414 Mr. R. T, Pocock on some 



fifth caudal segment, punctured, weakly granular in the 

 hollows of the upper surface and at the sides; terga also 

 })unctured. 



Tail about four times as long as the carapace ; second 

 segment a little longer than wide, fifth a little more than 

 twice as long as wide; superior and supero-lateral keels 

 strong and granular, the three inferior keels strong and 

 granular on the third, fourth, and fifth, weakly granular on 

 the first and second segments ; the median keel obsolete on the 

 anterior half of the first segment; vesicle wider than the fifth 

 segment, smooth, punctured ; aculeus long and normally 

 spiniform in its distal half. 



Cheke punctured ; humerus with normal granular keels 

 above and in front ; the upper and lower anterior crests on 

 brachium granular ; hand flat above, with weak median 

 keel, strong but smootii external finger-keel ; external keel 

 of hand-back strong and granular ; movable finger longer 

 than carapace. 



Genital operculum cordate, sulcate in front. 



Pectinal teeth 10. 



^ . — Not very different from female, but rougher, with 

 close punctuation on the tergites and carapace ; tail longer, 

 the carapace a little shorter than its first and second segments; 

 hand a little wider, its width about equal to the length of the 

 Iiand-back ; inner edge of the hand granular. 



Genital operculum transversely oval, divided. 



Pectinal teeth 13. 



Measurements in millimetres. — $ . Total lengtli 35 ; cara- 

 pace 4*8, tail 18, movable digit 5. 



^ . Total length 32; carapace 4*5, tail 19. 



Loc. Aden {E. II. Dates mxd Col. Yerhury). 



1 formerly regarded the specimens here described as imma- 

 ture exan,ples of II. lepiuriis known from Bagdad. No 

 doubt, however, they are adult. The species may be recog- 

 nized at orice from lejifurus by having the aculeus normally 

 spiniform, and not short and subconical as described by 

 Kraepelin (JB. Hamb. xi. p. Ill, 1894). The male of 

 lepturus, moreover, has the vesicle peculiarly modifi(.'d and 

 elongate. 



Genus Ukodacus, Pet. 



Urodacus macriirus, sp. n. 



J . — Colour. Carapace deep ferruginous, tergites darker ; 

 legs, chelcB, and tail paler yellowish red; fingers dark. 



Carapace as long as the first and one quarter of the second 



