138 Annals of the South African Museum. 



which differ from the pallidipcs group only in the absence of the 

 forked groove. All are karroo -forms, and include karrooensis in- 

 habiting Eobertson, Prince Albert, Beaufort West, Victoria West, 

 and probably also some of the adjoining Divisions, and two forms 

 from Bushmanland, viz., gigas and longicauda. 



0. austerus, which does not appear to be closely related to any 

 other species, has been recorded from the eastern high-lying part of 

 the Worcester Division, and from Sutherland. 



A large group of mostly dark-coloured species, characterised by 

 the superior caudal crests not ending in an enlarged tooth, occupy 

 the southern and eastern part of Cape Colony, Natal, the Eepublics, 

 and Rhodesia. This group runs into two series connected by 0. 

 macer, viz., (a) forms with the sides of the carapace coarsely granular : * 

 chaperi (Langeberg Range in Robertson and Worcester Divisions), 

 fossor (western part of Worcester Division and greater part of 

 Tulbagh Division), and pattisoni (Cedarbergen in Clanwilliam 

 Division) ; (b) forms with the sides of the carpace finely granular : t 

 macer extending along the South- West Coast from False Bay to 

 Zululand and northwards as far as Ceres, latimanus from Albany 

 Division, pugnax from Transvaal (also Natal and eastern part of 

 Cape Colony, teste Pocock), glabrifrons from north-east of Cape 

 Colony, Transvaal, and Rhodesia. This group, although as large 

 as the granifrons group, is much more homogeneous. The fourth 

 tarsus has 4 spines on the external lobe and 1-3 (rarely none) 

 external spines on the under side as well. The pectines are 

 rectangular at the base behind in the male. The last segment of 

 the abdominal sterna is often smooth in the middle and granular 

 laterally. 



0. crassimanus from Bushmanland is evidently closely related to 

 granifrons, with which I have grouped it above in spite of the 

 absence of a forked median groove. 



0. wahlbergi from Bushmanland and German South- West Africa 

 and 0. flavesccns from the latter territory are, as regards their affini- 

 ties, apparently isolated forms. 



I wish here to express my obligations to Dr. J. W. B. Gunning, 

 Director of the Staats Museum at Pretoria, for having placed the 

 valuable collection of Transvaal scorpions of his Museum at my 

 disposal for examination. This collection proved of great service in 

 the elucidation of certain points in connection with 0. pugnax and 

 O. glabrifrons. 



* Including also 0. intermcdiiis, Kraep. (locality unknown). 

 t Including also 0. brcviccps, Poc. (locality unknown). 



