Anatomy of the Male Genital Tube in Coleoptera. 599 
notch in the tip at the middle, and there is no tongue. The 
absence of chitinisation on the ventral aspect appears in this form 
to be complete ; and the approximation to Cyclocephala stictica to be 
incontrovertible. 
Diaphonia dorsalis. 
The tambour is pretty much of the usual tambour-shape, the 
basal part being moderately large. The lateral lobes form two free, 
pointed tusks, and at’ the base between them there is a large, 
grooved, triangular process which is strongly chitinised. The 
chitinisation of the ventral plate is very feeble. 
Macronota diardi and M. suturalis. 
In these two species although the wall of the body is very hard, this 
is not the case with the aedeagus. The tambour is but little basket- 
like, and the chitinisation throughout allows the harder parts to be 
somewhat elastic. 
In M, sutwralis the tambour is remarkably flat, and is not broader 
at its front. The lateral lobes are short, broad and pointed, and can 
be brought together in the median line, then forming a roof without 
special orifice for the protrusion of the median lobe. 
In M. diardi the tambour is greatly expanded in front, so that its 
angles descend and are very acute: only the lateral and anterior 
margins are strongly chitinised, the rest of the surface being feeble 
and transparent. The lateral lobes are large and complex, each 
terminating as a spinose process directed outwards, while near the 
base of each there is a smaller, hooked spine. The position of the 
two lobes is much the same as in M. sutwralis, In both species the 
median lobe appears to be less developed than usual: but both the 
examples are in a very decayed state. 
Cetonia aurata (Pl. XLVII fig. 28). 
Tambour elongate but not highly developed, the basal part as long 
as the distal. Chitinisation of the ventral aspect poor and irregular, 
there being several patches of inferior chitinisation. The lateral lobes 
large but not quite so long as the basal-piece. They are placed dorsally 
with their median margins parallel, but not quite contiguous ; they 
are consolidated for more than half their length, the apical portions 
being free; the deflexed tips bear each a small process abruptly 
turned outwards, 
Inca pulverulentus. 
Median lobe and internal sac not examined. Lateral lobe large, 
curved downwards, flattened and spatulate at tips; consolidated at 
