514 MR. U. I. POCOCK ON THE ARACHNIDS COLLECTED [June 21, 



tawny brow u, femora oi anterior legs deep reddish, with a steel- 

 blue anterior distal band ; femur of 3rd leg with the steel band on 

 the posterior side ; of 4th almost entirely steel-blue, the distal end 

 only pale ; patella of 2nd, 3rd, and 4th brown below, of 1st paler 

 coloured ; tibise \a ith a black or deep brow n spot at the distal end 

 below, also with a median spot, stronger on those of the 2nd and 

 3rd pairs ; protarsi with two broad bands on the distal half of the 

 lower surface, which on the 3rd and 4th pairs fuse into a continuous 

 broad black band : tarsi black at the distal end below ; upperside 

 of legs fi'om patella to tarsus clothed M'ith greyish-yellow hairs, 

 indistinctly variegated with brownish spots, which take the form 

 of definite bands on the tarsi and protarsi and on the distal end of 

 the tibia and patella of the 4th and less distinctly so of the 3rd ; 

 epigastric region of abdomen and an area of corresponding size 

 above and at the sides of the pedicel black ; upperside of abdomen 

 rusty brown, with a deep chocolate patch in the centre ; the sides 

 and tubercles silvery yellow, variegated with lights and shades ; 

 lower side of abdomen behind epigastric fold yellowish brown. 



Carapace a little longer than patella and tibia of 3rd leg, a little 

 shorter than those of 4th; ocular quadrangle nearly square, its 

 length considerably less than height of clypeus. 



Abdomen nearly parallel-sided, with rounded posterior end, 

 moderately high, its upper surface tolerably flat in the middle but 

 beset with varying sized tubercles, furnished anteriorly with three 

 large tubercles, one in the middle line, and a considerably larger 

 one on each side, which are themselves beset with smaller tubercles. 



Measurements in millimetres. — Total length 12 ; length of cara- 

 pace 6-5, width 5 ; length of 1st leg 22, 2nd 21, 3rd 15, 4th 18 ; 

 length of abdomen from base of median tubercle 9, width 7, height 

 from lower side of pedicel to base of lateral tubercle 6. 



Loc. Maziwa Mitatu in the Taru desert. 



This species falls into the section of w-hich P. illepidtts 0. Koch 

 is an example, and is perhaps allied to the W. African P. mon- 

 strosus Simon, which is unknown to me. 



Genus Cjeeostris Thorell. 



C.EROSTKIS NODULOSA, sp. n. (Plate XLI. fig. 7.) 



Colour. Carapace black, or reddish brown in j'ounger specimens, 

 its posterior slope reddish brown ; cephalic region covered with a 

 clothing of whitish hairs, intermixed here and there wilh yellow 

 or mostly yellow, mottled greyish patches at the sides and along 

 the middle line ; mandibles black or brown, covered with yellowish- 

 brown hairs intermixed with white ; upperside of legs from 

 patella to tarsus covered with silvery white hairs, vai'iegated with 

 patches of yellow or yellowish grey, the darker patches being 

 traceable upon the distal end of the patella, tibia and protarsus, 

 and even the middle of the tarsus ; on the 3rd and 4th protarsus 

 tlie darker patch is in the middle of the segments ; femora naked, 

 except at the distal end, and in maturer forms steel-blue in colour ; 



