. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TlIK PARASITES OF POPILUA JAPONICA IT) and the sky Bomewhat overcast. Under these conditions the beetles remain upon the foliage throughout the day, in contrast mtn their disappearance about noon on days when the temperature is high and the sunlight intense. This gives the fly a sweater opportunity U> oviposit and its own inclination to continue this throughout the da\ ,-athrr than to remain quiescenl on the foliage results in a mucU increased deposition of eggs. ;+ uâj0 *A rta The manner of oviposition is very unus
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. TlIK PARASITES OF POPILUA JAPONICA IT) and the sky Bomewhat overcast. Under these conditions the beetles remain upon the foliage throughout the day, in contrast mtn their disappearance about noon on days when the temperature is high and the sunlight intense. This gives the fly a sweater opportunity U> oviposit and its own inclination to continue this throughout the da\ ,-athrr than to remain quiescenl on the foliage results in a mucU increased deposition of eggs. ;+ uâj0 *A rta The manner of oviposition is very unusual in that it leads to tn< placement of the egg on a restricted portion of the host body, tn case the beetles attacked are feeding singly upon the foliage they take alarm immediately a fly alights in the vicin- ity, and a closer ap- proach leads them to drop to the ground. For this reason oviposition normally takes place upon mating pairs, since these do not take alarm so readily. The female fly may stand about on the leaf for some time, apparently watching the beetles, after which she makes a dash for the pair, running diagonally across the thorax of the female and pausing only for an instant to place an egg thereon. About 98 per cent of all eggs laid are so placed and. under normal conditions such as prevail at Koiwai. about 85 to 96 per cent are upon female beetles. This has a very impor- tant bearing upon the effectiveness of the par- asite. Oviposition occurs at times on other parts of. Fig. 13âReproductive organs of female Gntittr cintrra Sbeetiebody. bc^naUyaflywiU approach the host from the rear in^ which case the eggisplaced upon the elytra, orfromthe side,when i maybelaM ononeoftL legs. The greater proportion ol misp ace, ?zl however, are ventrally on the thorax, these baling been so placed bvfvbositionl^oughaholemtheleaf. Instances have been observed of SZ^melaligh^ directly upon the beetles from ^V^f⢠therms no uniformity in the position of the egg. I >
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