176 Annals of the South African Mime inn. 



b 6 . Ventral surface of abdominal and anterior caudal 

 segments smooth or covered with exceedingly minute 

 scattered granules. Bushmanland (Cape Colony), 

 German South-West Africa . . 3 O. gigas, Pure. 



b 4 . Superior crests of cauda with the terminal spine not 

 enlarged. Length of hand-back sub-equal to. or less than 

 the breadth of hand in adult. 



a 7 . Sides of carapace coarsely granular only on the anterior 

 half. Tail very long, the width of segment 1 slightly 

 exceeding (sub-equal to) its length along the upper 



median line. Clanwilliam Division 



cf O. pattisoni, n. sp. 



li~. Sides of carapace very coarsely granular as far back as 

 the posterior transverse depressions. Tail stouter and 

 shorter, the width of segment 1 considerably exceeding 

 its length along the upper median line. 



a 8 . First caudal segment densely and rather finely 

 granular below, the median crests obsolete. Secondary 

 crests of hands obsolete on inner part of the upper 

 surface. Robertson and Worcester Divisions . . 



$ 0. cliaperi, Sim. 



b 8 . First caudal segment with well-developed median 

 crests, separated by a groove. Secondary crests of 

 hands distinctly raised. Tulbagh and Worcester 

 Divisions <? O. fossor, Pure. 



b 3 . Operculum fused to a single piece along median line, without 

 stylets. (Females.) 



a?. Superior crests of cauda with enlarged terminal tooth in 

 segments 2-4. Breadth of hand 1-li times the length of 

 hand-back in the adult, the upper surface almost smooth. 



a 10 . Hands flattened above. Scape of pectines free of teeth 

 at base behind for about two-sevenths of its length. 

 Tail shorter, the length of segment 2 along upper median 

 line sub-equal to its width . . ? O. harroocnsis, Pure. 



6 1 ". Hands convex above. Scape of pectines free of teeth at 

 base behind for about one-third of its length. Tail 

 longer, the length of segment 2 along upper median line 

 at least one-fourth longer than the width. 



a' 1 . Anterior caudal segments granular below 



? 0. longicauda, n. sp. 



6". Anterior caudal segments smooth below 



? 0. gigas, Pure. 



b 9 . Superior crests of cauda with the terminal tooth not enlarged. 

 Breadth of hand l-2 times the length of hand-back in the 

 adult, the upper surface covered with low, broad, anasto- 

 mosing tubercles. 



