134 Annals of the South African Museum. 



consequent numerical preponderance, a fair range of variation is only 

 to be expected ; hence the name Ctenolophus was applied to what is 

 most probably only a section (confined perhaps to South Africa) of 

 the genus, whilst the original erroneous formation of the genus 

 Acanthodon was responsible for much confusion and cross identifica- 

 tion. Finally Gorgyrella can also be regarded as an offshoot from 

 form (A), and is important in that it lends support to the theory of 

 the South African origin of the Idiopeae in that it is found in South 

 Africa alone ; whilst in the resemblance of its young to the adult 

 forms of Segreyara, it indicates a former connection therewith. 

 Heligomerus, the other representative of the group, diverged on the 

 same lines as Idiops, and is found in Tropical Africa, Ceylon, and 

 India, but evidently did not succeed in establishing itself as did 

 Idiops. 



The occurrence also of the genus Diplothele (p. 118) in Africa, as 

 well as Madagascar and India, is interesting, since the group is akin 

 to the Idiopeae in eye formation, and to Segregara in sternal sigilla, 

 and may eventually prove to be connected with the group in origin, in 

 Tropical Africa. 



It follows then that the species placed under Acanthodon in Hewitt's 

 table (Ann. Transv. Mus. vol. 5, No. 3, p. 87) will have to be sepa- 

 rated as follows : 



A. spiricola, kolbei, and kentanicus come under Idiops, sect/oii one 

 row of teeth on inner side only of cheliceral groove, and formerly 

 known as Ctenolophus. A. namaquensis and A. schreineri are as 

 Purcell named them, Gorgyrella namaquensis and schreineri. 



A. abrahami and A. transvaalensis become Segregara abrahami and 

 trans vaalensis, as apparently do monticola and grandis also ; for the 

 others an examination of the specimens is necessary to decide under 

 which genus they should be placed. 



SEGREGARA TRANSVAALENSIS (Ht.). 



Specimens. A subadult $ (No. 150,502) from Warmbaths, Trans- 

 vaal, collected by Dr. W. F. Purcell, 9/05. The specimen differs very 

 slightly from the description of transvaalensis in the number and 

 arrangement of the spines, and is smaller in size ; the sternal sigilla, 

 however, though faint in appeai'ance, are as in form (A) and are 

 characteristic of Segregara. 



SEGREGARA ABRAHAMI (Ht.). 



Specimens.- -One ? (No. B 78) from Burghersdorp, Albert Div., 

 collected by Dr. Kannemeyer, 10/07. This example is smaller than 



