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The Nematinae section is reputed to be unreliable, as well as out of date.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 checklist 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.