PLATE XxX. 
Fic. 1. Ventral view of terminal abdominal segments of male No- 
tonecta undulata Say. 
Fig. 2. Fifth instar nymph. 
Fic. 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 developing wing- 
pads. 
FIG. 
Fic. 
FIG. 
FIG. 
Fic. 
Fic. 
claws, 
FIG. 
pire Ts: 
ee) 
9; 
Third instar nymph. Both rows of swimming hairs shown. 
Antenne of fifth instar nymph. 
Antenne of adult male. ; 
Second instar feeding upon an ostracod. 
First instar nymph, drawn by Miss Ellen Edmonson. 
10. Tarsus of hind leg of first instar nymph, showing the tarsal 
which become less conspicuous as development advances. 
ite 
Egg of Notonecta undulata, showing details of structure, 
drawn by Miss Ellen Edmonson. Plate first used in Ento. News, XXVIII. 
(306) 
ee we 
Te SD ES ee ars ee NE eee me OD sy 
