Larvae eruciform, with rarely more than five pairs of abdominal prolegs.
Larva eruciform, with seven or eight pairs of abdominal prolegs, or entirely legless.
Larvae caterpillars with thoracic legs and abdominal prolegs.
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.
The larvae or caterpillars have three pairs of thoracic (true) legs and several pairs of fleshy, abdominal prolegs.