112 Mr. R. I. Pocock on some 



abdomen 10*5, width 8'5 ; length of first leg (from base of 

 femur) 15, of second 18, of third 12-5, of fourth 16, of palp 

 12 ; width of mandibles at base 4*5 ; length of sternum 5, 

 width 3. 



Loc. Perth, W. Australia (77. W. J. Turner). Mr. Cam- 

 bridge's specimen was from the Swan River (Perth). 



In spite of the fact that its eyes are arranged as in Simon's 

 group Idiopese of the subfamily Ctenizinae, this genus is 

 without doubt to be referred, not to that section, but to the 

 Cyrtauchenieaj, as its scopulate and weakly spined tarsi and 

 protarsi indicate. From all the genera of Cyrtauchenieae, 

 however, it may be recognized by the arrangement of its eyes, 

 as well as by the posteriorly truncate, hardish, wrinkled- 

 skinned abdomen — a feature in which it presents resemblances 

 to Chorizor)s and Cyclocosmia, both of which, however, 

 present an entirely different eye-formula. 



Genus Aganippe, Cambr. 



Aganippe, Cambridge, Ann. & Mag. Nat. Hist. (4) xix. p. 28 (1877) ; 

 Simon, Hist. Nat.' Araign^es, i. p. 103; Pocock, Ann. & Mag. Nat. 

 Hist. (6) xvi. p. 223 (1895). 



Type Aganippe subtrtsti's, Cambr. ibid. pi. vi. fig. 3. 



In spite of the differences observable between them in the 

 arrangement of the eyes and the structure of the abdomen, 

 the genera Aganippe and Idiosoma cannot, I think, be far 

 separated in a natural classification of spiders. 



Apart from the two characters just mentioned, the principal 

 differences between them seem to be as follows : — 



The scopulas on the palpi and on the first and second legs 

 are thicker, and these appendages are armed with fewer 

 spines; for example, the tibia of the palp has two pairs at 

 its apex and the tarsus one externally at the base ; the tibia 

 of the first leg is practically without spines, though some of 

 the setje are thickened ; on the protarsus there are 2 or 3 

 apical spines and 1 external basal spine ; on the second leg 

 there are also a few spiniform setJB intermixed with the 

 bristles on the tibia, while on the protarsus there are 4 apical 

 spines and about 3 long spines on the inner surface; the 

 tibiae of the third and fourth legs are at most weakly spined 

 below, while the protarsi are somewhat strongly spined both 

 below and in front, while the tiljia and protarsus of the third 

 are also spined above posteriorly ; the tarsi of all tlie legs are 

 spiny below, those of the first, second, and tiiird at the tip, of 

 the fourth posteriorly as well. The third and fourth legs are 

 noticeably stouter than the first and second, the diflference 

 being much greater than in Idiosoma. 



