206 Annals Entomological Society of America _[Vol. VII, 
EXPLANATION OF PLATES. 
PLATE XXVII. 
Fig. 1. Resinous lump which heals the wound produced by the ovipositor of the 
melon fly, in the tender stems near the growing ends of the pump- 
kin vines. = 
Fig. 2. Resinous lump somewhat enlarged. 
Fig. 3. Split stem of pumpkin vine near growing end, showing the eggs depos- 
ited by the melon fly. 
4. Eggs deposited on the outer surface of the corolla and its lobes. 
5. Longitudinal section of the ovary of a pumpkin, showing the eggs depos- 
ited within a receptacle. | 
6. Green pistillate bud with. the corolla cut open, showing the eggs depos- 
ited on the style and inner surface of the corolla. 
Fig. 7. Eggs deposited on the inner surface of the corolla. 
Fig. 8. Cross section of the ovary of a pumpkin, showing the eggs deposited 
within a receptacle. 
PLATE XXVIII. 
Fig. 9. Squash showing depressions caused by the oviposition of the melon fly 
during the early development of this cucurbit. The tissue surround 
ing the receptacle in which the eggs are deposited is probably 
killed by a secretion, and in the further development of the cucurbit 
a depression results. 
Fig. 10. Healed wounds due to a previous infestation of the melon fly. This 
trypetid is unable to puncture the hard rind of the larger pumpkins 
with its ovipositor, but often the resinous material covering the 
wound cracks and oviposition may then occur in the crevices. 
Fig. 11. Depressions and healed wound in a ripe pumpkin. 
Fig. 12. Pumpkin, abnormal in shape, as a result of being ‘‘stung’’ by the melon 
fly during its early development. 
Figs. 13 and 14. Remains of two pumpkins which were turned over to show the 
side resting on the ground. After the maggots bore out of a seri- 
ously reinfested pumpkin, only the rind and seeds remain. 
Fig. 15. The rind of a seriously reinfested pumpkin collapsing due to decay 
caused by the larve. 
Fig. 16. When the pumpkin is not seriously reinfested with the melon fly larve, 
the rind does not collapse. Such partly decayed cucurbits often 
serve as hosts for other insects which complete the work of de- 
struction. 
Fig. 17. Pumpkin cut in half showing the decayed pulp and seeds, and the larve 
which have jumped out of the decayed mass. 
PLATE X XIX. 
Fig. 18. Resinous material which exudes from the wound produced by the ovi- 
positor of the melon fly in the ovary of a pumpkin. 
Fig. 19. Resinous substance in the constriction between the flower and the ovary 
where the eggs are often deposited. 
Fig. 20. Discoloration on the corolla indicating the region where the fly has 
punctured the closed flower to deposit its eggs within the stigma 
or style. 
Fig. 21. Discoloration on the corolla where the pest has punctured the closed 
flower to deposit its eggs on the inner surface of the corolla lobes. 
Fig. 22. The corolla of one of the flowers has detached and dropped to the ground, 
leaving a black flower scar. The larve in this case devoured the 
stigmas and styles and descended into the ovary. 
Figs. 23 and 24. Longitudinal sections of two ovaries showing a spongy decayed 
pulp caused by the maggots. 
Fig. 25. Corolla detaching from the ovary after the larve have devoured the 
stigmas and styles and descended into the ovary. 
Fig. 
Fig. 
Fig. 
