730. MB. B. I. POCOCK ox ETHIOPIAN SPIDEKS. [Junel5, 



Heligmomebus caesonii, sp. n. 



Closely allied to H. somalicus, Poc, but with the ocular area more 

 compact,' the posterior lateral eyes separated from the median 

 laterals by a space which is less thau the diameter of the latter, and 

 the distance between the anterior median and posterior lateral not 

 nearly twice as great as the distance bet\Aeen the anterior medians ; 

 distance between anterior medians equal to nearly twice their 

 diameter; anterior lateral eyes closer to the rest, the tubercles 

 that bear them more widely separated, the distance between them 

 equal to the diameter of an anterior median eye, the oblong area 

 formed by these eyes and the anterior medians a little longer than 



wide, 



Mandible armed below internally with 7 (o large and 2 small) 

 teeth, externally with 4 ; labium w ith an irregular marginal series 

 of 4 teeth and about 2 behind it. 



Sternal sic/ilia situated as in somalicus but smaller. Spine arma- 

 ture of legs practically as in somalicus, except that there is no 

 anterior spine on the tibia of the 4th leg. 



Meamrements in millimetres. Total length 14 ; length of carapace 

 5-5, of palp 7, of 1st leg 9, of 2nd 9-5, of 3rd 9-5, of 4th 12 ; 

 patella and tibia of 4th 4*8 ; patella, tibia, tarsus, and protarsus of 

 1st 6, of palp 5. 



Loc. Niomkolo, Lake Tanganyika {A. Carson). A single female 

 specimen. 



This specimen is perhaps not quite mature, and the differences 

 it presents from the type of somalicus may be attributable to 

 differences of age. But since there is no e\idence of this fact and 

 since the localities are A\idely separated, it is right to regard them 

 as of specific value. Briefly the two forms may be distinguished 

 as follows : — 



a. Distance between posterior lateral and posterior median 

 eyes at least as great as the diameter of the latter ; 

 distance between anterior median eyes about equal to 

 their diameters; the tubercles bearing the anterior 

 lateral eyes close together, the distance between them 

 less than the diameter of an anterior median eye somalicus, Poc. 



h. Distance between posterior lateral and posterior median 

 less than the diameter of the latter ; distance between 

 anterior medians greater than their diameter ; ocular 

 tubercles separated by a space which about equals the 

 diameter of an anterior median eye carsonii, sp. n. 



Genus Acanthodox, Guerin, 



Guerin, Eev. Zool. 1838, p. 10 ; Simon, Hist. Nat. 

 Araignees, i. p. 91 (1892). 



AcANTHODON MEADii (Cambr,). 



Idiops meadii, Cambridge, Proc. Zool. Soc. 1870, p. 152, pi. viii. 

 fig. 4. 



A single specimen (type) from East Africa (Capt. Spelce). 



