** Under surface enth'ely or in greater part black ; inflexed margin 
of elytra light rufo-testaceous — G. natator, hicolor, distinctus, 
easpius, and colymhus. 
*** Under surface entirely or in greater part black ; inflexed margin 
of elytra geneous — G. marinus and opacios. 
* — Under surface entirely testaceous. 
1. G. minutus, Fab. Oblong ovate, tolerably convex, above of a bluish- 
black colour, scarcely shining, the sides of the body and front of 
the head metallic, the elytra strongly and equally punctate striate, 
under-side and legs entirely rufo-testaceous. 
Long. 1%— 2i"'; lat. 1— li'". 
The smallest of our species, and one that is readily distinguished 
from all the others of the genus. The upper surface is densely and 
finely coriaceous, so that the insect is less shining than any other of 
the species, the head is bluish-black, more or less brassy in front, the 
sides of the thorax are brassy and rugose, and there are some evident 
rugosities at its base in front of the scutellum ; the scutellum has at 
its base a broad, well-marked carina. The elytra are brassy at the 
sides, strongly punctate striate, the external striae a little more marked 
than the inner ones, the striae are also rather more marked at the apex 
than at the base. The under-side, including the inflexed margin of the 
elytra, together with legs, is entirely testaceous ; sometimes the basal 
segments of the abdomen are a little infuscated. My specimens show 
but little variation. 
I have found this species abundantly in Invernesshire, and it occurs 
in various other parts of Scotland, though it is very local. I have never 
found it in England. 
2. G. urinator, 111. Ovate, convex, very shining, above of a somewhat 
purple-black, the front of the head, the sides of the elytra, and 
some lines along the strise of the latter, coppery ; the elytra are 
finely punctate-striate, the striae being entirely obliterated, except 
at the sides and apex ; under-side and legs entirely rufo-testaceous. 
Long. 3— 3^"' ; lat. If —If. 
This is also a very distinct species, and is easily distinguished from 
all our other species (except G. minutus) by the colour of the under-side ; 
its very shining appearance and the fine punctuation of the elytra 
prevent its being confounded with minutus. 
The front part of the head is brassy and dull, the vertex black and 
shining ; the thorax black and shining, coppery towards the side, with 
