AQUATIC INSECTS IN NEW YORK STATE 



491 



PLATE 24 



Sections of the stem of Sagittaria 



1 Cross section. 2 Longitudinal section, both showing intercelhilar 



spaces and aiTangement of tissues 

 3, 4 Eggs of Donacia porosicollis 



PLATE 25 



Donacia 

 Anatomic details of the larvae. Enlarged 



DONACIA CINCrriCORNIS 



1 Mandibles. 2 Antennae. 3 Leg. 4 Maxilla;. 



5 Labium. G Labrum 



7 Maxilla. 8 Antenna. 



DONACIA PALMATA 

 9 Lal)rum. 10 Eyes. 



DONACIA SUBTILIS 



13 Eye. 14 Leg. 15 Mandibles. 16 Maxilla. 

 10 Antenna 



PLATE 26 



Donacia 



Anatomic details of the larvae. Enlarged 



11 Mandibles. 12 Leg 



17 Labrum. 18 Labium. 



1 Mandibles. 

 '7 Antenna 



8 Mandibles. 



DONACIA POROSICOLLIS 

 2 Maxilla. 3 Labrum. 4 Labium. 



DONACIA AEQUALIS 

 9 Maxilla. 10 Antenna. 11 Labrum. 



DONACIA EMARGINATA 

 14 Antenna. 15 Labium. 16 Maxilla. 



5 Leg. 6 Eyes. 



12 Leg 



13 Labrum. 

 ■dibles 



PLATS 27 



Haemonia, Galerucella and Donacia palmata 

 Anatomic details of the larvae 



17 Leg. 18 Man- 



1 Mandibles. 

 Antenna 



8 Mandibles. 



HAEMONIA NIGRICORNIS 

 2 Labrum. 3 Labium. 4 Leg 



5 Ej-es. 6 Maxilla. 



GALERUCELLA NYMPHAEAE 

 9 Labrum. 10 Leg. 11 Labium. 12 Maxilla 



DONACIA PALMATA 



13 Larva just emerged from the egg. 14 Dorsal apodeme. 15 Longi- 

 tudinal section of a trachea. 16 Surface section of trachea showing 

 taenidia. 17 Lateral view of apex of abdomen of mature larva. 18 Por- 

 tion of a stem of Nymphaea advena with a mature larva feed- 

 ing with its head and thorax buried in the tissues of the plant. 19 Dorsal 

 iispect of the four apical abdominal segments of a mature larva 



PLATE 2S 



Donacia palmata 

 Anatomic details of the caudal abdominal spiracle. Enlarged 



1 Portion of a stem of Nymphaea advena with a mature larva 



attached to it by its caudal spines, in the act of respiring 



2 Lateral view of a caudal spine and its internal attachment 



3 Apex of a caudal spine still more enlarged 



4 A transection of a caudal spine at the level d-e of figure 2 



5 A transection of a caudal spine at the level f-g of figure 2 



