364 Mr. R. I. Pocock on the 



entirely pale ochre, except for the normal brown spot at the 

 extremity of the femur and patella in front. Carapace and 

 sterna very weakly granular laterally. Median eyes larger than 

 in H. fuscus and maurus. Tail narrow, second segment about 

 as long as wide ; intercavinal spaces almost smooth ; keels 

 normal, but the inferiors on the third and fourth segments 

 scarcely denticulated, merely roughened with setal pores; 

 vesicle larger, much wider than the fifth and as wide as the 

 second caudal segment. Hand of chela ornamented above with 

 a reticulated pattern of low ridges, passing into tubercles 

 towards the base of the fingers and becoming obsolete on the 

 inner edge of the hand ; two very strong finger-keels on hand, 

 the external the stronger. Pectines with 12 teeth; genital 

 operculum a little wider than long. Spine-armature of fourth 

 tarsus 10 or 9-7. 



Length 10 millim. ; carapace 8 ; tail 27 ; width of hand 6'7. 

 Loc. Arabia {Mrs. Burton). 



Differs from H. fuscus in being much paler, much smoother, 

 and in having the inferior keels on the third and fourth caudal 

 segments not denticulated, the vesicle large, the hand very 

 strongly everted, and the median eyes much larger. 



In size of vesicle and of median eyes H. arabicus approaches 

 B. propinquus, Simon (Ann. Soc. Ent. Fr. (5) ii. p. 259, 

 1872), from Damascus and Nablous ; but since Simon noticed 

 no difference in the carination of the inferior surface of the 

 tail and of the hand between H. propinquus and fuscus, I 

 cannot do otherwise than conclude that the two are alike in 

 these particulars. 



(6) Ileterometrus Townsendi, sp. n. 



? . — Resembling the preceding in colour, granulation, &c, 

 but with the hand almost entirely smooth above and much 

 less strongly crested, the genital operculum as long as wide, 

 the vesicle only slightly wider than the fifth and much narrower 

 than the second caudal segment. 



Total length 59 millim.; carapace 9 - 2; tail 28; width of 

 hand 7'5. 



Loc. Fort Reshire (near Bushire) and Bushire on the 

 Persian Gulf (F. W. Toionsend). 



(7) Beterometrus Boehmi, Kraepelin. 



Heterometrus Boehmi, Kraepelin, MT. Mus. Hamb. xiii. p. 137 (1896). 

 Scorpio Boehmi, id. Das Tierreich, Scorp. etc. p. 125 (1899). 



Loc. Lake Tanganyika. 



Evidently very distinct from the foregoing species by the 



