Benson, R.B., 1958
Hymenoptera: 2. Symphyta. Section (c)
Dichotomous key to sawflies of the subfamily Nematinae which contains most of the small black species. Supplements contain corrections to parts a and b. This section contains the index to all three parts.
Can be downloaded from the Royal Entomological Society's website.
||The Royal Entomological Society of London (RES)
||Vol VI, Part 2(c)
|Comments and Corrigenda
||The Nematinae section is reputed to be unreliable, as well as out of date.
There's a list of additional species added since Benson's keys in Adam Wright's AIDGAP key (p536-7)
Several new species have been added to both Pachynematus and Pristiphora.
The following from John Grearson relates to Benson's keys for Cladius, Priophorus and Trichiocampus:
In the latest British list the genera Priophorus and Trichiocampus are synonymised under Cladius.
Benson's 1958 key included a mistake involving the two species feeding on Ulmus. He published a short paper in EMM in 1961 correcting this mistake. The species he called ulmi in 1958 is really rufipes and the species he called laevifrons in 1958 is really ulmi.
Referring to Benson's 1958 key, the species now treated as Cladius are as follows:-
P141 - Cladius pectinicornis now embraces difformis as a synonym.
P142 - Priophorus brullei becomes Cladius brullei.
P143 - Priophorus pallipes becomes Cladius compressicornis.
Priophorus pilicornis becomes Cladius pilicornis.
Priophorus ulmi is now Cladius rufipes (as above).
Priophorus laevifrons is now Cladius ulmi (as above).
Trichiocampus viminalis is now Cladius grandis.
If these names are overwritten on your copies of Benson's key the key can still be used.
There are many other changes in the new British list but some of the above species are very common and hopefully these notes will clarify the newly adopted names.
||Covers all UK species known at the time.
||Line drawings in the text.
||Under a Stereo Microscope.
||Female specimens set with saw everted.
||Medium difficulty, often using genitalia or saw sheaths.