DRAGONFLIES AND DAMSELFLIES IN PONDFISH CULTURE. 197 
Wes. 19 and 20.—Dorsal and ventral tooth from gizzard of Anaz junius nymph. Fics. 21 and 22.—Dorsal and ventral tooth 
from gizzard of Libellula luctuosa nymph. Fics. 23 and 24.—Dorsal and ventral tooth from gizzard of Epicordulia princeps 
nymph. Posterior end of each tooth toward the right. Fics. 25 to 28.—Enallagma nymph: 2s, mask; 26, mandible; 27, 
maxilla; 28, gizzard teeth, the upper edge of figure anterior. 
