4854 Insects. 



sharper, and in no degree rounded, punctuation of elytra more 

 distinct. Lapland, Finland.) 



5. A. chalconotus, Panz., III., Steph. A. cyaneus, Steph. Must., 

 var. A. montanus, Steph. A. nigro-aeneus, Marsh, Steph., not 

 Erich. A. aterrimus, Steph. A variable and common species. 

 Long. 8—10; larg. 4j— 5j. 



6. A. affinis, Payk., Gyll., Steph., Sturm. C. branchiatus, Bab., 

 Steph. Long. 6j — 7 J ; larg. 3f— 4. Not common. Near 

 London ; Netley, Norfolk, Cambridge. I have found this species 

 more abundantly on chalk than other soils. 



(A. elongatulus, Gyll. Long. 8 ; larg. 3§. Allied to A. affinis, but 

 longer; posterior angles of thorax more rounded, and not pointing 

 backwards towards elytra ; colour of elytra black, with a broad and 

 indistinct margin of brown. Lapland.) 



7. A. striolatus, Gyll., Aube. A-. rectus, Bab. Long. 8 ; larg. 4j. 

 Oval, elongated, rounded behind, black, scarcely shining; head black, 

 with labrum and two spots in front ferruginous ; antennae and palpi 

 ferruginous; thorax black with narrow lateral margins of yellow, 

 covered with linear impressions pointing in all directions ; elytra with 

 impressions less distinct: black, without spots, with three almost 

 obsolete lines of punctures ; legs ferruginous. This insect, by 

 some oversight, is omitted in Schaum's list: according to Babington 

 (Ann. Nat. Hist. vol. vi. p. 54) it was first discovered in Horning 

 Marshes by the Rev. J. L. Brown, in March, 1839 ; and again in 

 March, 1840. In May, 1855, I took a single specimen in the same 

 locality. 



(A. vittiger, Gyll., Erich. Long. l\ ; larg. 3|. Body more oval, 

 less parallel than A. striolatus ; thorax simply and distinctly reticu- 

 lated ; elytra more convex; black, with a short longitudinal line, 

 hardly visible, placed near the middle of length, and some distance 

 from external margin. North of Europe.) 



(A. melanarius, Aube. Long. 8j ; larg. 4f . Differs from A. strio- 

 latus by its rather larger size, form more oval, the less generally 

 longitudinal direction of the linear punctures on elytra, and also by 

 a ferruginous narrow band at their margin, visible only when the 

 insect is wetted : differs from A. vittiger, among other peculiarities, 

 by the frequent linear impressions on thorax, pointing in all direc- 

 tions, as in A. striolatus.) 



8. A. paludosus, Fab., Gyll., Steph. A. striolatus, Steph., not 

 Gyll. Not rare : generally found throughout the country in running 

 water. 



