148 
Transactions of the Royal Society of South Africa. 
smooth. Secondary crests of hands distinctly raised. 
Legs dark red-brown O.fossor Pure. 
c^. Near to foosor, but legs are yellow or yellowish red, and 
secondary crests of upper surface of hands are only 
represented at the base of the finger. Last sternite 
smooth or almost smooth in the middle . . O. infermedius Kraep. 
b'^ Operculum fused along the median line to a single piecCy 
without sti/lets. {Females). 
a'. Superior crests of cauda with enlarged terminal tooth in segments 
II-IV. Breadth of hand times the length of the hand-hack 
in the adult, the upper surface almost smooth, (a -b'^) 
a^". Hands flattened above. Scape of pectines free of teeth 
at base behind for about f of its length. Tail shorter, 
the length of segment II along upper median line being 
subequal to its width. Sternites smooth except the 
last, which is weakly granular posteriorly or sometimes 
nearly smooth ; first caudal segment densely granular 
below or sometimes almost smooth, or very weakly 
granular mesially behind .... 0. karrooensis Pure. 
b'*^. Rands convex above. Scape of pectines free of teeth at 
base behind for about I of its length. Tail longer, the 
length of segment II along upper median line at least 
^ longer than the width, (a^^ and b^i.) 
a'^. Anterior caudal segments granular below 0. longicauda Pure, 
b^'. Anterior caudal segments smooth below . . O.gigas Turc. 
Superior crests (f cauda with the terminal tooth ?iot enlarged. 
Breadth of hand lf-2 times the length of the hand-back in the 
adult, the upper surface covered with lotv broad anastomosing 
tubercles, (a^^-c^'). 
a}^. Sides of carapace coarsely granular only in the anterior 
half. Tail long, the width of segment I subequal to its 
length along upper median line 0. pattisoni Pure. 
b'2. Sides of carapace very coarsely granular as far back as the 
posterior transverse depressions. Tail stouter and shorter, 
the toidth of segment I mtich exceeding its length along the 
upper median line. (a^-^-C^^.) 
a^^. Inferior median keels obsolete in caudal segment I. 
Secondary crests on inner part of upper surface of 
hand obsolete, indicated only by black lines. Last 
sternite smooth in the middle or just perceptibly 
rugoso-granular ....... O. chaperi Sim. 
b^^. Inferior median keels of caudal segment I well de- 
veloped, separated by a distinct groove. Secondary 
keels of hands distinctly raised. Last sternite smooth 
in the middle or with a few of the minutest granules . O.fossor Pure. 
c^^ Near to fossor, but see O. intermedins Kraep. 
b^. Sides of carapace finely granular, the granules near the lateral 
borders of the interocular area not much coarser than those else- 
where, (a'^-b'*^.) 
