Anatomy of the Male Genital Tuhe in Coleo2}tera. 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. 



Diaplio'i } ia 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. 



Macroiwta dianli and M. svturaUs. 



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. suturalis the tambour is remarkably flat, and is not broader 

 at its fi'ont. 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 iirotrusion 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. suturalis. In both species the 

 median lobe appears to be less developed than usual : but both the 

 examples are in a very decayed state. 



Cetonia anrata (PI. 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 detlexed 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 



