1898.] BV MR. c. s. BET'^o^' ix British east africa. 507 



leg spined like the 1st, with oue or two shorter protarsal spines ; 

 3rcl leg with patella rather thickly spiny in front, bristly above, 

 with 1 posterior apical spine, tibia with 2 spines in front, 2 behind, 

 4 above ; protarsus with 2, 2, 3 spines below and about 14 spines 

 above — 5 forming an anterior, 8 a posterior series, and 1 median 

 dorsal ; tarsus with 1, 1 spioes above ; 4th leg with tibia bearing 1 

 posterior spine and a few setiform spines below, its protarsus armed 

 with numerous spiiies in front below, those at the apex being long 

 and strong, and two spines behind, one median, one apical ; tarsus 

 with many short spines on the anterior side of the lower surface. 

 Claws with two rows of strong teeth, those of the 3rd and 4th 

 legs less strongly toothed than those of the 1st and 2nd. Mamillce 

 longish, the apical segment acuminate, but little shorter than the 

 second. 



Measuremmts in millimetres. — Total length of trunk 18 ; length 

 of carapace 8 ; width 5'5 ; length from fovea 5 ; length of palp 11, 

 of 1st leg 17, of second 14-5, of 3rd 11, of 4th 18-5, patella and 

 tibia of l8t 7, of 4th 8. 



Loc. Voi. A single female example. 



The generic position of this species must at present be left 

 unsettled. In a general sense it falls under Cyrtauchenius as 

 defined by Simon. In the structure of the mamillse it seems to 

 resemble 0. zebra oi Simon, from Zululand (Ann. Soc. Ent. France, 

 Ixi. p. 272, 1893), but in other characters, such as size of eyes, 

 spine-armature of anterior tibia and of 3rd tarsus, it approaches 

 C. terricola. 



Genus Acanthodon Guerin. 



ACANTHODON ROBUSTUS, sp. U. 



Colour of carapace brownish yellow ; legs darker, with fuscous 

 longitudinal stripes ; inner surface of femora of palpi and first two 

 pairs of legs pale yellow. 



Length of carapace exceeding that of tibia and protarsus of 4th 

 leg (in lacustris it is greater). Ocular arrangement almost as in 

 lacustris \ but the ocular area shorter, the width across the tubercle 

 exceeding the length from the posterior border of the tubercle to 

 the anterior tubercle of the anterior lateral eyes (in lacustris the 

 length of the area slightly exceeds the width of the tubercle) ; width 

 of ocular area at least half the length of the 4th protarsus. 



Labium with a transverse row of 4 or 5 spicules. 



Legs and palpi spined as in lacustris, but the spines are more 

 numerous ; moreover the posterior side of the tibia of the 2nd leg 

 is armed with strong short spines, and on the anterior side of the 

 patella, tibia, and protarsus of the 3rd leg the spines are arranged 

 closely together, forming distinct band-like areas ; whereas in 



' By an error in the description (P. Z. S. 1897, p. 731) the anterior median 

 eyes are described in lacustris as being separated by a space exceeding twice their 

 diameter : the distance is about equal to a diameter ; and the distance between 

 these eyes and the posterior laterals is equal to about twice the diameter of the 

 former. 



