neio Tropical and Southern Opiliones. 439 



Dorsal scute very finely and closely granular, the segments 

 marked by transverse rows of small spicules ; a few spicules 

 on the sides of the carapace and many more in front, those in 

 front of the tubercle arranged in two rows uniting behind 

 midway between the tubercle and the anterior border, an 

 isolated denticle in the middle of the lateral border. Ocular 

 tubercle armed on the summit with two pairs of largish 

 denticles, behind with one pair, and in front with two small 

 denticles on one side, four on the other, all pointing upwards. 



Mandibles unarmed except for three or four denticles in the 

 middle of the upperside of the first segment. 



Paljn unarmed ; inner surface of patella and tibia studded 

 with short erect hairs ; the distal angle of the patella rounded 

 and slightly produced. 



Legs with femora and patellse armed with serially arranged 

 spicules ; tibije compressed, quadrangular in section, with 

 hairy edges. 



Measurements in millimetres. — Total length 9 ; width of 

 head 4 ; length of palp 6 ; femur of first leg 4, second leg 7, 

 third 4, fourth 6 ; total length of first leg 20. 



Loc. British East Africa : El donyo eb Urru, on the 

 Mombasa-Uganda Eailway ( G. S. Betton) . 



This species may be at once distinguished from the South- 

 African species P. Leppana?, Poc. (P. Z. S. 1902, ii. p. 392), 

 by the much smaller dorsal denticles, the smoothness of the 

 coxre, the slight production of the inner apex of the patella 

 of the palp, &c. 



Family Trisenonychidse. 



Genus Sorensenella, Poc. 

 [Proc. Zool. Soc. 1902, ii. p. 409 (April 1903).] 



Sorensenella bicornis, sp. n. (PI. XI. figs. 3, 3 a.) 

 $ . — Colour. Body blackish, median area of scute clearer 

 reddish; palpi reddish; legs olive-black, obscurely ringed 

 with paler markings. 



Anterior portion of dorsal scute with a single long suberect 

 spike near its antero-lateral angle ; no tubercles on its ante- 

 rior border apart from those that project between and on each 

 side of the mandibles, and no spiniform tubercles above the base 

 of the second leg. Ocular spike higher than in S. prehensor. 

 First segment (carapace) of dorsal scute defined behind by 

 a conspicuous procurved groove; the second, third, fourth, 

 and fifth defined by feeble grooves and low tubercles ; the 



