The group to which our insect belongs, like the others of 
Mons. Latreille’s divisions of his genus Lehia , has been con- 
stituted into a genus named Demetrias by Professor Bo- 
nelli: it may be at once distinguished from Dromius of the 
same author, to which it is closely allied, by the bilobed pe- 
nultimate joints of the tarsi ; and from Lebia it differs essen- 
tially in many respects, as may be seen by comparing the 
present dissections with those of plate 87? where that genus 
is illustrated. 
Demetrias appears to be exclusively confined to Europe; 
and at present contains but 4 species, all of which have been 
confounded under the name of Carabus atricapillus : 2 only 
of these have at present been recognized as British, viz. Z). atri- 
capillus and Z). monostigma : the former pretty insect may be 
found almost all the year round, under the bark of trees ; the 
latter, which we have figured under the name that it received 
from Dr. Leach, and which accompanies the description of it 
in Samouelle’s Entomologist' s Compendium , published several 
years before Germar’s work appeared, was first detected at 
Swansea, and was formerly considered a rare insect in this 
country, but has lately been taken in abundance on the coast 
of Norfolk by the Rev. T. Skrimshire, and at Whittlesea 
Meer the end of July by Mr. Bentley and Mr. Chant. It in- 
habits the roots of grass, and conceals itself on the sea- coast 
under rejectamenta . 
The plant is Salicomia herbacea (Marsh Samphire). 
