48 YORKSHIRE NATURALISTS UNION. 



N.B. — Agabus affinis Payk. is recorded by Archdeacon 

 Hey from Askham Bog {Zool., 1857, xv. 541 1). His 

 remarks really belong to Agabus unguicularis . A. affinis 

 has been only found in Britain near Dumfries. 



Agabus femoral is Payk. Confined apparently to the York 

 district. 



4. Central. — Askham Bog {H. Hutchinson); Strensall 

 Common, plentiful in 1882 ; perhaps extinct now in conse- 

 quence of extended drainage ( W.C.H.). 



Agabus maculatus L. Generally distributed in suitable 

 localities. This is one of the few species of Agabus which 

 affect clear running water, and is consequently scarce in 

 the plains. 



1. S.E.— Beverley {W.C.H.). 



2. N.E. — Scalby Beck {R. Lawson). 



3. N.W. — Leyburn (IV.C.H.) ; Streams west of Harro- 

 gate ( IV. Hey). 



4. Central. — Boroughbridge ( IV. CH.) ; Goldsborough 

 (JV.C.H.). 



5. S.W.— Wakefield (E. B. Wrigglesworth) ; Hebden 

 Bridge {S. Gibson). 



D YTISCINA. 

 Dytiscus marginalis L. This tiger of our waters is common 

 and general. It is one of the few species of the order 

 which use their wings freely. Consequently it will some- 

 times appear suddenly in numbers in places where it was 

 not known before. It is destructive to young fish, biting 

 pieces out of them most ferociously. 



2. N.E. — Scarborough [R.L.) ; Saltwick (H. Crowther). 



3. N.W.— Studley {E. A. Waterhouse). 



4. Central.— York (IV.C.H.) ; Bishop Wood (A. 

 Denny) ; Askern {Lankester^ 1842) ; Doncaster ( W.E.C.). 



5. S.W. — Leeds ( W. H. Taylor) ; West Riding gener- 

 ally {E. B. Wrigglesworth). 



Trans. Y.N.U., 1885 (pub. 1888). Series D. Vol. 3. 



