PLATE XV. 



GERRIS AND TREPOBATES. 



Fig. 1. Hatched egg of Gerns marginatus, showing the postnatal 

 molt and the black chitinous "egg burster." 



Fig. 2. First instar nymph of G. marginatus. 



Fig. 3. Nymphal molt of Gerris. 



Fig. 4. Front foot of Gerris 



Fig. 5. First instar nymph of G. remigis. 



Fig. 6. Ventral view of male Gerris. 



Fig. 7. Dorsal view of male Gerris. 



Fig 8. Ventral view of female Gerris. 



Fig. 9. Dorsal view of female Gerris. 



Fig. 10. Mating Gerris. 



Fig. 11. Eggs of Trepobates pictus on under surface of floating duck- 

 weed. (Lemna.) 



Fig. 12. First instar nymph Trepobates pictus. 



Fig 13. Egg ready to hatch. Note the "egg burster" between the 

 eyes. The small spots are red as well as the eyes. 



Fig. 14. Eggs of Trepobates pictus on underside of leaf blade. Note 

 the gelatinous matrix. If disturbed the entire mass comes from the leaf 

 intact. 



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