I believe no difference exists in the antennae to distinguish 
the sexes of Trichius, but the abdomens vary in their shape 
at the apex ; and the tibiae of the intermediate pair of legs is 
remarkably curved at the base in the males of some species, a 
character pointed out to me by Mr. J. H. Griesbach. 
I observed in dissecting the mouth that the labrum is formed 
of two plates, the upper one being attached and applied close 
to the clypeus ; the other is united by a long muscle to the 
head : in the Geodephaga, the latter appears to be wanting, 
or else it forms the lining to the labrum. 
The larvae of the Trechi live in putrescent wood, where the 
perfect insects are also found, as well as upon the trunks of 
trees, and frequently upon flowers. 
The following species have been recorded as British. 
1. T. hemipterus Linn . — Oliv. v.\.n° 6. pi. 9 .f. 83. — Schcef. 
Icon . tab. ^Q.f. 10 8$ 11. 
The late Mr. Francillon assured me that the pair con- 
tained in his Cabinet were found alive in England ; 
I think he said in a chalk-pit in Kent. It occurs on 
the Continent at the roots of rotten willows, in sandy 
places. 
2. T. fasciatus Linn. — Don. Brit. Ins. 4. 140. 
This rare and handsome insect is said to be attached 
to the flowers of the Syringa, Filipendula, and um- 
belliferous plants. Most of our specimens I be- 
lieve came from Wales, where it has been found by 
Mr, Dillwyn. I had the pleasure of being present 
when Mr. Dale found one upon the flowers of thyme 
near Loch Rannoch, the 14th July. 
3. T. variabilis Linn. — Curtis Brit. Ent. pi. 286. 
The only figure in any English work of this insect, is 
in “ The Entomological Transactions,” from a female 
taken upon the trunk of an oak in 1 806 at Penge 
Common near London. It is now found annually 
by the Messrs. Griesbach in the decayed parts of 
oak trees in Windsor Forest; and these gentlemen 
have also bred it from the larva. 
4. T. nobilis Linn. — Don. 5. 154 .Jig. 1,2 # 3. — Sam.pl. \ .f. 2. 
This local insect is found in May and June in the 
flowers of the dog-rose, elder, &c. 
The plant is Bhamnus Frangula (Alder Buckthorn). 
