. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 36 Bl I'.H, U. s. DEPARTMENT OF AGRICULTURE. but slightly rounded, bearing IS or 20 Lobes, as illustrated in figure u, a. Pos- terior stigmal plates very evident, nol appreciably elevated or depressed, ap- proximate, each with three well-chitinized slits pointing toward those of the opposite plate as illustrated In figure 9. Slits proportionately Longer and narrower, than In either of the other Lnstars. The tine bristles about margin Of Stigmal plate arranged in four sets, relatively finer and shorter than in t
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 36 Bl I'.H, U. s. DEPARTMENT OF AGRICULTURE. but slightly rounded, bearing IS or 20 Lobes, as illustrated in figure u, a. Pos- terior stigmal plates very evident, nol appreciably elevated or depressed, ap- proximate, each with three well-chitinized slits pointing toward those of the opposite plate as illustrated In figure 9. Slits proportionately Longer and narrower, than In either of the other Lnstars. The tine bristles about margin Of Stigmal plate arranged in four sets, relatively finer and shorter than in the second instar. Anal opening on venter of last segment, with a rounded protuberance on either lateral side, the entire area including these protu- berances elevated to form a distinct tubercle armed about its base by a concentric area of minute spinules. Body of larva glabrous, except for areas of microscopic spinules arranged as follows: Band on Newport's segment cov- ering the anterior two-thirds of the dorsum but widening ventrally to cover the venter; narrower bands extending about the anterior margin both dorsally and ventrally of the second, third, and fourth segments; fusiform bands composed of broken rows upon the venter only of segments 5 to 12. There are no lateral spinulose areas on segments 5 to Fig. 8.—Tin; melon fly : Third instar larva, a, Lateral view of entire body ; b, dorsal view of anterior end; c, d, lateral and ventral views of same. Enlarged. (Original.) ni'KATTOX OF LARVAL INSTAES. The larva of the melon fly passes through three instars before be- coming full grown. The number of hours passed in each instar has been obtained for the first 12 larvie recorded in Table VI. These larvae were transferred daily to fresh pieces of ripe papaya pulp, and were therefore given the best combination of food and tempera- ture for rapid development known to the writers. The majority of these 12 larva? passed about 1 day in each of the first two instars and abo
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