22 MB. F. O. PICKARD CAMBEIDGE 03f THE [Jan. 1 8, 



only a single lateral spine on inner basal half of tibia, and no dorsal 

 tibial spines, while the single small apical central inferior protarsal 

 spine is absent. 



Vulva. For form of this organ, see Plate III. fig. 6. 



The single female specimen from the Cameroons is obviously of 

 a different species, so far as the material at hand enables one to 

 judge, from the male taken by Capt. Burton in the same district. 

 The ej'e-formula approaches more nearly tliat of carsoui, and though 

 it differs again from this species in this respect one must not speak 

 too confidently of differences which are possibly only sexual. 

 That this form is, however, specifically distinct from carsoni, I 

 have not the smallest doubt. The specimen described above was 

 taken by Miss Kingsley. 



Ctenus occiDEXTALis, sp. H. (Plate III. fig. 8.) 



2 . 32 mm. Hah. W. Africa. Type in coll. Brit. Mas. Nafc. 

 Hist. London. 



$. Total length 33 mm. Carap. 15x11. Legs 4, 1, 2, 3— 

 i. 53-5— ii. 50— iii. 42— iv. 57. Pat.+tib. i. 18— iii. 13-5- iv. 17. 

 Prot. i. 12— iv. 15. 



2 . Colour. Carapace and legs mahogany-broun, clothed with 

 short dull golden-yellow pubescence, no fringing hairs, or very few. 

 Mandibles black throughout. Abdouien clothed with dull golden- 

 yellow pubescence, with double series of 5-6 dorsal dark spots. 

 Sides striped with longitudinal rows of pale spots. Ventral area 

 with two short whit^i stripes at the genital rima, and a long 

 broken white stripe on each side reaching to the spinners. These 

 stripes and spots are much more distinct than in C. Jcingslei/i. 



Structure. Carapace horizontal, slightly gibbous behind, abruptly 

 inclined to base. 



Eyes. Second row straight by anterior margins. Diameter of 

 centrals 3 times transverse diameter of laterals, | a diameter apart, 

 g from laterals. Posterior laterals ^ smaller (by diameters) than 

 centrals, I5 diameters from them. Ocular quadrangle broader 

 than long, narrower in front ; posteriors g lai'ger, anteriors | a 

 diameter apart, | a diameter from posteriors. Clypeus scarcely 2 

 diameters of anterior central eye. Lower margin of fang-groo\e 

 with four stout teeth, upper with three. 



Spinulation of legs. Similar to that of S C. carsoni, but with 

 single lateral spine on inner side of basal half of tib. i., 1 — 1 on 

 inner basal side of tib. ii. jN^o dorsal tibial spines and no single 

 short apical inferior protarsal spine. 



Vulva. See Plate III. fig. 8. 



A single female was taken in W. Africa, hab. unknown. It 

 can with C. kingsleyi be distinguished from the large species from 

 East Africa by the absence of the protarsal apical spine, by the 

 black mandibles, and of course b)' the form of the vulva. From 

 C. kingsleyi it can be distinguished by its shorter legs, carapace 

 longer than pat. -|- tib. iii., and the more numerous and distinct 

 pale spots and lines beneath the abdomen ; the cusps on each side 



