99 
Species of Scorpions from East Africa. 
granular at the sides, bearing four keels, the internal keels 
smooth, abbreviated in front, complete behind, the external 
granular and abbreviated in front and behind. 
Tail powerful, parallel-sided, deeply excavated above; the 
anterior four segments furnished with ten granular keels, but 
the median lateral (supernumerary) keel becoming weaker 
posteriorly, is nearly obsolete on the fourth segment ; the rest 
of the keels on these segments all well developed, complete 
and evenly granular throughout, the posterior granule only of 
the superior keels being the largest of the series and denti- 
form ; the intercarinal spaces finely and closely granular ; the 
upper surface of the first and second segments granular, the 
upper surface of the rest smooth ; fifth segment excavated 
and smooth above, with compressed granular sides, the infe- 
rior lateral and median keels evenly granular throughout, the 
space between these keels coarsely and finely granular, the 
granules in the anterior half being arranged on each side in a 
distinct longitudinal series. Vesicle large and inflated, gran- 
ular and hairy below ; aculeus of average form. 
Palpi . — Humerus thickly granular above, granular and 
tubercular in front, minutely granular beneath, hairy, espe- 
cially in front, and furnished with the usual granular keels ; 
brachium granular and granularly costate above, smooth and 
subcostate behind and beneath, granular and granularly 
costate in front ; manus large, rounded, very finely and closely 
granular, hairy and somewhat deeply punctured, much wider 
than the brachium ; dactyli short, not in contact at the base, 
each furnished with a lobe, the lobe on the movable dactylus 
being smaller than and fitting behind the lobe on the immov- 
able dactylus. 
Legs granular and carinate ; coxae smooth. 
Peclines long, projecting beyond the fourth coxae, furnished 
with 25 or 26 similar teeth. 
Measurements in millimetres . — Total length 50 ; length of 
tail 30, of first segment 3, of second 4, of third 4*2, of fourth 
5, of fifth 6, of vesicle 3*5 ; width of first segment 4, of third 
4*2, of fifth (in front) 4, (behind) 3, of vesicle 3 ; cephalo- 
thorax, length 5*5, width 6 ; length of humerus 4*5 ; bra- 
chium, length 5, width 2*2 ; manus, width 3*3 ; length of 
u hand-back ^ 4, of movable dactylus 5*7. 
A single male specimen taken on the south shore of Victoria 
Nyanza. 
This interesting species belongs to the group of Buthus of 
which hottentotta is a good representative, and appears to lead 
from it to those constituting the subgenus Prionurus , of 
which australis is the type. Thus in the number and arma- 
