492 NEW YORK STATE MUSEUM 



6 A transection near the base of the caudal spines 



7 A transection tlirongli tlie cepbalis end of a cuticular pocket 



8 A sagittal section tbroug-h the base of a caudal spine and its cuticular 



pocket laterad of the spiracular opening 



9 A transection of a cuticular pocket taken at about the level n-o of 



figure 8 



10 A transection through the spiracular opening 



11 A transection taken caudad of the spiracular opening 



12 A ti-ansection of a cuticular pocket, showing its connection with a 



trachea 



13 A transection of a cuticular pocket taken cephalad of the spiracular 



opening 



14 A section through the transverse connection of the tracheal trunks and 



the dorsal apodeme 



15 A portion of the hypodermis and some cuticular plates greatly enlarged 

 IG Some cuticular plates still more enlarged 



17 A sagittal section through the apex of the abdomen of a mature larva 

 mesad of a spiracular opening. 



PLATE 29 



Donacia 

 Setal arrangement of the larvae 



1 Donacia cincticornis 



2 ij o n a c i a p a 1 m a t a 



3 Donacia subtilis 



4 Donacia porosicollis 



PLATE 30 



Donacia and Haemonia 

 Setal arrangement of the larvae 



1 D o n a c i a a e q u a 1 i s 



2 Donacia emarginata 



3 Haemonia n i g r i c o r n i s " 



Anatomic details of Donacia p a 1 m a t a 



4 Lateral view of the abdomen of the adult female 

 5' Dorsal view of the same 



6 Portion of a rhizome of N y m p h a e a a d v e n a , showing the at- 

 tachment of the cocoon 



PLATE 31 



The food plant, B r a s e n i a p e 1 1 a t a , and transformations of 

 G a 1 e r u c e 1 1 a n y m p h a e a e . Drawn by Miss Anthony 



PLATE 32 



Simulium territory 

 A little fall in the bottom of Cascadilla gorge. 



PLATE 33 



Simulium meridionale 



1 Mandible of larva. xllO 



2 Maxilla of larva. xllO 



3 Hypopharynx of larva. xUO 



4 Labium of larva. xlOO 



5 Respiratory filameuts of pupa. x40 ' 



