Fig. 20. Histiostoma pyriforme. The two terminal 

 joints of the palpus, X 250. 



21. Histiostoma pyriforme. First leg of ^ , X 300. 



22. Histiosiomci pyriforme. Second leg of < , X 



300. 



23. Histiostoma pyriforme. Third leg of d , x 



300. 



24. Histiostoma pyriforme. Fourth leg of $ , X 



300. 



25. Histiostoma pyriforme. One of the four discs 

 from the ventral surface, X 500. 



