The genus Dianous was first recorded by Mr. Samouelle in 
his Useful Compendium ; and upon comparing its characters 
with those of Stems , the following differences will be very 
evident. The antennae and 3rd joint of the palpi are less 
clavate, the lip (or tongue, as it is sometimes called) is not 
elongated, nor of the same form as in Stenns : the setae of the 
abdomen are very much longer, the eyes are smaller and more 
distant, and the mandibles are not serrated on the internal 
edge as in the genus last named. 
Whether our insect is the Staphylinus biguttatus of Lin- 
naeus is very doubtful from his vague description, which will 
apply to several species; it is, however, undoubtedly the 
Stems ccerulescens of Gyllenhal, which having been published 
many years, his specific name has been restored. In the 
native land of that acute and learned Naturalist, this little in- 
sect is every where to be found frequenting the shady banks 
of rivulets. In this country it is very local, and was first dis- 
covered by Dr. Leach, who met with it (Mr. Stephens in- 
forms me) at Spitchwick and Woodland near Plymouth, 
and upon the banks of the river near Roslyn Castle, Scot- 
land. 
Littorella lacustris (Plaintain Shore- weed), a male plant of 
which is figured, covers the shores of many of the lakes in 
Scotland. We gathered it near Tarbet on the banks of 
Lochlomond, and at Loch Katrine. 
