38 BUTHID^E. 



narrower than in L. mucronatus, the width about half the length 

 of the underhand, the latter less than half the movable finger, 

 which is toothed as in L. mucronatus. TiUal spurs quite shodv 

 Pectinal teeth 16 and upwards. 



d" . With sexual features very different from those of L. mucro- 

 natus ; no yellow spot on 3rd sternum. Tail very long and slender, 

 more than nine times as long as the carapace. CTielce also longer 

 than in $ , but otherwise of the same form. Pectinal teeth up to 20. 



Measurements in mm. . Total length 65, carapace 6, tail 37, 

 underhand 3, movable finger 7'8. J . Total length 81, carapace 

 6, tail 57, movable finger 8. 



Distribution. Southern Tenasserim (Oates\ thence throughout the 

 Malay Peninsula into Sumatra, Java, and adjacent islands. 



23. Lychas scaber, Pocock, Jour. Bom. N. H. Soc. vii, p. 300, 1893 ; 



Kraep. Jb. Hamb. wiss. Anst. xii, p. 86, 1895 ; id. Tierr., Scorp. 

 etc. p. 51, 1899 (Archisometrus). 



Colour : carapace yellow ; anteocular triangle and lateral margin, 

 as well as ocular tubercle and an obscure stripe on each side, 

 blackish ; terga yellowish or brownish, with six yellow spots 

 separated by black intervals on the posterior border ; sterna, tail, 

 legs, and palpi yellowish or yellowish brown, scarcely mottled ; 

 the tail darker beneath posteriorly, the fingers darker in their basal 

 half. Carapace coarsely and evenly granular throughout except on 

 the tubercle, as long as the 1st + | the 2nd caudal segments, 

 shorter than the 5th. Terga also coarsely and closely granular 

 throughout. Sterna smooth, 2nd with median sensory area in $ ; 

 last granular throughout, with 4 granular crests, the external 

 short. Tail nearly five times as long as carapace, granular ; 1st and 

 2nd segments with 10 keels. Chela granular and crested as in 

 L. mucronatus ; hand weakly keeled, small, narrower than brachium, 

 its width a little more than half the length of the underhand, 

 which is less than half the movable digit, the latter longer than 

 carapace, armed almost as ia L. mucronatus, with 8 external, 6 

 internal, and 6 median rows. Legs with short spurs. Pectinal 

 teeth 17-19 ( $ ), 19-21 ( rf ). 



c? . Smaller than $ ; tail longer and thinner, about six times as 

 long as the carapace, which is only as long as its 3rd segment, 5th 

 segment practically smooth and keelless ; chelse with hand as wide 

 as brachium, underhand quite half the length of the movable digit ; 

 immovable digit slightly sinuate at base, movable not lobate. 



Measurements in mm. $ . Total length 36, carapace 4-5, tail 22. 

 3 . Total length 37, carapace 3-5, tail 25. 



Loc. S. India : Madras (Thurston), Secunderabad (Bicardo). 



24. Lychas nigristernis, Pocock, Jour. Bom. N. H. Soc. xii, p. 265 r 



1899 (Archisometrus). 



Allied to L. mucronatus, weberi, and scaber. 



Colour varied black and yellow ; anteocular area of carapace and 



