492 NEW YORK STATE MUSEUM 



6 A transection near the base of tlie caudal spines 



7 A transection tlirougli the cephalis end of a cuticular pocljet 



8 A sagittal section through 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 ra-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 conneotion with a 



trachea. 



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



opening 



14 A section through the transverse connection of (he tracheal ti'unks and 



the dorsal apodeme 



15 A portion of the hypodennis and some cuticular plates greatly enlarged. 



16 Some cuticular plates still more enlarged 



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



mesad of a spiracular opening. 



PLATE 29 



Donacia 



Setal arrangement of the larvae 



1 Donacia cincticornis 

 2jjonaeia palmata 

 SDonaciasubtilis 



4 Donacia porosicollis 



PliATE 30 



Donacia and Haemonia 



Setal arrangement of the larvae 

 IDonaciaaequalis 



2 Donacia emarginata 



3 Haemonia nigricornis 

 Anatomic details of Donacia palmata 



4 Lateral view of the abdomen of the adult female 



5 Dorsal view of the same 



6 Portion of a rhizome of Nymphaea advena, showing the at- 



tachment of the cocoon 



PLATE 31 



The food plant, Brasenia peltata, and transformations of 

 G a lerucella nymphaeae. 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. xllO 



4 Labium of larva. xl90 



5 Eespiratory fila-ments of pupa. x40 



