Scorpions of the Genus Urodacus, Pet. 65 



carapace 12 ; length of tail 60, of its fifth segment 14 ; width 

 of hand 8. 



Log. Lawlers, East Murchison Goldfields, West Australia 

 (IV. 0. Mansbridge). 



The following table may help others to identify the species 

 of this genus known to me : — 



a. Hands low, Hat above, height of their outer 



surface less than half its length mea- 

 sured along the inferior keel ; tail slender, 

 its segments parallel-sided. 

 a 1 . Hands without an upper median keel ; 



carapace widely and deeply emarginate 



in front, smooth ; tergal plates and first 



four segments of tail also smooth, the 



superior crests of the latter alone being 



feebly granular; a row of 1] pores on 



the brachium below and 14 on the 



hand ; tail about 3^ times as long as 



carapace, which is longer than its first 



and second segments ; 6 spines on 



outer side of protarsus of first and 



second legs and 3 on the tibia Darwinii, Poc, 2 • 



b l . Hands with a strong upper median keel ; 



carapace deeply but narrowly emargi- 

 nate, granular ; tergites and tail gran- 

 ular, the superior crests of the latter 



stronger and posteriorly spiniform ; 



8-9 pores on brachium and 9-10 on 



hand; tail a little more than 4 times 



as long as carapace, which is shorter 



than its first and second segments ; 5 



spines on outer side of second protar- 

 sus and only setiform spines on the 



tibia planimanus, Poc, 9 • 



b. Hands high, convex above, height of their 



outer surface more than half its length. 

 ir. Hands practically keelless ; 15 pores 



on lower surface of brachium and 19 



on hand ; of large size, up to 114 mm. 



in length, carapace about 17 mm. long ; 



carapace smooth, deeply emarginate, 



with rounded frontal lobes ; 7 protarsal 



and 3 tibial spines on first and second 



leg excelleus, Poc, $ . 



b 2 . Hands strongly keeled ; about 9, rarely 



12, pores on lower side of brachium, 



9-12, rarely 15, on the hand; smaller, 



except hopturus, less than 90 mm. in 



length, carapace not exceeding 12 mm. 



in hopturus, usually less than that ; 



4-6 protarsal spines on first and second 



legs ; carapace laterally granular. 

 a 3 . Upper keels of caudal segments 1-4 



Ann. & Mag. N. Hist. Ser. 7. Vol. ii. 5 



