522 
FAUNA AND FLORA OF NORFOLK : COLEOPTERA. 
Trechus discus, Fab. Harleston District (Fox). 
,, micros, Hbst. One example at the foot of the cliff, 
Happisburgh, September, 1894 (Wood). 
Bembidium assimile, Gyll. Hunstanton (Thornley). 
Bembidium normannum, Dej. Horning (Bedvvell). This is usually 
a maritime species. 
,, varium, 01. Brancaster (Thornley). 
Tachypus pallipes, Duft. Gimingham, running in damp places 
on the cliffs (Butler). 
Haliplidje. 
Hai.iplus fulvus, Fab. Hunstanton (Thornley). 
,, flavicollis, Sturm. Brancaster (Thornley). 
DytisciDjE. 
Bidessus unistriatus, Schr. Freely near Horsey Mere (Champion). 
Deronectes assimilis, Payk. Gimingham (Butler ) ; Brancaster 
(Thornley). 
Agabus paludosus, Fab. Not uncommon at Lakenham, September, 
1898 (Edwards). 
„ uliginosus, Lin. Brandon (Thouless). 
,, affinis, Payk. This species must be expunged from 
our list ; my Brandon specimens proving to be 
unguicularis, Thoms. The unsatisfactory nature 
of the characters given for the separation of 
these two species in the English text-books 
led Mr. Thouless to make a critical examination 
of authentic specimens of the males of each, and 
it is clear from the material prepared by him that 
the striae in the series forming the stridulatory 
organ on each side of the third ventral segment 
of the abdomen are about twice as numerous in 
affinis as in unguicularis; the ocdeagus of the 
former, too, has in the lateral aspect a distinct 
angular projection near the middle of its upper edge, 
which is entirely wanting in that of the latter.] 
., didymus, 01. Harleston District, rare (Fox) ; Holkham, 
Lakenham (Edwards) ; Gimingham (Butler). 
