4858 Insects* 



4. H. pictus, Fab., GylL, Steph., Aube. Abundant throughout the 

 country. H. arcuatus, Fab., Panz. Long. 2j ; larg. 1 J. 



(H. fasciatus, DahL, Dej. Cat. Long. 2j — 3; larg. lj — If. Black, 

 almost impunctate ; thorax with lateral margins ferruginous; elytra 

 rufo-testaceous, with very narrow border at base ; suture, two trans- 

 verse bands and lateral margin black. France.) 



5. H. lepidus, Oliv., Schon., Aube. H. scitulus, Steph. Not un- 

 common in fens, affects muddy ditches and pools. 



6. H. confluens, Fab., Panz., Gyll. Long. 3j ; larg. 2. 



(H. nigrolineatus, Stev. H. blandus, Germ. H. enneagrammus, 

 Ahr., Sturm. Long. 4; larg. 2. Shining; head, thorax, elytra, pale 

 yellow; in the latter the suture and four lines clear black; body beneath 

 black; legs testaceous ; form longer than H. confluens. Russia and 

 central Europe.) 



(H. pallens, Mannerh. Long. 3j; larg. If. Subconvex, deeply 

 punctured; testaceous; anterior and posterior margins of thorax 

 somewhat darker; elytra somewhat elongate, with two punctured 

 stria?; the suture and a line on exterior margin hardly darker; body 

 beneath black; legs testaceous. Lapland.) 



7. H. rivalis, GylL, Aube. H. fluvatilis, Steph. Common in 

 streams in the North of England. Long. 3; larg. If. 



8. H. Sanmarkii, Sahib. H. assimilis, Gyll., Aube, Steph. This 

 insect is absolutely the same as H. rivalis, GylL, in everything but 

 colour. I believe it will be found to be a variety. 



9. H. septentrionalis, GylL, Aube. H. alpinus, Kunz., Steph. 

 Found occasionally with H. rivalis, but more sparingly ; it may be 

 distinguished at once by its longer form. Long. 3j; larg. if. 



(H. alpinus, Payk., GylL, Germ. H. bidentatus, GylL, Aube, ?. 

 H. borealis, Gyll.{}) Long. 4|- ; larg. 2\. Closely allied to 



H. Davisii, somewhat larger ; lateral borders of thorax rounded ; not 

 so depressed ; more narrowed behind ; colour not so dark. North of 

 Europe.) 



10. H. Davisii, Curt^ Steph., Aube. II. borealis, Aube', Steph., 

 not GylL Not uncommon in running streams. Cambridge, Nor- 

 folk, Lincolnshire. Long. 4; larg. 2j. 



11. H. assimilis, Payk., Steph. H. frater, Kunz., Steph., Aube'. 

 H. halensis, Steph. Man. H. areolatus, Steph. III. Common. 

 Long. 4f ; larg. 2j. 



(H. hyperboreus, GylL H. affinis, Sturm. Long. 4 ; larg. 2j. 

 Differs from II. assimilis by absence of any spots on elytra caused by 

 confluence of longitudinal lines; on margin of elytra two small linear 



