ON A SMALL COLLECTION OF SCORPIONS.^ 299 



smooth ; brachinm furnishe d above with three granular keels and in 

 front with about six dentiform tubercles^ longer than the humerus 

 and considerably thicker ; manus thick, considerably thicker than the 

 brachium, its width equal to half the length of the hand-back, and 

 considerably more than a third of the length of the movable dactylus ; 

 not rounded internally but nearly parallel- sided ; the dactyli 

 separated at the base owing to the sinuation of the immovable one. 



Legs as in /. maculatus, the two posterior tibia not spurred. 



Pectines, short, not extending to the extremity of the posterior 

 coxae, armed with 16 teeth. Measurements in mm. Total Ig. 67; 

 cephalothorax Ig. and width 6 ; tail Ig. 45, Ig. of 1st segment 4-5, of 

 2nd 6-5, of 3rd 7, of 4th 8-3, of 5th 10, of vesicle 4-5, width of 1st 

 segment (at distal end) 2-5, of oth 2*3, of vesicle 2-5 ; Palp. ; humerus 

 Ig. 8-3, width 1-5 ; brachium Ig. 8*6, width 1-9 ; manus Ig. (along 

 back) 5*5, width 2*8 ; movable dactylus Ig. 8. 



Locality, Madras and the Sheveroy Hills. 



This species that I previously recorded from Madras at I. maculatus 

 proves in reality to be a different form, but whether a variety or a 

 species must for the present be left undecided. I gladly dedicate it to 

 its discoverer, Mr. Edgar Thurston. 



It is very closely related to /. maculatus^ of which a fairly good 

 figure was published by Mr. Gates in the 4th number of the 3rd vol. 

 of this Journal. Indeed before the male sexual characters are 

 declared, the two species are difl&cult to separate — a circumstance 

 which led me, not knowing the adult male, to identify the species as 

 maculatus. Apart, however, from sexual features, the two species may 

 be recognised by certain differences in colour. Thus in /. maculatus 

 there is a triangular fulvous patch on the cephalothorax extending 

 from the ocular tubercle to the anterior margin and sensibly dilating 

 from behind forwards, and the fifth segment and the poison vesicle 

 of the tail are flavous and spotted with fuscous. Moreover the 

 pectines or ventral combs, have from 17 to 19 (usually 18) teeth. 

 In /. thurstoni, on the other hand, the ante-ocular flavous patch is, 

 although present, very much smaller, is not sensibly triangular in 

 shape and does not reach at least the middle of the anterior border — 

 the' poison vesicle and fifth caudal segment too are rather clouded 

 with fuscous or even ferruginous, and lastly there are only 15 or 16 



