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SAY, THOMAS, 1859. American Entomology, Vol. I, 1859, p. 368. 



SEVERIN and SEVERIN, 1910. Notonecta undulata Say preying upon 

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EXPLANATION OF PLATES. 

 PLATE XIX. 



Fig. i. Ventral view of terminal abdominal segments of male Noto- 

 necta undulata Say. 



Fig. 2. Fifth in star nymph. 



Fig. 3. Ventral view of terminal abdominal segments of female. 



Figs. 4a to 4e. Diagrams of dorsal view of meso- and metathorax 

 of nymphs, first to fifth instars respectively, showing the de- 

 veloping wing pads. 



Fig. 5. 3rd instar nymph. Both rows of swimming hairs shown. 



Fig. 6. Antennae of 5th instar nymph. 



Fig. 7. Antennae of adult male. 



Fig. 8. 2nd instar feeding upon an ostracod. 



Fig. 9. 1st instar nymph drawn by Miss Ellen Edmonson. 



Fig. 10. Tarsus of hind leg of first instar nymph showing the tarsal 

 claws which become less conspicuous as development ad- 

 vances. 



Fig. 11. Egg of Notonecta undulata, showing details of structure, 

 drawn by Miss Ellen Edmonson. 



