524 OS AEACnNIDS FROM BBITISH EAST AFRICA. [Jime 21, 



flagellum much longer and projecting back on to the head some 

 distance past the ocular tubercle (in jolmstoni it only reaches the 

 tubercle), and in the much greater thickness of the upper fang, 

 which though pointed at the apex is strongly elevated and convex 

 above ; moreover there is a distinct notch just in front of the first 

 tooth; in the lower fang there is one large rounded tooth showing 

 indistinct division into three, the posterior of which stands up 

 as a triangular denticle. In jolmstoni, this triangular tooth is 

 relatively very much larger, and the other two are much smaller 

 and more distinct ; and in the upper jaw the terminal fang is 

 slender (it is represented as too thick in fig. 1, p. 254, of my 

 paper quoted above) and is lightly curved. 



The legs and palpi of this species are also a little longer than in 

 C. joJinstoni. 



Measurement'^ in millimetres. — Total length 16 ; length of 

 mandible 4 ; width of head 3'8 ; length of palp 12, its tibia 4, 

 tarsus and protarsus 5 ; 4th leg 19, its tibia 5, protarsus 3*5. 



Loc. Samburu. A single male example. 



The type of this species may prove to be the male of C. ornatum 

 of Karsch, based upon a female 22-23 mm. long from Masailand. 



EXPLANATION OF THE PLATES. 



Plate XLI. 



Fig. 1. Pterinochilits spinifer, sp. n., c?, p- 502. Palpal organ, external view. 



1 a. „ ,, Anterior leg. 



2. Pisenorodes hbhneli (Sim.), d" > P- 505. Distal segments of palp, external 



■view. 



2 a. „ „ Anterior leg. 



2 b. „ „ Tibial spur of anterior leg. 



3. Araneus eresifrons, sp. n., $ , X 2, p. 509. 



3 a. „ „ Vulva from the side. 



3 b. „ „ Vulva from below. 



4. „ hettoni, sp. n., 2, X I, p. 510. 



4 a. „ „ Vulva from tbe side. 



5. „ tariiensis, sip.n.,]y.^l\. Vulva. 



6. Argiope aurocincta, sp. n., p. 512. Vulva from below. 

 a. „ ,, Vulva from bebind. 



7. CcBrostris nodulosa, sp. n.. p. 514. Vulva. 



8. Thalassivs margaritatus, sp. n., $, X %, V- 518. Extended on a reed. 



9. Sparassus bicorniger, sp. n., p. 519. Tibial processes of palp of male. 



Plate XLIL 



Fig. 10. Araneus taruciisis, sp. n., 2 , X 2, p. 511. 



11. Argiope aurocincta, sp. n., $, X 2, p. 512. 



12. Poltgscorticosm, sp.n., -p. 513. Lateral view of cephalothorax and 



abdomen. 

 12 a. „ ,, Anterior view of cephalothoras and abdomen. 



13. Siegodyphiis lineifrons, sp. n., p. 516. Vulva. 



14. Biton tigrinum, sp. u., (^, X 3, p. 522. 



14 a. „ ,, Inner surface of mandible. 



15. Zeriassa spinulosa, sp. n., p. 521. Inner view of mandible of male. 



16. Ceroma variatum, sp. n., p. 523. Inner view of mandible of male. 



