308 Mr. R. I. Pocock on the 
The ocular tubercle in front of the middle of the carapace. 
The feet not or at least less lobate. 
Male with a longer tail and longer pectines ; digits sinuate 
and lobate in Nebo, but apparently not in Diplocentrus. 
Genera: Diplocentrus, Peters; Oiclus, Simon; Nebo, 
Simon (syn. Cyphocentrus, Karsch). 
Distribution. Northern Neotropical, Arabia. 
Subfamily Hzurscorrizryt. 
A subfamily presenting interesting annectent features. 
The median eyes in advance of the middle of the carapace, 
as in the Diplocentrini. 
The penultimate fang of the chelicere large, as in the 
Tschnurini and Diplocentrini. 
Feet armed beneath, as in the Diplocentrini, but with the 
claws entirely free, as in the Ischnurini, and with a fine 
median series of spicules. 
Sternum elongate, parallel-sided. 
‘ail with a median keel, as in the Urodacini. 
Male with a long tail, the vesicle symmetrically dilated at 
the base of the aculeus. 
Genus: Hemiscorpius, Peters. 
Distribution. Arabia. 
Subfamily Uropacryz. 
Resembling the Scorpionini, but differing in having :— 
T'wo lateral eyes on each side. 
A single inferior median keel on the tail. 
The digits of the chele not angularly notched. 
Male with a long tail and long pectines ; chele apparently 
unmodified. 
Genus: Urodacus, Peters (syn. Zodacus, Pocock) ; Joctonus, 
Thorell. 
Distribution. Australia. 
Family Iuride. 
Feet furnished with two distinct pedal spurs. 
Sternum pentagonal, very variable as regards its length 
and breadth, but nearly always wider than long. 
‘The lower surface of the feet nearly always compressed and 
furnished with a median series of spicules or tufts of hair. 
