new African Theraphosoid Spiders. 491 



the Niger (P. Z. S. 1899, p. 844), and like that species in 

 presenting a shallow transverse groove in front of the fovea, 

 but certainly differing in the much greater inequality in 

 length between the first and fourth legs. In H. hercules the 

 first leg falls short of the fourth by nearly half the length of 

 the tarsus of the fourth, whereas in H. scppticus it falls short 

 by more than the length of the tarsus ; the fourth leg in 

 H. hercules is exceptionally short, its patella and tibia being 

 less than those of the first. 



Measurements in millimetres. — Total length 63 ; length of 

 carapace 32, its width 27 ; first leg 74*5, second 63, third 60, 

 fourth 86 ; patella and tibia of first leg 30, of fourth 31 ; 

 tarsus and protarsus of fourth 31; femur of fourth 24*5, its 

 height 7 ; tibia 17*5, its width 5. 



Loc. Island of St. Thomas in the Gulf of Guinea (Moc- 

 querys coll.). 



Hysterocrates apostolicus } sp. n. 



? . — Resembling II. scepticus in having the tarsus of the 

 palp normal, but distinguishable by the much greater length 

 and strength of the fourth leg. 



Fourth leg strong, rather thicker than the first, the femur 

 three times as long as high (22 : 7), the tibia a little less than 

 three times as long as wide (16 : 5'5) ; height of tibia equal 

 to that of patella; the patella and tibia or protarsus and 

 tarsus are very noticeably longer than the carapace, the whole 

 limb surpassing the first leg in length by its tarsus and one 

 third of its protarsus. 



Carapace about equal to patella and tibia of first leg and 

 to patella, tibia, and tarsus of palp ; no transverse groove in 

 front of the fovea. 



Measurements in millimetres. — Total length 51; carapace 

 25 - 5, its width 22 ; length of first leg 62*5, of second 53, of 

 third 52, of fourth 79; patella and tibia of first 25, of fourth 

 28 ; protarsus and tarsus of fourth 28'5. 



Loc. Island of St. Thomas in the Gulf of Guinea (Moc- 

 querys coll.). 



Of the species that occur on the mainland, II apostolicus 

 approaches II. gigas, Poc. (P. Z. S. 1897, p. 762, and 1899, 

 p. 845), from the Cameroons, and H. laticeps, Poc. (pp. cit.), 

 from Old Calabar. From the former it may be recognized by 

 its broader carapace and by having the carapace shorter 

 instead of longer than the patella and tibia or protarsus and 

 tarsus of the fourth leg; from the latter by having the patella 

 and tibia of the fourth greater than of the first leg instead of 



