ON THE PEDIPALPI OF NORTH AMERICA. 371 



only two-thirds the length of the other raised line, and the joint is then scooped 

 out to the level of the latter, which does not end in a spine. On the first four 

 articulations the middle lateral crests are almost entirely obsolete. On the fifth 

 they are more strongly pronounced. This joint is much more elongate than the 

 others. Its supero-lateral crests are not so strongly denticulate as those of the 

 others, and have no spine at their distal extremity. The infero-lateral and inferior 

 crest exist on the first four joints as four black, occasionally somewhat obsolete, 

 ridges, but are not crenulate. On the fifth both the inferior-lateral and the single 

 median-inferior crests are denticulate. The sixth caudal joint is somewhat ovate, 

 llattened above, and without ridges. On the lower surface there exists a faint 

 mesial groove. The sting is slender and strongly curved. 



Length of body d ? one inch ; of tail, ? one inch, two lines, c? one inch," four 

 lines. 



Hab. — Tes^s. Smithsonian Museum. 



Scorpio punctatus. — "Scorpio (punctatus) octonoculus, pectinibus 16-dentatis,manibu3 elongatis ; digitis 

 filiformibus ; cauda corporis longitudine ; aculeo basi mucronato." 



" Enfin le troisieme caractere de ce scorpion, c'est que le dernier na3ud de la queue, qui est le 

 support de I'aigulon, est ovale & garni d'arretes fornixes par des points Aleves ; mais ce'quon lui trouve 

 de remarquable, c'est qu'il se prolonge en devant & en dessous de I'aigullon en une espece de eminence 

 commc une pointe avancee, garnie de chaque cote d'une petite epine & tout pres de I'origine de ce 

 nceud on voit au bord exterieur un petit tubercule arrondi." 



Scorpio punctatus, De G^er, Mem. des Insect., vol. vii. p. 343, pi. 41, fig. 1. 



With this species we are not at all acquainted, nor does it seem likely that we 

 ever shall be. We think it scarcely probable that any identification will be esta- 

 blished. iS. 'punctatus, Gervais, Apteres, vol. iii. p. 36, is probably different. 



S. MACULATUS, Dc Gcer, Mem. Insect, vol. vii. p. 346, pi. 41, fig. 9. 



We are not acquainted with this species, which also is scarcely recognizable. The 

 describer says, " C'est a Surinam & en Pensylvauie qu'on trouve les scorpions de 

 cette espece" ! ! 



The species has certainly become extinct in the latter locality since 1778 ! 



S. TESTACUS, De Geer, Mem. Insect, vol. vii. p. 347, pi. 41, fig. 11. 

 S. AusxRALis, De Geer, Mem. Insect., vol. vii. p. 348, pi. 41, fig. 5. 



Gen. III. CENTRURUS. 



Gen. Scorpio (partim) subgen. Ccnlntrus, Gervais, Apteres, vol. iii. p. — . 



Fam. Venlrurides. Gen. CeiUrurus, Vaejovis, Koch, Ucbcrs Arachnid. Syst., p. 38. 



