89 



Tergites granular throughout, more coarsely behind than in front, 

 with a single median keel. 



Sternites; the first three entirely smooth, the fourth very feebly 

 granular laterally, the fifth finely granular throughout, except in the 

 middle in front, and furnished with four granular keels, the external 

 of which are abbreviated in front and behind, and the internal ab- 

 breviated in front. 



Tail of normal form, the 1 st segment furnished with the 10 granular 

 keels , the 2 nd , 3 th and 4 th with 8 granular keels , faint traces only of 

 the median lateral keel being visible on the 2 nd , the keels strong and 

 evenly granular throughout, except in the case of the four superior 

 keels of the first three segments in which the posterior granule is the 

 largest; intercarinal spaces more or less granular, the granules on the 

 upper surface of the posterior segments showing a tendency to form 

 definite longitudinal series ; the 5 th segment with five granular keels, its 

 upper surface very convex , being only lightly excavated in the middle. 

 Vesicle somewhat stout , the spine under the aculeus strong , granularly 

 costate beneath, aculeus more than half the length of the vesicle. 



Palp: humerus and brachium granular and granularly costate above, 

 smoother beneath; manus furnished above with distinct granular keels, 

 granular in front, smooth beneath, rounded, a little narrower than the bra- 

 chium, hand-back more than half the length of the movable digit ; digits 

 evenly curved , the external and internal series of teeth composed of 7. 



Legs anteriorly granular and costate. 



Pectines short, furnished with 10—12 (usually 11) teeth. 



Measurements in millimetres of largest specimen. Total length 33.5 ; 

 length of céphalothorax 3.8 ; of tail 19, of 1 st segm. 2, of 2° d 2.8, of 3' d 3, 

 of 4 th 3.5, of 5 th 4.3, of vesicle 2, of aculeus 1.5; width of 1 st segm. 

 1.8, of 5 th 1.4, of vesicle 1.3, height of vesicle 1.4; Palp: length of 

 humerus 3, of brachium 3.5, of hand-back 2.5, of movable digits 3.9; 

 width of humerus 1.2, of brachium 1.7, of manus 1.5. 



This species is closely related to I. maculatus, melanodactylus , and 

 assamensis, but certainly differs from them all. 



Unfortunately only the female of it is known ; comparisons with the 

 other species must consequently be limited to the members of this sex. 



From maculatus it may at once be recognised by a marked diffe- 

 rence in colouring, the whole creature being much more deeply fus- 



