Mello-Leitão — Escorpiões Sul-Americanos 
39 
guiar elevation; sternites II to IV smooth; V granulated, with 
four longitudinal keels ; the inner united, forming the letter U, and 
the lateral ones on the median three fifths. Tail very densely gra- 
nula te d; segment I with twelve keels, II with ten, III and IV 
with êigth; V with a median ventral keél and four lateral ones; 
the segments IV and V slightly wider than I to III. Vesicle cons- 
picuous slightly granulated, larger than sting, presenting a minute 
round tubercle under this last. Comb with 23 teeth. Pedipaips 
granulated: femur with five granular keels, the median inner one 
the strongest; tibia with three upper crests and the inner keel 
with a very strong basal tooth; hand less wide than tibia, with 
incurved digits, the movable digit one and a 'half times fonger 
than hand, with 1 o lines of granules, two lines of accessory 'den- 
ticles and a basal lobe. 
It is described a new Argentinian Tityus : 
Tityus mazzae n. sp. 
çf — 42 mm. 
Carapace marbled in yellow and chestnet; tergites ches- 
tnut with two indistint longitudinal light stripes. Tail yellowish 
brown, darkened at end of segment III, and segments IV and 
V fulvous-blacck, as vesicle. Crests of tail black. Sternites yellow 
or brown with posterior border yellow. Legs and pedipalps une- 
venly spoted chelae roast-yellow, with fulvous crests. Chelicers 
yellow, reticulated in pitch. Combs ligth-yellow. 
Carapace densely granulated (fig. 10b). Tergites 1 to 
VI densely granulated; tergite VII with four sinuous crests. Ster¬ 
nites rügous, chagreened, with fine granulations; sternites IV and 
V with four longitudinal crests, Comb with 15 teeth, Tail seg- 
laíeral accessory one present at distai third; the median upper 
ment I with ten complet crests; II with eigh complet crests and the 
crests of II and III with two stronger apical teeth III and IV 
with 8 crests and V with five. Inters paces granulated, Vesicle yel¬ 
low, with a median under keel and a strong, conical, sharppoin- 
ted subaculear process. 
They are described three new species of Bothnarids, 
a Brasilian Boihriartis, a Centro machetes of Chili and the type 
o fa new Argentinian genus (Iophoroxenus), 
