AQUATIC IXSECTS IN NEW YORK STATE 



491 



PLATE 24 



■Sections of the stem of Sagittaria 



1 Cl'oss section. 2 Longitudinal section, both showing intercellular 



spaces and arrangement of tissues 

 3, 4 Eggs ofDonaciaporosicollis ^ 



PLATE 25 



Donacia 



Anatomic details of the larvae. 



Enlarged 



DONACIA OINCTICORNIS 



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



7 Maxilla. 8 Antenna. 



DONACIA PALMATA 

 9 Labrum. 10 Eyes. 



DONAOIA SUBTILIS 

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

 19 Antenna 



PLATE 26 



Donacia 

 Anatomic details of the larvae. Enlarged 



5 Labium. 6 Labrum 

 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. 



5 Leg. 6 Eyes. 



DONACIA EMARGINATA 

 13 Labrum. 14 Antenna. 15 Labium. 16 Maxilla, 

 dibles 



PLATE 27 



12 Leg 

 17 Leg. 



18 Man- 



Haemonia, Galerucella and Donacia palmata 

 Anatomic details of the larvae 



1 Mandibles. 

 Antenna 



8 Mandibles. 



HAEMONIA NIGRICORNIS 

 2 Labrum. 3 Labium. 4 Leg. 5 Eyes. 6 Maxilla. 



GALERUCELLA NYMPHAEAE • 



9 Labrum. 10 Leg. 11 Labium. 12 Maxilla 



DONACIA PALMATA 

 13 Larva just emerged fro^m the egg. 14 Dor»aI apodeme. 15 Longi- 

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

 taenldla. 17 Latei'al view of apex of abdomen of mature larva. 18 Por- 

 tion of a stem of N y m p h a e a a d v e n a with a mature larva feed- 

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

 aspect of the four apical abdominal segments of a mature larva 



PLATE 28 



Donacia palmata 



Anatomic details of the caudal abdominal spiracle. Enlargn^d 



1 Portion of a stem of N y m p h a e a a d v e n a with a unature 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 



