A Survey of the Scorpion Fauna of South Africa. 
147 
(3) Median groove of carapace not forked in front, and the median eyes 
situated far behind the middle of the carapace.^ 
a. Superior terminal lobe of tarsus at least as long as the lateral 
lobes, cylindrical and very thick, being several times as thick as 
the claws at their base, and provided with 6 long stout bristles. 
Anterior surface of humerus very Avide, almost as wide as the 
upper surface in the middle. Pectinal teeth, M. 33, F. 20-21 
O.Jiavescens Pure. 
b. Superior lobe of tarsus slender or short. Anterior surface of humerus 
much narrower than the upper surface in the middle, (a^-b^^.) 
a'. Sides of carapace granular, at least in the anterior half. 
(a3-ci3.) 
a^. Operculum completely cleft longitudinally and provided with 
a pair of stylets on upper surface behind. (Males.) 
a*. Superior crests of canda with enlarged terminal tooth 
in segments II- IT (length of hand-hacJc considerably 
exceeding the breadth of the hand in adult), (a-'-b^) 
a^. Scape of pectines rectangular at the base behind and 
toothed along the whole posterior margin. Anterior caudal 
and posterior abdominal segments II-V or III-V finely and 
densely granular below ...... O. harrooensis Pure. 
b^. Scape of pectines obtuse or rounded at the base behind, the hind 
margin fri-e of teeth for some distance at the base, (a^andb''.) 
a^ All the sternites and lower surface of anterior caudal 
segments densely and coarsely granular . . O. longicauda Pure, 
b^. Sternites and anterior caudal segments inferiorly smooth 
or covered with exceedingly minute scattered granules 
O.gigas Pure. 
b'*. Superior crests of tail with the terminal spines not 
enlarged ; length of hand-bach subequal to, or less 
than, the breadth of the hand in adult. (a''-e^.) 
a^. Sides of carapace coarsely granular only on the anterior half. 
Tail very long, the width of segment I slightly exceeding 
(or subequal to) its length along the upper median line 
O. pattisoni Pure. 
b^. Sides of carapace very coarsely granular as far bach as the 
posterior transverse depressions. Tail stouter and shorter, 
the width of segment I considerably exceeding its length along the 
upper median line, (a^-c^.) 
a^. First caudal segment densely and rather finely granular 
below, the median crests obsolete. Last sternite very 
densely and finely granular. Secondary crests of hand 
obsolete on inner part of the upper surface . . 0. chaperi Sim. 
b^. First caudal segment inferiorly with well developed 
median crests, separated by a groove. Last sternite 
granular throughout, usually more coarsely so at the 
sides, in the middle sometimes rugose or even nearly 
* These characters are undoubtedly secondary. The absence of the fork on the 
carapace may perhaps be regarded in a limited sense as a loss-mutation. 
