and Species of Scorpions. 315 
Pectines furnished with 15-16 teeth ; the basal intermediate 
lamella not produced. 
Measurements in millimetres.—Total length 40°5, length of 
carapace 4°8, of tail 23; width of second and fifth caudal 
segments 2°3, of vesicle 1:5. 
Two female specimens from British Guiana collected by 
Mr. J. J. Quelch, to whom I have great pleasure in dedi- 
cating the species. 
This species differs from 7. columbianus in being paler in 
colour, especially beneath, but chieflly in having the spine 
on the vesicle of the tail very large and triangular. 
The British Museum has also a dried specimen of a scorpion 
which I believe to be the male of 7. Quelchti, from Para. In 
this specimen the tail is long and slender, being nearly six 
‘ times the length of the carapace. The whole animal measures 
about 34 millim. 
Tityus pusillus, sp. n. 
?. Nearly related to the preceding, but more distinctly 
spotted with black; the maxillary lobes, however, are not 
fuscous, and the fifth caudal segment and the vesicle of the 
tail are of the same tint as the rest of the tail and not con- 
spicuously infuscate as in 7. Quelchit and T. columbianus. 
Trunk carinate and granular above as in the preceding 
species; the lower surface perhaps rather more coarsely and 
closely granular. 
Tail a trifle more than five times the length of the carapace, 
slender, nearly parallel-sided, the fifth segment being only 
very slightly wider than the second ; the vesicle a little more 
globular than in 7. Quelchit, with proportionately larger 
tooth, but with much less distinctly defined granules; the 
fifth caudal segment also less distinctly granular, and the 
terminal tooth of the superior caudal keels is only a little 
larger than the rest upon the third and fourth segments. 
Falpi and legs as in T. Quelchit, but with 14-15 rows of 
teeth along the middle series of the digit. 
Pectines with 16-17 teeth, the basal intermediate lamella 
slightly produced. 
Measurements in millimetres —Total length 32, length of 
carapace 4, of tail 20+ ; width of fifth caudal segment 1:6, of 
vesicle 1°3. 
g. A little smaller and slenderer than female, with tail 
slightly longer, being a little more than five and a half times 
the length of the carapace. Pectines much larger, with 17-18 
teeth. 
'wo specimens in alcohol, collected by Mr. G. A. Ramage 
at Iguarassu. 
