308 Mr. R. I. Pocock on the 



Tlie ocular tubercle in front of the middle of the carapace. 

 The feet not or at least less lobate. 



J\Iale 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 (sjn. Cyphocentrus, Karsch). 



Distribution. Northern Neotropical, Arabia. 



Subfamily Hemiscospiini. 



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 chelicerse large, as in the 

 Ischnurini 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. 



Tail 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 Urodacini. 



Resembling the Scorpionini, but differing in having : — 

 Two lateral eyes on each side. 

 A single inferior median keel on the tail. 

 The digits of the chelae not angularly notched. 

 Male with a long tail and long pectines ; chelae apparently 

 unmodified. 



Genus : Urodacus, Peters (syn. lodacus, Pocock) ; loctonus, 

 Thorell. 



Distribution. Australia. 



Family luridae. 



Feet furnished with two d'stinct 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. 



