1868.] 



55 



** Under surface entirely or in greater part black ; inflexed margin 

 of elytra light rufo-testaceous — G. natator, hicolor, distinctus, 

 caspius, and colymhiis. 



*** Under surface entirely or in gi'eater part black ; inflexed margin 

 of elytra reneous — G. marinus and opacus. 



* — 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. U— 2i-'"; lat. 1— U'". 



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 Tnvernesshire, and it occurs 

 in various other parts of Scotland, though it is very local. I have never 

 found it in England. 



2. G. iirinator, 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 striae 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—31"' . lat. 1^—1%"- 

 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 



