. Bulletin. Chart I. Concise exhibit of the enemies of egg:, larva, pupa,and adult of 57 It will be noticed that the length of the various stages of the hosthas a direct relation to the number of enemies in each stage. The eggand pupa each exist as such only about one month and. in addition, arewell protected in their earthen cells, hence we find but few natural ene-mies affecting them. On the other hand, the larva, which exists for amuch longer period, is beset with enemies, among the most important ofwhich are digger-wasps belonging to the genera Tiphia and Elis, whichare thoro
. Bulletin. Chart I. Concise exhibit of the enemies of egg:, larva, pupa,and adult of 57 It will be noticed that the length of the various stages of the hosthas a direct relation to the number of enemies in each stage. The eggand pupa each exist as such only about one month and. in addition, arewell protected in their earthen cells, hence we find but few natural ene-mies affecting them. On the other hand, the larva, which exists for amuch longer period, is beset with enemies, among the most important ofwhich are digger-wasps belonging to the genera Tiphia and Elis, whichare thoroughly adapted to burrowing through the soil in search of theirhost. These parasites have undoubtedly been responsible for the practi-cal eradication of grubs in ceratin areas—sometimes rather restricted,which can be accounted for by the fact that Tiphia at least, on accountof its large body and comparatively small wings, is unable to fly anygreat distance. Likewise, Tiphia, as well as all other white-grub para-sites, is somewhat checked in its increase by the length of its life cycleas compar
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