36 BTJTH1D I . 



b\ Tibial spurs of 3rd and 4th legs short, 



scarcely longer than the hairs of the tibia. 



a". Abdominal sterna thickly marbled 



with black L. niffristernis, p. 38, 



b r \ Abdominal sterna, with exception of 

 the 5th, uniformly pale yellow. 

 a'. Last abdominal sternum with four 

 granular keels ; hand with two 



granular finger-keels L. scutilus, p. 37. 



b" . Last abdominal sternum with only a 



pair of distinct keels : hand only 



obsoletely keeled 



a*. Cheke and legs uniformly yellowish 



brown ; movable finger much 



longer than carapace ; fingers 



scarcely sinuate m <S L. scaber, p. 38. 



b 8 . Chelae and legs variegated black 

 and yellow ; movable finger only 

 slightly exceeding carapace ; 

 fingers strongly sinuate in J .... L. mucronatus, p. 36. 



21. Lychas mucronatus, Fair. But. Syst. Suppl. p. 294, 1798 (Scorpio) ; 

 Thorell, Ann. 3Ius. Genova, xxvii, p. 566, 1889 (Isometrus) ; Pocock, 

 in Weber, Beise Niederl. O.-Ind, iii, p. 85, pi. vi, fig. 1, 1893; 

 Thorell, Bull. Soc. ent. Ital. xxv, p. 368, 1894; Kraep. Tierr., 

 Scoip. etc. p. 46, 1899 (Archisometrus) ; Kraep. Jb. JIamb. 

 iviss. And. viii, p. 223, 1891 (Archisometrus) : varius, C. Koch, 

 Arachn. xi, p. 29, fig. 864, 1845 (Tityus) : Simon, Ann. Mus. 

 (ienova,xx, p. 362, 1884; Oates, Jour. Bom. N. II. Soc. iii, p. 245, 

 1888 (Isometrus) : atomarius, Oafes, Jour. Bom. A". H. Soc. iii, 

 p. 245, 1888 (? atomarius, Simon, Ann. Mus. Genov. xx, p. 363. 

 1884) (Isometrus). 



Colour yellow varied with black : carapace with ocular tubercle 

 and interocular triangle black, the rest of it marked with irregular 

 greyish-black lines ; terga black in the middle along the keel, a black 

 patch interrupted by a yellow > -shaped mark on each side, and 

 six yellow spots separated by black spaces ; sterna yellow, with a 

 blackish patch on each side; tail darker posteriorly, the lower 

 surface lined with black, the posterior ends of the segments 

 blacker than the anterior; vesicle uniformly deep brown ; mandibles 

 black; humerus of chela mottled with black above ; brachium mostly 

 black above, yellow at the base ; hand yellow, with a few small 

 spots ; basal half of fingers black, distal end yellow. 



§. Carapace, a little shorter than 5th caudal segment, as long 

 as 1st and half the 2nd, granular throughout. Terga granular 

 throughout, with single median granular keel. Sterna smooth, 

 excepl the last, which is closely granular and furnished with a pair 

 of median granular keels, the lateral keels obsolete. Tail about 

 five times as long as the carapace, finely granular ; 2nd segment 

 almost as wide as long, 4th not twice as long as wide ; median 

 lateral keel present, but weak on the 2nd segment ; vesicle granular 

 below ; spine beneath aculeus triangular, pointed. Chela finely 

 granular, with granular crests ; hand almost smooth, with obsolete 



6 



