AQUATIC IXSECTS IN NEW YORK STATE 491 



PLATE 24 



'Sections of the stem of Sagittaria 



1 Cross section. 2 I>ongitu(linal section, both showing intercellular 



spaces and an"angement of tissues 

 3, 4 Eggs of D o n a c i a ii o r o s i c o 1 1 i s 



PLATE 35 



Donacia 



Anatomic details of the larvae. Enlarged 



DONACIA CINCTICORNIS 

 1 Mandibles. 2 Antennae. 3 Leg. 4 Maxilla^ 5 Labium. G Labrum 



DONACIA PALMATA 

 r Maxilla. 8 Antenna. 9 Labrum. 10 Eyes. 11 INIandililes. 12 Leg 



DONACIA SUBTILIS 

 13 Eye. 14 Leg. 15 Mandibles. IG Maxilla. 17 Labrum. 18 Labium. 

 T.» Antenna 



PLATE 26 



Donacia 



Anatomic details of the larvae. Enlarged 



DONACIA rOROSICOLLIS 

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

 'T Antenna 



DONACIA AEQUALIS 

 8 Mandibles. 9 Maxilla. 10 Antenna. 11 Labrum. 12 Leg 



DONACIA EMARGINATA 

 13 Labrum. 14 Antenna. 15 Labium. 16 Maxilla. 17 Leg. 18 Man- 

 •dibles 



PLATE 27 



Haemonia, Galerucella and Donacia palmata 

 Anatomic details of the larvae 



HAEMONIA NIGRICORNIS 

 1 Mandibles. 2 Labrum. 3 Labium. 4 Leg. 5 Eyes. G Maxilla. 

 '7 Antenna 



GALERUCBLLA NYMTHAEAE 



8 Mandibles. 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 

 taenldia. 17 Lateral view of apex of abdomen of mature larva. 18 Poi'- 

 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 2S 



Donacia palmata 

 Anatomic details of the caudal abdominal spiracle. Enlarged 



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



3 Apex of a caudal spine still more enlarged 



4 A transection of a caudal spine at the level cl-e of iigure 2 



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



