gsB Sir Everard Homers farther observations 
Fig. 4. Last joint of toe, upper side, magnified 400 times. 
Fig. 5. Under side of toe, and extremity of the shank, mag- 
nified 400 times. 
Fig. 6 and 7. Upper and side views of two joints of the toe, 
magnified 400 times, to show the plantar suckers. 
Fig. 8 and 9. Calces, magnified 1600 times, to show the 
form of the sucker with which each is terminated. 
Plate XX. 
Fig. 1. The left front leg of the male dytiscus marginalis. 
Fig. 2. Ditto, underside. They are both magnified 25 times. 
Fig. 3. Tarsus of ditto. 
Fig. 4. Side view of ditto. 
Fig. 5. Under side of ditto. These three are magnified 
100 times. 
Fig. 6. Front view of the sucker (a) fig. 5, magnified 100 
times. 
Fig. 7. Side view of the sucker (6) fig. 5, magnified 100 
times. 
Fig. 8. Front view of the suckers (r) fig. 5, magnified 400 
times. 
Fig. 9. Several of the suckers (c) fig. 5, magnified 400 
times. 
" . . . ' i' ; 0 ; " - ” ? i 
Fig. 10. Second or middle left leg of dytiscus marginalis, 
magnified 25 times. 
Fig. 11. Tarsus of ditto, under side, magnified 100 times. 
Fig, 12. Several of the suckers (a) fig. 11, magnified 900 
times. 
Fig. 13, 14, and 15. Suckers (a) fig. 11. magnified 40,000 
times, to show the articulation between the peduncle and the 
