492 NEW YORK STATE MUSEUM 



6 A transection near the base of the caudal spinea 



7 A transection through the cephalis end of a cuticular pocket j 



8 A sagittal section through the base of a caudal spine and its cuticular J 



pocliet latex'ad of the spiracular opening j 



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



figure 8 i 



10 A transection through the spiracular opening | 



11 A transection taken caudad of the spiracular opening j 



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 ti'unks and 



the dorsal apodeme i 



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

 IG Some cuticular plates still more enlarged I 

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



mesad of a spiraculai- opening. \ 



PLATE 29 



* Donacia 



Setal arrangement of the larvae 

 IDonaciacincticornis 

 2iJonaciapalmata 



SDonacia subtilis i 



4Donaciapo'rosieollis 



PLATE 30 



Bonacia and Haemonia j 



Setal arrangement of the larvae \ 



IDonaciaaequalis i 



2Donaeiaemarginata 



SHaemonianigricornis 



Anatopiic details of Donacia palmat a j 



4 I^ateral view of the abdomen of the adult female ] 



5 Dorsal view of the same 1 



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



tachment of the cocoon 



PLATE 31 I 



The food plant, Brasenia pel tat a, and transformations of j 



Galerucella nymphaeae. Drawn by Miss Anthony 



PLATE 32 



Simulium territory ] 



A little fall in the bottom of Cascadilla gorge. | 



PLATE 33 



Simulium nieridionale 



1 Mandible of larva. xllO 



2 Maxilla of larva. xllO 



3 Hypopharynx of larva. xllO 



4 Dabium of larva. xl90 



5 Respiratory filaments of pupa. x40 ' 



