The most important Hymenopterous pests are the sawflies or Tenthredinidae, which in their larval stage attack almost all vegetation.
A large and dominant Holoarctic fauna, with numerous subdivisions, ranges over the great northern continents, and is characterized by the abundance of certain families like the Carahidae and Staphylinidae among the Coleoptera and the Tenthredinidae among the Hymenoptera.
Tenthredinidae (Hylotoma) - 2.
The Tenthredinidae, or true saw-flies, are distinguished by two spines on each fore-shin, while the larvae are usually caterpillars, with three pairs of thoracic legs, and from six to eight pairs of abdominal prolegs, the latter not possessing the hooks found on the pro-legs of lepidopterous caterpillars.
Hordei, the " joint-worm " of the United States, which produces galls on the stalks of wheat;4 also various members of the family Tenthredinidae, or saw-flies.