. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 40.—The four stages in the butterfly's life-history are represented, eggs, larvae or caterpillars, chrysalis and imago. The common Cabbage-butterfly is not a native of this Continent, but has been imported from Europe within recent years. It reached Quebec about 1860; -v, in 1863 it was quite common about Que- bec; in 1867 FlG- 41- i t w a s i n Montreal; in 1868 it spread from New York where it had been introduced from Europe; by 1881 it had spread throughout the eastern half of Continent; by 1886 the Rocky Mountai
. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 40.—The four stages in the butterfly's life-history are represented, eggs, larvae or caterpillars, chrysalis and imago. The common Cabbage-butterfly is not a native of this Continent, but has been imported from Europe within recent years. It reached Quebec about 1860; -v, in 1863 it was quite common about Que- bec; in 1867 FlG- 41- i t w a s i n Montreal; in 1868 it spread from New York where it had been introduced from Europe; by 1881 it had spread throughout the eastern half of Continent; by 1886 the Rocky Mountains had Fig. 42. been reached; and now it roams from the Atlantic to the Pacific. It displaced the native species (Pieris protodice), Figs. 41, male, 42, female, driving it before it; bu after thirty-six years of occupation the same native form re-appears with renewed vigor, and gives signs of competing successfully with the intruder. Lesson I.—The Eggs. Leaves of cabbage, turnip, or rape with the eggs should be collected. On which side of the leaves are the eggs found? Of what advantage 1 What is the shape of the eggs? The color? "What kind of an insect lays these eggs? What kind of creatures hatch from these eggs? Do they resemble the mother insect? How long before the eggs hatch? (It is important that the pupils should have the eggs under observation. If possible the study should be made on the objects in the fields, under natural conditions, but leaves might be brought into the class room).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
