DESCRIPTIONS OF SCORPIONS FROM INDIA, 113 



(12.)— Archisometrus l^vifrons, sp. n. 



I propose this new specific name for the example of Archisometrus 

 from Calcutta, which I previously assigned to the Burmese species 

 named A. shoplandi by Oates. I am now of opinion that the differences 

 that obtain between this example and the type of A. shoplandi, coupled 

 as they are by a difference of locality, are sufficient to justify the 

 establishment of a new species for the former. 



It differs from A. shoplandi in two main features — (1) in having the 

 legs variegated black and yellow, instead of wholly yellow, and (2) in 

 having the digits much longer as compared with the length of the 

 hand-back, the movable digit being more than twice the length of the 

 hand-back in A. Icevifrons and less in A. shoplandi. Probably other 

 differential characters will be discovered when well-preserved specimens 

 come to hand. There are 22 pectinal teeth* 



Total length 31 mm. 



Locality.*— Calcutta,. 



In structural characters this species lies between A. shoplandi and 

 A. hendersoni, resembling the latter in its long digits and spotted legs* 

 and the former in the absence of fine granulation from the ante- 

 ocular area of the carapace and in the absence of distinctly-defined 

 supero-lateral keels on the fifth caudal segment. 



Genus Isometrus, Hempr. and Ehrenb. 



(13.)— ISOMEfcRUS RIGIDULUS, Sp. n. 



Colour. — Fuscous, Variegated with yellow above, anterior portion of 

 'carapace entirely black ; the fourth and fifth sterna infuscate. 



Trunk. ^-Coarsely granular above ; sterna smooth ; the last granular, 

 with four distinct granular keels. 



Tail.— About five times the length of the carapace, robust, the first seg- 

 ment only provided With 10 keels, the intercaf inal spaces finely granular ; 

 the terminal granule of the superior keel of the second a little enlarged ,, 

 of the third long and spiniform ; the upper surface of the fifth segment 

 oonvex, elevated, the width and height of this segment almost equal to 

 half its length ; vesicle with a strong spine beneath the aculeus. 



Chela. — Moderately long ; hand smooth, a little wider than the 

 brachium, the back of the hand about three-quarters the length of tho 

 movable digit 

 15 



