392 ME. E. I. POCOCK ON THE 



stigma and passes obliquely inwards for half its length, then 

 almost directly forwards to meet its fellow of the opposite side 

 at the anterior edge of the sternum. The poison-vesicle without 

 or with a spine beneath the sting. 



In Centrums the pectines are only gradually attenuate from 

 the base to the apex ; the sternum that supports them is an 

 inconspicuous plate smaller than the genital operculum, and the 

 sternum of the first somite that bears the stigmata is only 

 furnished with two shallow depressions. Beneath the aculeus 

 there is a spine or tubercle. 



16. Heteeocteis'us junceijs (Herlst). 



Scorpio junceus, Herbst, Nat. ungejiiigelt. Insekten, iv. p. 65, pi. 3. 



fig. 2. 



Scorpio Hemprichii, Gervais, Ins. Apt. iii. p. 54 ; id. Arch. Mus. Hist. 

 Nat. iv. p. 218, pi. xi. fig. 18 ; id. in Castelnau, Escped. dans I'Amer. du 

 Sud, vii. Zool. iii. p. 41, pi. i. fig. 2, 



Rhopalurus Hemprichii, Karsch, Mitth. Miinch. ent. Ver. 1879, p. 119. 



Centrurus Hemprichii, Kraepelin, Jahrb. Hamb. Wiss. Anst.xm. p. 135. 

 2 . Colour ochraceous or castaneous; aculeus and digits fuscous, 

 with fulvous tips ; tail posteriorly inf uscate. Carapace coarsely 

 and. subserially granular. Abdomen also coarsely granular above, 

 gmooth but punctured beneath. Tail rather more than 5^ times 

 the leno-th of the carapace, gradually expanded from the base to 

 the middle of the 4th segment; the 5th in the middle almost as 

 wide as the 4th, abruptly narrowed posteriorly ; all the keels 

 ■well developed, granular, the superior ones, except on the 5th, 

 segment, denticulate ; the 1st segment with 10 keels, the 2nd, 

 3rd, and 4th with 8. Vesicle ovate, aculeus long. Palpi 

 powerful; manus rounded, considerably wider than the brachium, 

 obsoletely keeled; digits long, in contact, the movable about 

 twice as long as the hand-back, Pectines short, with from 17- 

 19 teeth. 



Total length 105 mm., of carapace 12, of tail 65; width of 

 1st tail-segment 6-5, of 4th 7-5, of brachium 4*5, of manus 6; 

 length of hand-back 7, of movable digit 14. 



S. Tail slightly longer than in female, being nearly six 

 times the length of the carapace, and much more robust, ex- 

 panded from the base to the middle of the 5th segment. Manus 

 much wider than in the female ; the digits strongly sinuate, and 

 widely separated at the base. Pectines with from 18-23 teeth. 



