Anatomy of the Male Genital Tube in Coleoptera. 585 
the internal sac small or unspecialised, and the Coprinae> 
in which the median lobe is entirely hidden between the 
lateral lobes, much reduced in size and chitinisation, and 
the internal sac is greatly developed and complex. 
Orphnus sp. 
Appears to come nearer to Inca and Euchirus than to Geotrupes. 
The concealed median lobe is large and membranous, with 
chitinous support at base prolonged into median struts. Lateral 
lobes large, acutely pointed, curved downwards, and straight on the 
inner side, dilated near the tips on the outer side, consolidated at base 
on dorsal and ventral side. Basal-piece large of Melolonthine type, 
the ventral plate being very slightly chitinised. Internal sac large 
with short, stout spines about the middle, 
Orphnus is very different from Coprinae. 
Hybosorus orientalis. 
Closely allied to Phaeochrows. Median lobe as long as lateral 
lobes, visible, well chitinised and asymmetrical ; no median struts. 
Lateral lobes asymmetrical, the right being broad at base and 
bluntly rounded at tip; the left broad at base, the distal three- 
fourths being thin and narrow ; the projection near base on dorsal 
edge forming a small prong ; they do not join at base either on dorsal 
or ventral side. The basal-piece smaller in proportion than in 
Phaeochrous and not forming a tube, the ventral side being mem- 
branous. Internal sac large, studded with short brown chitinous 
spikes with a patch of dark hairs near middle. 
Lnparochrus tumidus. 
Median lobe small and membranous, the chitin forming two 
small supports (median supports) projecting into the “ basal-piece” 
for the attachment of muscles. Lateral lobes large and square 
in shape; meeting at base both on dorsal and ventral sides and 
entirely covering the median lobe. JBasal-piece a long curved 
sclerite on the dorsal side. Internal sac large and complex, but 
without chitinous armature. 
Anuaides laticollis. 
Median lobe small, and membranous except for two small 
supporting sclerites, produced into the basal-piece as two long 
struts for the support of muscles; these are in close connection 
with the base of the lateral lobes. Lateral lobes well developed, 
bluntly pointed and meeting at base on dorsal and ventral 
