Anatomy of the Male Genital Tvhc in CoUoptera. 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 Euchirns 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 cbitinised. Internal sac large 

 with short, stout spines about the middle. 



Orphnus is very different from Coprinae. 



Hyhosorns orientalis. 



Closely allied to Phaeochrovs. 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 

 Phaeuchrous 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. 



Liparochrus timidus. 



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. Basal-piece a long curved 

 sclerite on the dorsal side. Internal sac large and complex, but 

 without chitinous armature. 



Anaides 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 



