22 Kqjlanatiooi of Plates. 



5. Two such membranes showing relative positions and mode 



of connection, x 4. 



6. Numbered diagram to show the order in which the eggs are 



arranged by the insect when constructing the case. 



7. Diagram of a longitudinal perpendicular section of the 



abdomen, showing the parts concerned in the formation 

 of the ootheca ; la to 10a dorsal plates of abdomen, lOa 

 being the upper oothecal plate ; Ih to lOb ventral plates 

 of the abdomen, 96 the lower oothecal plate ; r, colleterial 

 (or accessory) gland; /, intestine; o, oviduct; s, spermatheca 

 with twisted duct. 



8. Diagram of structures opening into the oothecal division of 



the cloaca ; a, line pointing to exit of intestine ; h, line 

 pointing to exit of ovidiict ; c, c, colleterial glands (of one 

 group, only the ducts are left) ; i, intestine ; o, ovaries 

 (tubes cut away) ; s, spermatheca. 



9. Ootheca of As2iidomorpha jnmcticosta ; diagram to show 



mode of closure of case below ; a, b, line of junction of 

 bottom of case : the parts above this line are supposed to 

 be seen in section (like Fig. 3), the parts below the line 

 show mode of arrangement of lower surface of the egg- 

 case and are in a plane at right angles with that above 

 the line a, h ; c, point of fold of a sectionized membrane ; 

 d, exposed part of a fold ; p, egg. 



Plate II. 



10. Ootheca oi Aspidomorplui confinis. 



11. Transverse section of same. 



12. Ootheca of Aspidomorpha tUjrina. 



13. Transverse section of same ; one or two of the outer mem- 



branes lifted. 



14. Ootheca of Basipta stolida on a twig. 



15. Transverse section of same ; /i, hole of twig. [In this figure 



the layer separating the two kinds of cells is not satis- 

 factorily shown.] 

 IG. A single membrane of same. 



17. Oothecal plates of the female Baslpla ; a, lower plate ; /». 



upper plate. 



18. Ootheca oi Cassida muirana, wiih covering of excrement; 



((, membranous margin, not covered with excrement ; /', 

 excrement. 



19. Transverse section of ^ame ; a and b, as in fig. IS. 



