Mr. R. I. Pocock on Neotropical Scorpions. 85 
granular at the sides, but the rest of the trunk is entirely 
smooth in both sexes. The anterior four segments of the 
tail are smooth beneath and the superior edges are rounded 
and at most minutely granular. The brachium is smooth 
above and behind, and the manus is also smooth and only 
indistinctly costate. The pectines are larger in the male 
than in the female, and are furnished with nine teeth in both 
sexes. The female measures about 52 millim. in length, the 
carapace being 7‘8 and the tail 30. 
Whether or not Chactas Fuchstt of Berthold is the same 
species as Van Benedenit I have not been able to satisfy 
myself. { may point out, however, that the relative measure- 
ments of the caudal segments in Puchsii apply exactly to the 
female of my Van Benedenii, and that what Berthold says of 
‘ these measurements in his Van Benedenii is not true of mine. 
Moreover the median eyes in the latter are not grey, but the 
colour of clear amber. If, however, Berthold has correctly 
determined the sexes of his species, the female of Fuchsii 
certainly differs from that of Van Benedenii in having the 
finger (by which presumably the movable finger is meant) 
much shorter than the hand (24:44), that is, shorter by 
nearly its own length; and in the male of Puchsii the finger 
is only by a third of its own length shorter than the hand. 
Berthold asserts, moreover, that the carapace of his species is 
entirely smooth, which is not strictly the case in Van Bene- 
denii. 
Of the meagre description of Ch. brevicaudutus of Karsch 
very little can be made. Very possibly the species may be 
the young of Van Benedenit or Fuchsit. 
Chactas lepturus, Thorell. 
Chactas lepturus, Thorell, Ac. Soe. Ital. Sci. Nat. xix. p, 266, 
The specific name given to this species by Thorell was 
upset in favour of Thorellit by Karsch, who alleges that the 
Scorpio lepiurus of Palisot de Beauvois is also a Chactas, 
although belonging to a different species from that which 
received the same name from Thorell. 
Karsch bases his assertion as to the generic position of 
lepturus, Pal. Beauv., upon a specimen in the Berlin Museum, 
which he believes, for unstated reasons, to be Beauvois’s type. 
It seems a pity, however, that a more favourable selection of 
the type was not made; for, seeing that Beauvois asserts 
that his species had eight eyes and his figure shows that the 
tail is only as long as the trunk and the carapace is as long 
as the anterior three segments, whereas Karsch’s specimen 
