50 CATALOGUE OF THE INSECTS OF 



third joint thinner, and one-half longer than the second, the rest 

 of the joints short, G — -10 transverse, the last largest, rotundate, . 

 nearly obtuse; black, the two basal joints sometimes piceous. 

 Mandibles prominent, slender, slightly arcuate, rufous. Palpi 

 piceo-testaceous, third joint nigro-piceous. Head short, sub- 

 triangular, narrower than the thorax, finely and obsoletely scattered 

 punctate, the front down the middle rather elevated, longitudinally 

 but obsoletely depressed on each side at the base of the antennae. 

 Eyes very prominent. Thorax sub-semicircular, the front being 

 rather wider, almost one-half narrower than the elytra, a little 

 shorter than broad, the sides neatly roundod, sinuate narrowed 

 behind the middle, posterior angles obtuse, sub-prominent, base 

 and sides slightly margined ; convex above, opaque, rather thickly, 

 finely, and obsoletely punctate, very finely canaliculate. Elytra 

 almost double the length of the thorax, rather convex, somewhat 

 widest posteriorly, exterior angles ratherrounded, slightly shining, 

 thickly and finely punctate, clothed with a shining griseous down. 

 Abdomen deeper black, more shining, very finely and thickly 

 punctate. Legs piceo-testaceous, or testaceous, the femora some- 

 times fuscescent. 



On the banks of the Derwent, above Winlaton Mill. On those 

 of Wooler Water, below Langleyford, and near Wooler, and of the 

 Till.— 7. H, June. 



It burrows under the sand, raising little heaps like worm casts, 

 and comes abroad towards evening. Where I met with it, it was 

 prayed on by a colony of Formica rufa. It occurs on several of 

 the Berwickshire rivers, and has, I believe, likewise been taken 

 in Ireland, by Mr. Halliday. 



133. Platystethus, Mannerheim. 

 1. P. morsitans, Payk. 



Steph. Illust., Aland., v., 312. — Urichson, Gen. et Spec. 

 Staj^h., 782.^ — Oxytelus morsitans, Gyll. Ins. Suec, ii., 

 451. — Platystethus trilobus, Steph. Illust., Mand., v., 

 312. — PI. sulcatus, Marsh, lb., ^.c;.,313. — PI. brunnipennis, 

 lb.. I.e. — Platystethus pallidipennis, Ileer, Fn. Col. Helv., 

 i., 207. 

 Common. 



