SCOKPIONS OF THE GENUS ISOMETRUS. 443 



54, of trunk 17 ; 1st caudal segment, length 5'5, width 2"7 ; 2nd, 

 length 6-5 ; 3rd, length 7-5 ; 4tlj, length 8-3 ; 5th, length 9, width 

 2'5. Palp — humerus, length 6 ; brachium, length 8, width 2'7 ; 

 manus, widtli 3, length o£ " hand-back " 4*2 ; movable digit, 

 length 7'5. 



A single male specimen from E-ound Island (near Mauritius), 

 collected by Col. Pike, U.S. Consul, and presented to the British 

 Museum in 1870 by Sir Henry Barkly. 



Although, owing to its dried state and the absence of the 

 pectiues and of the vesicle, a full diagnosis of this specimen has 

 been rendered impossible, I have had no hesitation in describing 

 it as the representative of a new species. Of all the species 

 known to me, it appears to be most nearly allied to the ludo- 

 Malayan form I. scutilus of Koch. It may, however, be at once 

 recognized from this by its dilated Imnd, sinuate finger, and by 

 the strongly spiniform nature of the terminal tooth of the superior 

 keels on the first three caudal segments. 



IsoMETEUS Btjedoi, Simon. (PI. XI. fig. 5.) 

 {Simon, Bidl. Soc. Ent. Belcj. 1882, p. Iviii.) 

 Colour testaceous or ochraceous, variegated with black or 

 fuscous patches, spots, or lines. Cephalo thorax, with ocular 

 tubercle and anteocular area, infuscate ; a more or less inter- 

 rupted, longitudinal, fuscous band runs from the area of the 

 lateral eyes to the posterior margin ; the posterior half of the 

 sulcus fuscous ; the postero-lateral portions bearing a patch of 

 black which corresponds in position to a patch on each of the 

 tergites ; on the sides are two or three oblique, short, fuscous 

 bauds. Upper surface of the abdomen bearing three parallel, 

 longitudinal, fuscous bands, whereof one is median and one on 

 each side ; the median band more or less completely divided into 

 two by a testaceous spot which occupies the centre of each tergite ; 

 the lateral bands, also, more or less broken up by testaceous spots ; 

 the sides of the tergites, except for a single anterior black spot, 

 testaceous ; under surface of trunk testaceous, the posterior 

 sternite only being slightly infuscate laterally. Upper surface 

 of the tail mostly pale, sometimes with a median fuscous spot on 

 the segments ; the sides and inferior surface clouded with fuscous 

 or black patches ; the under surface and sides of the fifth seg- 

 ment uniformly fuscous ; vesicle mostly fuscous, with more or 

 less faint traces of pale lines ; aculeus paler externally than 



