SCOBPIONS OF THE GENUS ISOMETRUS. 445 



with two teeth ; the tooth ou the iaferior edge of the immovable 

 dactylus well developed. 



Legs iu front granular and costate ; tihice of two posterior 

 pairs spurred beneath at apex ; coxce smooth. 



Pectines not extending beyond the extremity of the fourth 

 coxse, furnished with seventeen similar teeth. 



Stigmata slit-like. 



Measurements in millimetres. — Total length 40 ; cephalothorax, 

 length 4'5, width 5 ; tail, length 13'5, of first two segments 5*5, of 

 5th segment 5 ; width of 1st segment 2 "7, of 5th 2 ; vesicle, length 

 2"7, width 1*5. Palp — humerus, length 4 ; brachium, length 4*4, 

 width 1-8 ; manus, wddth 1-4 ; " hand-back," length 2 ; movable 

 dactylus, length 4"6. 



Two specimens, both apparently females, sent by the Univer- 

 sities' Mission from Lake Nyassa, and a third specimen, also a 

 female, taken at Taveita (Kilima Njaro) by Mr. F. J. Jackson. 

 This specimen from Kilima Njaro differs in some slight parti- 

 culars from those collected near Lake Nyassa, which have been 

 described above ; thus the inferior surface of the tail is much 

 more deeply iufuscate ; the inferior keels of the first two caudal 

 segments and the superior keels of the fifth are more strongly 

 developed; the vesicle is more coarsely granular, and there are 

 only fourteen pectinal teeth. 



This species may be recognized by the absence of keels ou the 

 last abdominal sternite. 



ISOMETETJS ASPER, Sp. U. 



Colour deeply infuscate, variegated with fulvous s^Jots and 

 bands ; ocular tubercle black, anteocular region spotted fulvous, 

 lateral and posterior regions of the cephalothorax marked with 

 oblique black and fulvous bands ; the middle of each tergite 

 marked with a black T-shajDed spot, the cross-bar of the T run- 

 ning along the posterior margin ; the rest of the tergites marked 

 with six irregular-shaped, more or less interrupted longitudinal 

 fulvous bands ; two of these bands are situated on the lateral 

 margins and each terminates on the posterior margin in a more 

 conspicuous, subcircular, fulvous spot, so that the posterior 

 margins of the tergites are marked with six yellow spots ; tail 

 variegated throughout, the fulvous tints taking the form of well- 

 defined subcircular spots ; upper surface of humerus and brachium 



