GEODEPHAGA. 
71 
B.flammulatum, found commonly in marshes, is one 
of the prettiest in marking, being greenish-bronze, 
with variegated yellow transverse zigzag bands ; and 
B. pallidipenne (Plate II., Fig. 6), which occurs in 
great numbers on the Lancashire coast, though not 
met with often elsewhere, is also worthy of observation ; 
having a metallic head and thorax, and straw-coloured 
wing-cases, with a transverse indented darker fascia, 
which varies in intensity of colour and extent in 
different specimens. The curious species, B. palu- 
dosum, and Tacliypus jlavipes and pallipes, present a 
considerable likeness to the Elaphri and Cicindelce, at 
the beginning of the section ; their large eyes, slender 
legs, elegant shape, and semi-aquatic habits, encourag- 
ing the notion of their relationship, which is, however, 
prevented by their structural differences, the needle- 
pointed apical joint of the palpi in Bembidium being 
sufficient for a diagnostic character. 
The Trechina have the last joint of the palpi, as a 
rule, long and tapering, but in one or two genera it 
is short, although always considerably longer than in 
the Bembidiina the tribe has usually been regarded 
as containing only three British genera of small 
species ; one, Trechus, not in any way remarkable ; the 
next, udlpys, being composed of two very minute flat, 
yellowish insects, found absolutely under the tide- 
mark at mouths of rivers, under stones, and in salt- 
marshes, in Scotland, Ireland, Devon, Isle of Wight, 
&c. ; and the third, Perileptus, represented by a single 
species, areolatus, another very small pitchy-black 
beetle, which is found rarely on sands at the mouths 
of rivers, in Wales, &c. 
Patrobus and Pogonus are, however, now regarded 
