Explanation of Plate 5. 



Fig. 

 I 



5 



Ctimacia dictifona Needham. 



Imago, lateral view, x 4. 



Imago, dorsal view, x 3. 



Larva, dorsal view, x 6. 



Pupal cases, in situ, natural size. 



One of the same, enlarged, showing the hexagonal meshes of the outer covering. 



N^iSYi'a ambrata Needham. 



6. Imago, lateral view, x 4. 



7. Imago, dorsal view, x 3. 



8. Two newly formed pupae, lateral and ventral views, x 6. 



9. Macronychus glabratus Say (Coleoptera : Parnidae) ; an associate of the sponge 



fly larvae, on submerged timbers. 



10. Fresh-water sponges (Spongilla ? fragilis Leidy) in situ, with the sponge fly 



larvc'e crawling about over them. 



11. Two pupal cases of S. umbrata, showing the closely woven outer covering, nat- 



ural size. 

 522 



