. Circular. Insects. Fig. 4.—A ladybird (Hippodamia convergens) which preys on the Colorado potato beetle. En- larged (author's illustration). It has already been stated that atmospheric conditions, with the exception of extreme heat in its more southerly range, are not espe- cially important factors in the repression of this species; hence its fluctuation in num- bers, which is noticeable at least locally every season, must be accounted for by the activity of its insect enemies, the numbers of which are legion. Several groups of these enemies are known, each of which contains, as a rule, many
. Circular. Insects. Fig. 4.—A ladybird (Hippodamia convergens) which preys on the Colorado potato beetle. En- larged (author's illustration). It has already been stated that atmospheric conditions, with the exception of extreme heat in its more southerly range, are not espe- cially important factors in the repression of this species; hence its fluctuation in num- bers, which is noticeable at least locally every season, must be accounted for by the activity of its insect enemies, the numbers of which are legion. Several groups of these enemies are known, each of which contains, as a rule, many species. Among the most important are ladybirds,* many common species of which, in both their larval and adult stages, prey upon the potato beetle, destroying great numbers of its eggs and young larvae. One of the commonest of these ladybirds is illustrated for compari- son with the Colorado beetle by figure 4. Several ground-beetles,& also of predaceous habits, attack and devour the larva? of this potato beetle, and of these the so-called great Lebia (Lebia grandiA Hentz, fig. 5) is particularly attached to this species, following it wherever it goes and doing perhaps more effective service than any single natural enemy of which we have knowledge. Sev- eral soldier-bugs also attack it, one of which, the spined soldier- ed The ladybird enemies of this species are: Coccinella 9-notata Hbst., C. sani guinea L., Megilla maculata DeG., Hippodamia convergens Guer., H. 13-punc4 tata L., H. glacialis Fab., Anatis 15-punctata Ol. (ocellata), and Chilocortii bivulnerus Muls. 6 Carabid enemies include the great Lebia (Lebia grandis Hentz), the fiery ground beetle {Calosoma calidum Fab.), Pasimachus clongatus Lee, Harpalvi caliginosus Fab., Lebia atriventris Say, and Brachynus kansanus Lec. [Cir. 87]. Fig. 5.—Lebia grandis, an impor tant potato-beetle enemy. En larged (Marx, del.).. Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
