42 Transactions South African Philosophical Society, [vol. xiii. 



The type of the genus, as restricted by Brenske, is T. rotundatus, 

 Casteln., from Senegambia. Until all the numerous species included 

 hitherto into this genus have been revised, it is impossible to say 

 which belong to Trochalus, Ablaberoides, or other kindred genera, 5 " 

 or to obtain an idea of their distribution in Africa, to which 

 continent they are restricted. In South Africa they are widely 

 distributed, several of the species described by Fahraeus as from 

 Natal, or what is now the Transvaal, have been recorded by me from 

 Damaraland and from Ovampoland in the neighbourhood of the 

 Cunene Eiver, but only one species is recorded from the south- 

 western part of the Cape Colony, T. cerugineus, and it ranges from 

 ? Cape Town and Mossel Bay to Natal and the Transvaal. 



Burmeister described six species from South Africa. Although I 

 have not been able to compare, or to have my examples compared 

 with the types, I have identified with tolerable certainty three 

 of these species described again under another name by Fahraeus, 

 and which have therefore priority ; another species is probably the 

 very type of the genus Ablaberoides of Blanchard; the fifth, having 

 a 4-jointed antennal club, may prove to belong to the genus Micro- 

 trochalus, in which case it would be a female and not a male as 

 suggested by Burmeister ; I have not been able to identify the 

 sixth, which I suspect, however, to be identical with another species. 



Key to the Species. 



A 2 . Vertex with a transverse groove running parallel with the base of 

 the head. 



B 2 . Clypeus strongly constricted laterally. 



ft 2 . Anterior tibiae bi-dentate. 



Clypeus tri-dentate in front, and with the lateral margin 

 reaching the outer angle of the reflexed anterior margin. . vagus. 



Clypeus not tri-dentate in front, lateral margin reaching 



the centre of the anterior one damarus. 



ft 1 . Anterior tibiae tri-dentate. 



Clypeus angular in the centre of the anterior margin, 



lateral margin reaching the outer angle chloris. 



* Gerstaeker has described (Gliederthier-Fauna d. Sansibar Gebietes) 3 pecies 

 of Trochalus ; from his descriptions and also from his comparisons, T. ckryso- 

 melinus, which he compares to T. pieipcs, Klug., it having no frontal keel, is not 

 a Trochalus; T. corinthia, which he compares to T. bohemani is most likely 

 a species of Ablaberoides, but he is wrong in ascribing to T. bohemani a transverse 

 impression behind the eyes ; I have now before me the type of this species, and 

 there are no traces whatever of the said impression. T. sulcipennis is plainly 

 a species of Ablaberoides, as proved by the shape of the clypeus. 



