212 Journal New York Entomological Society, t^o'- xxiii, 



Limnephihts combinatus Walk. 



Larva. 



Fig-. 14. Labrum. 



Fig. 15. Diagram of left side of abdomen, segments one to eight, indi- 

 cating position of gills.i 



Fig. 19. Labium and maxilla, in part. 

 Fig. 22. Frons. 



Pupa. 



Fig. 20. Chitinous plates of the left side of dorsal surface of abdomen. 

 Numbers indicate the segments on which they occur.2 



Limnephiliis indivisus Walk. 



Larva. 

 Fig. 10. Labrum. 



Fig. II. Diagram of left side of abdomen, segments one to eight, indi- 

 cating position of gills.i 

 Fig. 21. Frons. 



Pupa. 



Fig. 12. Silken sieves from front and rear ends of case. 



Fig. 16. Chitinous plates of left side of dorsal surface of abdomen. 

 Numbers indicate the segments on which they occur.2 



Fig. 17. Appendage of one side of last segment of abdomen, ventral 

 view. Circles indicate positions of setae. 



Chilostigina difficilis Walk. 



Larva. 

 Fig. 2. Labium and maxilla, in part. 

 Fig. 6. Labrum. 

 Fig. 7. Frons. 



Fig. 9. Diagram of left side of abdomen, segments one to eight, indi- 

 cating position of gills.i 



Pupa. 

 Fig. I. Chitinous plates of the left side of dorsal surface of abdomen. 

 Numbers indicate the segments on which they occur. 

 Fig. 18. Mandible, side and back views. 



1 The presence or absence of gills on the first and last segments on which 

 they occur is subject to some variation. Also the number of gills in a cluster 

 may vary within certain limits. The numbers near the black spots represent- 

 ing gills indicate the approximate number of gills in the cluster. 



2 The number of hooks on each plate and even the shape of the plate 

 itself, is subject to variation. The form 01 the chitinous portion of the first 

 abdominal segment is a more constant character than the chitinous plates 

 of- the succeeding segments. 



