4850 Insects. 



1. D. circuracinctus, Ahrens, Gyll., Steph., Sturm. ? elytris 

 sulcatis,D. dubius, Gyll., Aube. D. angustatus, Steph. Long. 30 — 33 ; 

 larg. 15 — 17. Whittlesea Mere ; near Cambridge. 



2. D. marginalis, Linn. D. submarginalis, Steph. 2 elytris 

 Icevibus, D. conformis, Kunz., Steph., Aube. Common every- 

 where. 



3. D. circumflexus, Fab. 2 elytris sulcatis, D. perplexus, Aube. 

 Near London ; Mr. Newman has taken it at Peckham. 



4. D. lapponicus, Gyll., Germ., Zetterst. D. septentrionalis, Gyll. 

 Long. 25 — 28 ; larg. 14 — 15. Pitchy brown, beneath testaceous, 

 margins of thorax and sides of elytra bordered with yellow, along the 

 elytra are 18 or 20 faint luteous lines: may readily be distinguished 

 by its smaller size, and the frequent luteous lines on elytra. I took 

 this insect in the Isle of Mull, September, 1854. 



5. D. punctulatus, Fab., Steph., &c. Common. 



6. D. dimidiatus, Bergst., Steph. Not so common as D. punctu- 

 latus, but generally distributed. 



Genus Cybister. 



1. C. Roeselii, Fab. Long. 30—33; larg. 16—18. Certainly rare 

 in England ; Stephens notices a specimen taken at end of September, 

 1826, at Walton, in Essex; also near Colchester, Steph. Man. 

 Dr. Power informs me that it has been taken at Southchurch. 



Genus P^elobius. 

 1. P. Hermanni. 



Genus Acilius. 



1. A. sulcatus, Linn. A. scoticus, Steph. III. 



2. A. fasciatus, Degeer, Erich., Steph. Man. A. canaliculars, 

 Nicol., Steph., Aube. A. caliginosus, Curtis. A. sulcipennis, Sahib. 

 A. dispar, Zieg. Not so abundant as A. sulcatus. Whittlesea 

 Mere ; near Edinburgh. 



Genus Hydaticus. 



1. H. stagnalis, Fab., Gyll., Steph., &c. Long. 14; larg. 7\. 

 The introduction of this species to our lists rests upon two specimens, 

 one taken by Dr. Leach " in a pond near Exeter," the other by the 

 Rev . F. W. Hope " in a pond at Netley." 



(H. austriacus, Dej., Sturm. Long. 12^—13 ; larg. l\— 7|. Closely 

 allied to 11. cincreus; it is however somewhat smaller and more oval; 



