Insects. 4861 



from H. platynotus in its more parallel form ; more depressed ; sides 

 of thorax less rounded; punctuation of elytra more decided, of head 

 and thorax more fine. France.) 



20. H. latus, Steph., Curt. H. ovatus, Sturm, Erich., Aube. 

 H. castaneus, Heer. Long. 4f; larg. 2f. Marston Lodge, York- 

 shire, Rev. G. T.Rudd: " Ouseburn in July," hold's Catalogue of 

 Northumberland Insects; Mr. Bold, who has recently taken it, has 

 kindly supplied my cabinet with examples. 



21. H. palustris, Linn., Sturm, Steph., Erich. H. sexpustulatus, 

 Fab., Gyll., Aube. H. lituratus, Fab., Panz. H. proximus, Steph. 

 III. H. cambriensis, Steph., Curt. The most common, and also 

 one of the most variable of our Hydropori : I have specimens from 

 Argyleshire perfectly black. Long. 4; larg. 2. 



22. H. vittula, Erich. H. ambiguus, Aube. H. nigrita, Steph. 

 Nowhere abundant; sparingly in Norfolk, May, 1854; near Oban; 

 Whittlesea Mere; occasionally near London. Long. 2§; larg. If. 



23. H. xanthopus, Steph. H. planus, Steph. Man. H. flavipes, 

 Steph. III., not Fab. H. lituratus, Brulle, Aube. In abundance 

 at Southend ; near London ; Hertford, Ripley, Norfolk, Wandsworth 

 Common, Ely. Long. 3|— 3| ; larg. If— 2. 



(H. limbatus, Dalh. Long. 4j; larg. 2^. Allied to H. xanthopus ; 

 differs in its markings on elytra; may also be distinguished by its 

 larger size, more abundant pubescence ; anterior of head and sides of 

 thorax more distinctly ferruginous; antennae entirely testaceous. 

 France.) 



(H. analis, Aube. Long. 3f ; larg. 1-|- Differs from H. xanthopus 

 in its markings on elytra ; transverse band at base of elytra not so 

 broad, or represented by one or two spots; more narrow form; pu- 

 bescence more abundant: differs also from H. xanthopus and 

 H. limbatus by punctures on abdomen, which are close and fre- 

 quent, whereas in these two species they are rare and isolated. 

 France.) 



(H. marginatus, Dufts., Aube, Fairmaire. Long. 4 J. Head black, 

 vertex and anterior red ; thorax black, with broad, testaceous or ferru- 

 ginous lateral margins ; elytra dark brown or reddish ; at their base 

 a testaceous broad irregular transverse band, which is continued 

 along the margins of elytra; body beneath black; legs ferruginous 

 or testaceous. France, Germany, Spain. This species I took in 

 England at Woburn Sands, Bedfordshire, September 3, 1848. 1 do 

 not, however, introduce it into our lists until it has actually been com- 

 pared with examples in the foreign cabinets.) 



xiii. 2 u 



