1907.] Catalogue of the Coleoptera of South Africa. 373 



median part to the outer basal angle which covers part of the some- 

 what narrowed and vertical mesothoracic epimera, base very slightly 

 arcuate ; the surface is nearly plane ; in the 5 the prothorax is 

 broader than long, more ampliate rounded laterally and thus leaving 

 the mesothoracic epimera uncovered, the base is slightly bi-sinuate ; 

 scutellum very long and very sharp ; elytra sub-parallel in the $ , 

 plane and as broad as long in both sexes, but more ampliated behind 

 in the ? ; pygidium vertical ; legs slender with the tarsi as long as 

 the tibiae in the $ , slightly shorter in the ? ; anterior tibiae bi-dentate 

 outwardly in the $ with sometimes a small trace of a third upper 

 tooth, tri-dentate in the $ ; in that sex the terminal part of the hind 

 tibiae is dilated, and the upper hind spur is broadly spatulate, while 

 in the $ that terminal part is somewhat slender and the two spurs 

 are long and sharp ; mesosternum with a small process between the 

 coxae, this process is sub-vertical (I. rostrata) or sloping and not 

 well denned (I. cuspidata, I. nasuta). 



It seems that the insects included in this genus live on fresh 

 excrements of herbivorous animals. They are, however, found also 

 on trees in flower. Female examples are very rare, and that they 

 are powerful burrowers is proven by their spatuliform hind spurs. 

 I am of opinion that in the larval stage some live in the detritus 

 heaps of termitaria. The synonymy of the described species of this 

 singular genus, which does not seem to have any ally outside the 

 South African Sub-Kegion, is very complicated. Three undoubtedly 

 different species are known to me, and one described by Burmeister 

 would appear also to be a valid one. 



Key to the Species (3 $ ). 



A 2 . Clypeus much longer than the head ; antennal club very 

 long. 



B 2 . Black, with the prothorax and elytra marginated with 

 white. 



Antennal club very much longer than the pedicel ; 

 clypeus deeply bi-incised laterally at base, acuminate 

 and truncate at apex ; two white patches on the 

 pygidium cuspidata. 



Antennal club not much longer than the pedicel, 

 clypeus parallel for two-thirds of the length, incised 

 there and contracted thence into a peduncle expand- 

 ing at apex into a strongly hamate projection on each 

 side ; no white patches on the pygidium rostrata. 



B'. Black, with the elytra pale testaceous. 



