314 Mr. R. I. Pocock on new Genera 
Tityus Quelchit, sp.n. (Pl. XIV. fig. 1.) 
Closely allied to 7. columbianus (Thor.). 
Colour fulvous or flavous, nigro-maculate. 
Carapace blackish laterally and mesially behind the black 
ocular tubercle, the interocular portion and the sides of the 
upper surface lurid and almost immaculate ; the tergites with 
their posterior angles widely flavous, with two other con- 
spicuous flavous spots along the posterior border on each side 
of the middle line; the tail obscurely variegated with fuscous 
patches and spots ; the fifth segment and the vesicle much 
darker, sometimes uniformly fuscous ; chelicerae fuscous dis- 
tally ; palpi fusco-flavo-maculate; the brachium darker at its 
distal end and the immovable digit at the base; digits fusco- 
maculate ; legs nigro-maculate ; apices of the maxillary lobes 
of the first and second pairs of walking-legs fuscous. Sterna 
fulvo-brunneous, obscurely mottled with fuscous. 
Carapace and tergites granular throughout; the sides of 
the ocular tubercle granularly carinate, and the carapace 
posteriorly bicarinate ; tergites with a posterior median granular 
keel, and a curved transverse granular crest; the seventh 
tergite with the keel well developed. 
Tail nearly parallel-sided, rather more than four and a 
half times the length of the carapace, the intercarinal spaces 
granular, the keels strong and granular; the second segment 
with only a posterior vestige of the median lateral keel, the 
superior keels of the second, third, and fourth segments 
strongly elevated behind and terminating in a larger tooth, 
the upper surface of the fifth weakly sulcate in the middle, 
nearly smooth behind, the edges squared and granular ; 
vesicle compressed, much narrower than the fifth segment, 
smooth and punctured above, serially granular beneath, mesi- 
ally carinate, the spine beneath the sting deep and compressed, 
very conspicuous, armed above with two spinules. 
Palpi finely and closely granular throughout, all the normal 
keels well developed and granular; hand strongly carinate, 
rounded, a little narrower than the brachium; the movable 
digit long and slender, twice the length of the hand-back, 
furnished with 11-12 rows of teeth along the middle series. 
Legs carinate and granular, the soles of the feet furnished 
with long closely-set hairs. 
Sterna finely granular throughout, the fifth furnished with 
four granular keels, the fourth obsoletely bicarinate poste- 
riorly, and the third furnished with a median posterior smooth 
polished area, 
