Species of Scorjnons from East Africa. 99 



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 ; 

 Irachium 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 ; coxse smooth. 



Pectines long, projecting beyond the fourth coxa?, 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 6'5, width 6 ; length of humerus 4*5 ; bra- 

 chium, length 5, width 2*2 ; manus, width 3*3 ; length of 

 " 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 Bathas of 

 which hottentotta is a good representative, and appears to lead 

 from it to those constituting the subgenus Prionuras^ of 

 which australis is the type. Thus in the number and arma- 



7* 



