. The Canadian entomologist. Insects; Entomology. Fig. 2. Old feeding punctures on under side of leaf showing ". J corky tissues developed around punctured area. Fig. 3. Adult of Z. sculellaris, x 7. When the burrows of two larvse of approximately equal size join up, these two larvse may both live if they remain in different areas of the single blister thus formed, but in nearly every caseonly one survives A large blister covering almost an entire leaf frequently contains one healthy larva only, together with six or seven smaller dead specimens which show no apparent cause for death. The
. The Canadian entomologist. Insects; Entomology. Fig. 2. Old feeding punctures on under side of leaf showing ". J corky tissues developed around punctured area. Fig. 3. Adult of Z. sculellaris, x 7. When the burrows of two larvse of approximately equal size join up, these two larvse may both live if they remain in different areas of the single blister thus formed, but in nearly every caseonly one survives A large blister covering almost an entire leaf frequently contains one healthy larva only, together with six or seven smaller dead specimens which show no apparent cause for death. The larvae are found with the ventral side uppermost. They are legless, and can move as readily on the dorsum as on the venter. While in the blister they are very active and can move rapidly, but when removed from it their progress is very slow In figure 4 we illustrate a larva of this species in the penultimate stage. The characteristic black markings on the meso- and meta-thoracic and on the abdominal segments are present in all stages of this larva, with the exception of the first and the final stages. They occur both on the dorsum and venter. By the middle of September the majority of larvae are mature, measuring 6 mm long. They now break through the thin upper epidermis of the leaf (Fig 1 C) and fall to the ground. In captivity the escaped larva burrows into the soil to the depth of about 4. 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 Canada (1863-1871); Entomological Society of Canada (1951- ); Entomological Society of Ontario. Ottawa [etc. ] Entomological Society of Canada [etc. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubje, booksubjectentomology
