PLATE III. 



Genus HISTIOSTOMA. 



Fig. 1. Histiostoma rostro-serratum. Maxillary lip 

 and trophi of ? seen from below, X 500. 



2. Histiostoma rostro-serratum. Mandibles of ? 



seen from the side, X 500. 



3. Histiostoma rostro-serratum. First right leg of 



$ from below and the inner side, X 275. 



4. Histiostoma rostro-serratum,. Second leg of < 



from the side, X 275. 



5. Histiostoma rostro-serratum. Third right leg 



of 3 from below and the inner side, X 275. 



6. Histiostoma rostro-serratum. Fourth right leg 



of 3 from below and the inner side, X 275. 



7. Histiostoma rostro-serratum. First leg of ? 



from side, X 275. 



8. Histiostoma rostro-serratum. Second leg of ? 



from side, X 275. 



9. Histiostoma rostro-serratum. Third leg of ? 



from below, X 275. 



10. Histiostoma' rostro-serratum. Fourth leg of ? 



from below, X 275. 



11. Histiostoma rostro-serratum. Vulva from 



below, X 400. 



12. Histiostoma rostro-serratum. One labium of 



vulva from the side, X 400. 

 18. Histiostoma pulclirum. Mandible, X 800. 



14. Histiostoma pulclirum. Second claw of <J , X 



400. 



15. Histiostoma pulclirum. Second spine from left 



side of abdomen of 3 , X 800. 



16. Histiostoma pulclirum. Spine from the posterior 



margin of 3 , X 800. 



17. Histiostoma pidclinun. Penis from below, X 



800. 



18. Histiostoma pulclirum. Hood of rostrum of 



Hypopus, X 300. 



19. Histiostoma pyriforme. Mandible, x 800. 



