Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] THE BEETLES 163 insects, often checking their increase notice- ably. Recently a very similar species, the Asiatic ladybird, was imported from China to prey upon the San Jose scale, but has not be- come established in this country. Several very small, black species of the genus Micron'cisea, with their little black larvae, are also among the most effective enemies of scale insects. One of the most remarkable cases of the utilization of a beneficial insect was the intro- duction into California of the Aus
Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] THE BEETLES 163 insects, often checking their increase notice- ably. Recently a very similar species, the Asiatic ladybird, was imported from China to prey upon the San Jose scale, but has not be- come established in this country. Several very small, black species of the genus Micron'cisea, with their little black larvae, are also among the most effective enemies of scale insects. One of the most remarkable cases of the utilization of a beneficial insect was the intro- duction into California of the Australian lady- bird (I'cdalia ccintiiiiilis), which in a few years was able to almost entirely subdue the cottony cushion-scale, which was destroying the orange trees. Unfortunately, there are some sinners among the ladybirds, for there are one or two large, hemispherical, black-spotted, yellow spe- cies of the genus Epilachna, which defoliate FIG. 2^9. Pupge of the cucumbers, melons, and beans. twice-stabbed ladybird- beetle, in cast larval skins IV. BEETLES WITH DIF- FERENT-JOINTED TARSI (HETEROMER. 1) The section Hctcrom- era is distinguished by having the front and mid- dle feet with five tarsal segments, while the hind feet have but four; hence the name ' different- jointed.' A number of small, obscure families are included in this sec- tion, only two being of sufficient importance to warrant consideration.
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