584 Mr. D. Sharpand Mr. F. Muir on the Comparative 
dorsal part extending backwards, bent and slightly flattened. 
Internal sac large, its surface covered with chitinous spines, those in 
the middle being largest and pointed. 
Aphodius senegalensis, 
Differs but little from the foregoing. 
Obs.—If the two Aphodius examined by us are charac- 
teristic of the group, it is distinguished from Coprinae by 
the more flat, less cylindric, base of the tambour. 
Millingenia fossor. 
Median lobe small but well chitinised, without median struts. 
Lateral lobes slightly longer and pointed, embracing the base of the 
median lobe but not entirely concealing it, meeting at their base on 
the dorsal side and connected by a thin strip of chitin on the ventral. 
The basal-piece large but mostly semi-chitinous. Internal sac 
medium size with a thin triangular chitinous plate on the dorsal side 
near base and a strong chitin knob on ventral side near base. This 
appears to be near to Oloeotius. Not correctly placed in Aphodiinae, 
Cloeotus sinuatus (Pl. XLIV figs. 15 and 15a). 
Median lobe small, of a semi-chitinous nature, but quite distinct ; 
median orifice on ventral side near tip. Lateral lobes little longer than 
median lobe, not quite meeting together at their bases, embracing the 
basal-lateral portion of median lobe. Basal-piece very large, forming 
a curved chitinous sclerite on the ventral side, a large membrane (m) 
separating it from the lateral lobes, except at the lateral corners 
where the sclerite is prolonged-to the lateral lobes (a). Internal 
sac very lurge and complex, bearing short hairs, but no chitinous 
armature. 
The fact that the basal-piece forms a sclerite on the ventral side 
of the aedeagus appears to point to a difference between it and the 
Coprinae, but we must recall what we have previously said about 
the dorso-ventral aspect. 
Cloeotus rugiceps. 
Similar to C. sinwatus, but the median lobe is smaller, more 
membranous and more covered by the lateral lobes. Internal sac 
large and complex, bearing hairs that graduate in certain spots into 
short stout spines. 
Cloeotus appears to form a connection between the 
Trogidae, in which the median lobe is well developed and 
