. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fui. 37.— The saws of ;i sa\vti\\ Enlarizod and nat- ural size. Orijriiial- Adults ill this order are eharaeterized by the ]) of two pairs of wiuss. both pairs inenibrauous, the front pair larger than the hind pair. The nioulli parts are eom- plex, and are adapted for biting and for suelving. However, the strtieture of the mouth parts is not usually of direct eco- nomic importance, since the adults do not habitually feed on or destroy that which is of value to man. In one subgroup of the Hynieuopter
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fui. 37.— The saws of ;i sa\vti\\ Enlarizod and nat- ural size. Orijriiial- Adults ill this order are eharaeterized by the ]) of two pairs of wiuss. both pairs inenibrauous, the front pair larger than the hind pair. The nioulli parts are eom- plex, and are adapted for biting and for suelving. However, the strtieture of the mouth parts is not usually of direct eco- nomic importance, since the adults do not habitually feed on or destroy that which is of value to man. In one subgroup of the Hynieuoptera the abdomen of the adidt is broad at the pouU where it joins the thorax ; in other words, the insects are " broad ; This section includes the Tenthredinida^ or family containing many injurious species. The name sawtly is given to this family because the end of the abdomen in the adult female is provided with genuine saws, which it uses in making a place for the deposition of its eggs. Sawtly larva^ strongly resemble the larva^ of the Lepi- doptera, but may be distinguished from them by the number of pro- legs— the false legs situated behind the three pairs of genuine legs near the front end of the body. The lar\-aMif sawtlics usually have six to eight pairs of these )iro- legs, while those of the butterflies or moths have never more than five pairs. Examples of injurious sawflies are seen in the pear slug and the cm-rant woi'm. A closely related subgroup of the Hymcnoptera comprises a mmiber of families in which the female is provided with a boring apparatus at the hind end of the abdomen. These families include some of our important beneficial species living as parasites in the bodies of other insects, the Ichneu-. Fio S8-— An ii'Iuioumon. Pitiipla. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
