On some new African Theraphosoid Spiders. 489 



rather belongs to the so-called Silico-Flagellatae. I have 

 found this same form in California and in the Mediterranean. 



EXPLANATION OF PLATE XVI. 



Figs. 1, 2. Chatoceros incurvus, Bail. Eadocysts. 



Figs. 3-7. Chcetoceros chinchce, Mer. Endocysts. (Fig. 6 in a somewhat 



oblique position ; fig. 7 in profile.) 

 Fig. 8. Skeletonema costatum, var. spiralis, Mer. 

 Figs. 9, 10. Intermediate forms between Bicldulphia (Triceratium) alter- 



nans, Bail., and varietas variabilis, Bright w. The puncta are not 



represented. 

 Figs. 11, 12. Asteromphalus malleus (malleiformis), var. pacifica, Mer. 



900 



T' 

 Fig. 13. Asteromphalus malleus {malleiformis), Wallich, reproducing the 



figure of Wallich. *52. 



Fig. 14. Navicula Hennedyi, var. subrostrata, Mer. 

 Fig. 15. Another variety of N. Hennedyi from Tahiti. 

 Figs. 16-21. Spermatogonia antiqua, Leud. & Fortm. 



LXVI. — Some new African Theraphosoid Spiders in the 

 British Museum. By R. I. POCOCK. 



Family Theraphosidae. 

 Subfamily Eumenopeorinje, Poc. 



Genus Hysterocrates, Sim. 



A few weeks ago the Trustees of the British Museum 

 acquired by purchase seven large Theraphosoid spiders which 

 were captured on the island of St. Thomas in the Gulf of 

 Guinea, and were offered to the British Museum under the 

 name Selenocosmia Greeffi of Karsch. Who may be respon- 

 sible for the identification I know not, but examination 

 showed the specimens to be referable to three perfectly distinct 

 species, neither of which is identical with the species described 

 by Karsch, if any reliance is to be placed on the description of 

 the latter. 



The species may be described as follows : — 



Hysterocrates didymus, sp. n. 



? Phoneyusa Greeffi (Karsch), Simon, Hist. Nat. Araign^es, i. p. 153 

 (1892). 



? . — Colour. Integument deep blackish brown, hairy 

 clothing a rich ruddy olive-brown, with paler tips to the 



