732 MB. B. I. POCOCK OS ETHIOPIAN SPIDEBS. [June 15, 



4th 23 ; patella and tibia of 4th 8-5, of Ist 7-5 ; protarsus and 

 tarsus of 4th 8. 



Loc. Kinyamholo, Lake Tanganyika. 



Two female examples. 



The males of the genus Acanthodon differ so strikingly from the 

 females that unless taken during courtship it is almost impossible 

 to compare them together. From its distribution A. meadii might 

 be the S of A. lamstris, but would seem to be considerably too 

 large ; for whereas the males of nearly all spiders are smaller than 

 the females, the type of meadii exceeds that of lacustris, the cara- 

 pace.measuring 12 mm. in length as compared with 10"5. Allowing 

 for differences owing to drying, the eye-formula seems to be practi- 

 cally the same in the three species. The male of thorellii may, 

 however, be at once recognized from that of meadii by having the 

 carapace smooth instead of coarsely granular, and by its much 

 smaller size, the carapace measuring only about 4 mm. in length. 



The following tuo species are unknown to me : — 

 Idiops compactus, Gerstaecker in Yon der Decken's Eeisen in Ost- 

 Africa, iii. ii. p. 484 (1873), based upon a female example from 

 Dafeta (Kilimanjaro), is referable either to the genus Acanthodon 

 or Heliymomerus. 



Idiops aussereri, Simon, Bull. Soc. Zool. France, 1876, p. 223, 

 from Landana on the Congo, is compared with A. meadii, Cam- 

 bridge ; but said to differ from all the known species of Idiops in 

 possessing sioj (instead of four) spinning-mammillae I ! 



The following genera and species from Africa belonging to the 

 Ctenizidee are unknown to me : — 



Acontius hartmanni, Karsch, SB. Ges. nat. Fr. Berlin, 1879, 

 p. 64. Loango. 



Aporoptyclius afrimnus, Simon, Act. Soc. L. Bordeaux, xlii. 

 p. 405 (1889). Landana, Congo. 



AncylotryjM fossov, id. loc. cit. p. 406, Landana, Congo; and 

 spinosa, p. 407, Port Elizabeth. 



Cyrtauchenius zebra, Simon, Ann. Soc. Ent. France, Ixi. p. 272 

 (1893). Zululand. 



Homostola vulpecula, id. loc. cit. p. 271. Zululand. 



Hennacha caudata, id. Act. Soc. L. Bordeaux, xlii. p. 408. Dela- 

 goa Bay. 



Spiroctenus personatus, id. loc. cit. p. 409. Delagoa Bay. 



The first of these, namely Acontius hartmanni, is not satis- 

 factorily diagnosed for classification. The second and third, namely 

 Aporoptychus and Ancylotrypa, ave referred by Simon to the section 

 Aporoptychea: of his subfamily Ctenizinae, characterized by haxang 

 the maxillae nearly square as in Actinopus and Eriodon, and two 

 pairs of small marginal sigilla opposite the 2nd and 3rd pairs of 

 legs, the terminal segment of the spinning-mammillae long and 

 acuminate, while all or some of the feet have the claws biserially 



