. Annual report. Entomological Society of Ontario; Insect pests; Insects. 96 ENTOMOLOGICAL SOCIETY. there are 15 or 20 different species of trees, it was noticed last spring that every tree of the wild cherry had two or three nests of these caterpillars, while not another tree in the plantation was affected. Another difference between these two insects appears in the construction of their cocoons. Those of Clisiocampa Americana are formed of a double web, the outer one loosely woven and filled with a powderly substance resembling sulphur. They are usually hid in some out cf the way place, as u
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 96 ENTOMOLOGICAL SOCIETY. there are 15 or 20 different species of trees, it was noticed last spring that every tree of the wild cherry had two or three nests of these caterpillars, while not another tree in the plantation was affected. Another difference between these two insects appears in the construction of their cocoons. Those of Clisiocampa Americana are formed of a double web, the outer one loosely woven and filled with a powderly substance resembling sulphur. They are usually hid in some out cf the way place, as under rails, boards or rubbish. Those of Clisiocampa disstria have none of this powdery substance and are more frequently formed inside of the leaves hanging on the trees. On St. Joseph's Island last summer, I saw hundreds of maple3 and other forest trees upon which every leaf contained one of these concoons, even the native spruces were so full of them that they appeared as if packed in wool. 4 Canker-Worms.—(Paleacrita verndta and Alsophila pometdria.)—Canker-worms have been very abundant in many parts of the country for a number of years past. There are also two species of these, but they resemble each other so closely that to the causal observer they differ only in name. One is known as the Spring Canker-Worm {Paleacrita verndta) (Fig. 63), and the other as the Fall Canker-Worm (Alsophila pometdria) (Fig. 64). One of the most noticeable differences in the two species appears in the egg stage. The eggs (Fig. 63 a and b) of the Spring Canker-Worm are oval in form and are laid in the spring in irregular patches hidden under loose bark or in expanding Fig. 63. Those of the Fall species are shaped like miniature flower pots, are ranged in regular rows in masses (Fig. 65, a, b, c), and deposited in the late autumn in some prominent place on the tree. The larvae of both species (Fig. 63 c and 65/) make their appear- ance with the opening of the leaves in the spring. They
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