Identifying these staphs has been a great deal easier since the publication of the RES Handbook by Derek Lott and Roy Anderson (June 2011: £49 + £5 p&p from here). A few errors have been picked up and reported since publication. If you spot any more, please let me know.
Philonthus, p. 191, Fig. 334. The figure labels have been transposed for varians and jurgans – the one on the left (pointed) is jurgans and the one on the right (rounded) is varians.
Heterothops, p. 214, Fig. 342. The figure labels have been transposed for niger and minutus – the aedeagus labelled niger is actually minutus, and the one labelled minutus is actually niger.
I was pleased that Derek managed to include Quedius lucidulus (my recent first for Britain) in the Handbook at the last minute.
Derek passed away on the weekend of 18/19 June 2011 having just seen his second RES Handbook published. I am immensely grateful that he worked so hard in his final years to pass on his knowledge to other coleopterists, all the while suffering from cancer. A truly admirable achievement. He will be greatly missed but his legacy will be appreciated by generations of coleopterists.
Thanks to Israel Silva and Martin Harvey for letting me know about the errors in the RES Handbook.