truncate tips on the ventral side, and at their base 
on the dorsal side. Articulated in a central position on the dorsal 
side of the consolidated lateral lobes is an elastic tongue (a) which 
rises and falls with the evagination and invagination of the internal 
sac. The basal-piece is large and of the tambour type but with the 
basal portion short ; with a ventral plate (vp), rather broad, but not 
very hard, and not consolidated to the lateral lobes. Internal sac large, 
without armature ; the opening of duct being situated at distal end 
on a small prominence, with a small papilla on each side (c). 
In Lomaptera sp.? (small sp. elytra yellow with strong green 
reflections ; not in Brit. Mus. Coll.), the lateral lobes are more 
slender, pointed and turned down ventrally ; the tongue is slender 
and not articulated at its base but forming a continuous piece with 
the lateral lobes. 
Lomaptera sp.? Arfak (chocolate elytra). In this species the 
tongue is broad, and is bifid at the apex. The ventral plate is very 
remarkable, being connected distally with the lateral lobes by a 
large, very hard chitinisation, There is a great deal of hair on the 
ventral aspeet of the lateral lobes. We have this species named L. 
ciocolatina but do not know whether it has been described. It is 
one of the numerous species discovered by the Pratts. 
Ischiopsopha bifascrata. 
Differs very strongly from Lomaptera. The basal part of the 
tambour is still more reduced; there is no chitinisation of the 
ventral plate. The lateral lobes form a slender ring with a small 
