Smithsonian miscellaneous collections . ive host. The following account of the planidium of a species of Perilampusparasitic on larvae of Chrysopa is given by H. S. Smith (1917). Theeggs are laid on the leaves of plants where the Chrysopa larvae arelooking for aphids. From the egg hatches an active planidium ( A), which at first crawls rapidly about, but soon attaches itself tothe leaf by its caudal sucker and stands up at a right angle to the leafsurface. In this position it may remain motionless for days at a timeuntil some insect comes within its reach. Then suddenly the planidiumbeco
Smithsonian miscellaneous collections . ive host. The following account of the planidium of a species of Perilampusparasitic on larvae of Chrysopa is given by H. S. Smith (1917). Theeggs are laid on the leaves of plants where the Chrysopa larvae arelooking for aphids. From the egg hatches an active planidium ( A), which at first crawls rapidly about, but soon attaches itself tothe leaf by its caudal sucker and stands up at a right angle to the leafsurface. In this position it may remain motionless for days at a timeuntil some insect comes within its reach. Then suddenly the planidiumbecomes frantically active, reaching and swaying back and forth inits attempt to attach itself to the prospective host. If a Chrysopalarva comes too near, the planidium attaches itself with lightning-like quickness to a hair or bristle of the host. It then leisurely crawlsdown the hair to the hosts body and attaches itself by its mouthhooks. When the Chrysopa larva spins its cocoon and pupates, the no. 9 INSECT METAMORPHOSIS—SNODGRASS 73. , -r-n ff-r-m
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
