18 BUTHID^E. 



about 6 dentiform tubercles, of which the posterior three are large 

 and triangular, but unequal in size, becoming progressively longer 

 towards the posterior end of the segment : lower surface of 3rd 

 segment also furnished with 6 large dentiform tubercles on its 

 median keels, and a transverse row of 6 becoming smaller externally 

 on its anterior edge ; anterior edge of lower side of 4th also furnished 

 with a transverse row of 6 similar but rather smaller tubercles ; 

 granules of inferior lateral crests of 2nd and 3rd segments increasing 

 in size and becoming tuberculiform posteriorly; inferior lateral 

 crests of 5th segment strongly tuberculate, three of the tubercles 

 being especially large and dentiform and close together, anal rim 

 of this segment elevated and lobate, the upper lateral lobe large and 

 bifid; upper surface of tail smooth, lower surface of 1st, 2nd, and 

 3rd segments smooth, lower and lateral surface of 4th granular. 

 Ghelce, with humerus and brachium granularly crested, elsewhere 

 smooth ; hand smooth, about as wide as brachium ; underhand 

 considerably excelling the width of hand, and less than half the 

 movable digit ; digits not lobate, rather strongly curved, furnished 

 with 12 rows of teeth. Legs with granularly crested femora; 

 distal segments of 1st, 2nd, and 3rd legs thickly hairy ; lower side 

 of tarsi sparsely hairy. Pectinal teeth 19. 



,5 . Differing from the $ in having the tail longer and thinner, 

 being about six times the length of the carapace, which is shorter 

 than its 5th segment and only as long as the 1st and | of the 2nd ; 

 1st caudal segment longer than wide, 4th twice as long as wide. 

 Coxa3 of cephalothorax and abdominal sterna finely and closely 

 granular, the 4th and 5th sterna furnished with four finely-granular 

 keels ; the tuberculiform teeth on the tail are the same in number 

 as in the female, but are smaller and more widely separated, and 

 the upper lobe of the anal border of the 5th segment is more deeply 

 bifid. Pectinal teeth 28-29. 



Measurements in mm. c? . Total length 58, carapace 6, tail 37, 

 movable digit 8. 



Loc. Sind : Kelat Frontier (Kemball) ; Karachi ; Ormara, on 

 the Mekran coast, 130 miles west of Karachi (Toivnsend). 



The typical form of this species occurs in Persia at Teheran. 

 The female only is known. B. odonturus was based upon a male ; 

 but the subsequent discovery of the female at Karachi shows that 

 the differences between B. odonturus and B. dorice should probably 

 be regarded merely as of subspecific importance. In B. dorice the 

 inferior surface of the 4th caudal segment has four large and two 

 much smaller teeth on its anterior border, is much less granular, 

 with more complete median keels ; on the 5th segment the infero- 

 lateral teeth are more widely separated and less acute, and the 

 upper half of the anal lobe is undivided. 



3. Butlras macmahoni. sp. n. 



Colour yellow, keels of carapace and of upper side of humerus 

 black, those of terga slightly darkened ; inferior keels of 2nd-4th 

 caudal segments and the three inferior crests of the 5th bJack. 



