INDIAN AND BURMESE SCORPIONS. 245 
known species does not much exceed three inches im length, and the 
smallest is less than two inches. The colours of all are yellow or 
fulvous marked with black, the former colour preponderating on the 
limbs and the latter on the head and body. 
The genus Isometrus is characterized by the following structural 
peculiarities. The sternum is triangular ; the movable finger of 
the mandibles is furnished with teeth on both edges ; the fixed finger 
has teeth on the upper margin, but only one small tooth or spine on 
the lower edge;the serrated edges of the fingers of the chelz are 
composed of short simple rows of small teeth obliquely parallel to 
each other, and each row furnished with a larger tooth, one on each 
side, at the basal end of the row; the sixth joint of the tail is 
furnished with a spine under the sting. 
Of the eight species found in India, Burma and Ceylon, I have 
been unable to examine specimens of J. trtcarinatus, EH. Simon, 
and I. basilicus, Karsch, the former described from Pondicherry 
and the latter from Ceylon. Itis hoped that some of the mem- 
bers of the Society, favourably situated for the purpose, will 
endeavour to procure specimens of these two species for the 
museum. 
I subjoin a key by means of which the eight species found 
within the limits of British India may be identified without much 
trouble : 
A.—Second joint of tail furnished with ten keels. 
a. The last abdominal segment below, with four 
keels. 
a’. Mandibles, cephalo-thorax and body above 
blackish; cheliceres and legs fulvous 
without marks. ...csceeecssseeteree es Rs shoplandi. 
}’. The whole animal uniform fulvous. ...+-++-. tricarinatus. 
b. The last abdominal segment below, with only 
two keels. 
oc’. The upper part of the first four joints of the 
i i each si the second 
tail, extending on each side to 
keel, imniaculate fU]VOUS. ceeessvcceseseeees atomarius. 
d'. The upper partof the first four joints of 
the tail mottled with Drow cecseierseree varius. 
84 
