864 MR. R. I. POCOOK ON SCORPIONS, PSDIPALPS, [NoV. 14, 



3 pairs of inferior spines, 2 behind, 2 in front, and 1 above ; 

 femora serially spined above. 



Abdomen oval, as wide as high, not twice as long as broad. 

 Vulva as in figure. 



Measurements in millimetres. — Total length 30 ; length of cara- 

 pace 13, width 10 ; length of ocular area 3, posterior width 4 ; 

 length of palpus 16, of Ist leg 52, of 2nd 51, of 3rd 39, of 4th 48 ; 

 patella and tibia of 1st 19-5, of 4th 17. 



The two known species of this genus, P. canescens and P. vulpina 

 Simon (Ann. Soc. Eut. Belg. xlii. p. 10, 1898), from the Congo, 

 are too briefly described to be identifiable. Both are smaller than 

 P.ferox, P. canescens being 20 mm. long and P. vulpina 22 mm. 



Genus Thalassius Simon. 



Thalassius guineensis (Lucas). (Plate LVIl. fig. 18.) 



Olios guineensis, Lucas in Thomson's Arch. Ent. ii. p. 405, 

 pi. xiii. fig. 6 (1858). 



2 . Colour. Carapace with narrow black rim, covered above and 

 laterally with a mixture of white and brown hairs, sometimes the 

 white predominating, sometimes the brown ; no distinct white 

 marginal or submarginal band; the clypeus the same tint as the sides 

 of the head ; abdomen a deep rich-brown or greyish brown above, 

 darker behind than in front, covered with a mixture of whitish and 

 reddish-brown hairs, sometimes the white, sometimes the brown 

 predominating ; ornamented with four pairs of symmetrically - 

 disposed blood-red patches, the posterior patches often indistinct ; 

 no lateral pale band ; lower surface tolerably uniform yellowish 

 brown ; legs a tolerably uniform greyish or brownish hue, not 

 banded ; the protarsus sometimes darker at the tip. 



Carapace just about equal to tibia of 1st and to tibia and pro- 

 tarsus of 4th leg ; longer by about one-fourth of the tarsus than 

 metatarsus of 1st ; its upper surface flat, as high behind as in front. 



Legs robust, thickly plumose, 4, 1 and 2, 3 in length ; patella 

 and tibia of 4th a little less than those of 1st, and distinctly 

 less than those of 2nd. 



Lateral lobes of vulva long, oblique, converging posteriorly and 

 meeting in a short median suture ; the depression between them 

 semioval, widely open in front, and filled in with a completely 

 chitinous irregular sclerite (see Plate LVII. fig. 18). 



6 . Resembling $ in colour ; legs much longer, but equally 

 strongly plumose. Palp when extended not reaching apex of 

 femur of 1st leg ; its tibia subcylindrical, unarmed ; tarsus piri- 

 form, shorter than patella and tibia taken together. 



Measurements in millimetres. — $. Total length 24; length of 

 carapace 11, of 1st leg 42. 2nd leg 42-5, 3rd leg 39, 4th leg 44. 



d" . Total length 22 ; length of carapace 10, of 1st leg 52, 2nd 

 52-5, 3rd 48, 4th 54. 



Loc. Benito Eiver {G. L. Bates). 



This species has apparently not been rediscovered sin ce Luca 



