419 



In pairing, the pntputial sack of the male is entirely re- 

 versed, what is its bottom in a rest-position (text-fig. 24) becom- 

 ing the apex in copulation (text-fig. 27). The proximal bar 



od 



clu 



ors — *''8 



Fig. 27. — Genital armature of Arixeiiia jacobsoni ^ thrown out from the 

 praeputial sack. B^ B-, B^, B*, the four sclerites ; par, paramere ; le, lever of 

 same ; de, apex of ejaculatory duct ; od, the point where the duct leaves 

 the armature. 



Fig. 28. — Tails of ^ and Ç Arixenia jacobsoni in copula, tg, tcrgite lo ; 

 clu, clutch ; o.od, orifice of oviduct ; o.rs, orifice of reccptaculum scminis 

 St. 8, sternite s. 



B^ is now tiie most distal one ; it lies during copulation (text- 

 fig. 28) within the slit between the two halves of the eighth 

 sternite (st. 8) of the female, and its hook catches the concave 



