LYCHAS. 37 



finger-keel, a little narrower than brachium, width a little less 

 than length of underhand : digits in contact, not sinuate ; the 

 movable longer than carapace, at least twice the length of the 

 underhand, armed wiih Grows of teeth, the basal very long, extend- 

 ing over half the length of the finger; the outer row of teeth 

 9 (810) in number ; the inner row only 5, situated in the distal 

 half. Legs externally granular, with short tibial spurs. Pectinal 

 teeth about 21. 



c? with tail a little longer than in $ and stouter, the 5th 

 segment and vesicle being scarcely granular and the former not 

 carinate. Ok$la with hand much inflated, considerably wider than 

 brachium ; the underhand more than half the length of the movable 

 digit, which is slightly sinuate' and armed with a large tubercle 

 at the base ; immovable finger with its basal half strongly arched, 

 so that when closed at the tip a wide space is left between the 

 basal ends of the two fingers. 



^Measurements in mm. . Total length 58, carapace 6, tail 32, 

 underhand 3, movable finger 6-5, width of hand 2. 3 . Total 

 length 53, carapace 6, tail 33, underhand 4, movable finger 6'5, 

 width of hand 3. 



Distribution. Occurring in abundance in both Upper and Lower 

 Burma and Tenasserim (Oates <$ Fea\ thence spreading eastwards 

 into China and Siam, and southwards over the islands of the Indo- 

 Malayan area as far as Flores. 



22. Lychas scutilus, (J. Koc-h, Amchn. xii, p. 3, fig. 962, 1845 (Lychas) : 

 Thorell, Ann. Mus. Genova, xxvii, p. -525, 1889-1890; Pocock, 

 Jour. Linn. Soc., Zuol. xxiii, p. 435, 1890 (Isometrus) : scutatus, 

 C. Koch, Arachn. xii, p. 163 (index), 1845 (Lychas) ; Thorell, Butt. 

 Soc. ent. Ital. xxv, p. 367, 1894 ; Kraep. Tierr., Scorp. etc. p. 44, 

 1899 (Archisometrus) : weberi, Karsch, Berlin, ent. Zeits. xxvi, 

 p. 184, 1882 (Isometrus) ; Kraep. Jb. Hamb. wiss. Anst. viii, p. 221, 

 1891 (Archisometrus) : mesor, Simon, Ann. Mus. Genova, xx, 

 p. 371, 1884 (Isometrns) : phipsoni, Oates, Jour. Bom. N. H. Soc. 

 iii, p. 248, figs. 1, 2, 1888 (Isometrus). 



. Colotir : trunk much more uniformly fuscous above than in 

 mucronatus, the terga, however, marked with a pair of circular 

 yellow spots near the middle, and one on the posterior lateral 

 angles ; the last tergum mostly yellow, blackish only in front ; 

 anterior four caudal segments yellowish red above, last segment 

 and vesicle blackish ; chela? mostly yellow ; the extremity of the 

 brachium, the hand, and the basal half of the fingers blackish ; 

 legs yellowish, or blackish with yellow tarsi. Carapace and terga a 

 little more coarsely granular than in L. mucronatus. Last sternum 

 with 4 granular keels ; 3rd with rounded punctured spot in the 

 middle of its hinder portion. Tail much longer and thinner, 

 about six times as long as the carapace ; 2nd segment more than 

 twice, 4th about three times as long as wide ; keels stronger than 

 in mucronatus ; the inferior lateral edges of the 5th carinate. 

 Chela 1 , with hand granular and distinctly carinate above, but 



