Some insects injurious to forests . Fig. 16.—The pine sawyer. Larva, slightly enlarged: a, Forepartof head; b, secondabdominal segment; c, abdominal spiracle, a, b, Greatly enlarged. (Original.) metathorax a double transverse row of granules occurs, both on thedorsal and on the ventral surface, but there is no spiracle upon this segment. On the first 7 abdominal segments there are 1 rows o( granules on the dorsal surface (fig. 1(>, />), and 2 on the ventral. The 48 SOME INSECTS INJURIOUS TO FORESTS. last 2 segments are free from granules. On the anterior half of theside of each abdominal
Some insects injurious to forests . Fig. 16.—The pine sawyer. Larva, slightly enlarged: a, Forepartof head; b, secondabdominal segment; c, abdominal spiracle, a, b, Greatly enlarged. (Original.) metathorax a double transverse row of granules occurs, both on thedorsal and on the ventral surface, but there is no spiracle upon this segment. On the first 7 abdominal segments there are 1 rows o( granules on the dorsal surface (fig. 1(>, />), and 2 on the ventral. The 48 SOME INSECTS INJURIOUS TO FORESTS. last 2 segments are free from granules. On the anterior half of theside of each abdominal segment except the last, a spiracle (fig. 16, c)similar to that on the mesothorax, except that it is much smaller, isto be found. In mature larvae each abdominal segment bears a longi-tudinal fold on each side, known as the pleural fold. On immaturelarvae the pleural folds on the first 2 abdominal segments are soobscure as to be scarcely noticeable. The anal fold is quite hairy andbears the anal opening. Numerous hairs occur upo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1910
