hey: list or Yorkshire coleoptera. 49 



Dytiscus circumcinctus Ahr. About twenty years ago, when 

 I was with Archdeacon Hey at Askham Bog,^ we took a 

 single specimen of this insect, the only one, I believe, ever 

 taken in Yorkshire. It was obtained when using the net 

 in deep water (wading up to the thighs). The specimen 

 belongs to the anomalous form characteristic of this 

 species — a smooth-backed female. 



4. Central. — iVskham Bog, one example ( IV. Hey). 

 Dytiscus punctulatus F. Generally distributed but rather 

 scarce. 



2. N.E. — Marton, 1829, 'not of very frequent occur- 

 rence' (Z. Rudd, Stepli. III., June 15th, 1829, ii, 195); 

 Scarborough {R.L.). 



4. Central.— York ( ]V. C. H.) ; Askham Bog {H. 

 Huichifiso7i). 



5. S.W.— Wakefield district {E.B. W.). 



Dytiscus dimidiatUS Berg. Only found in Yorkshire at 

 A.skham Bog, where it was taken in 1830, and where I took 

 a single specimen (a female) in 1882 — the last recorded 

 capture of this noble insect in Britain. 



4. Central. — Askham liog, 1830 {A. Wright, London's 

 Mag., 1831, iv. 165) ; ditto, a single exami)le, March nth, 

 1882 {W.C.B.). 



Acilius sulcatus L. Common and general. 



1. S. E.— Brough {E.B.IV.); Flamborough {W.C.H.). 



2. N.E.— Scarborough (y?.Z.); Coatham (JV.C.H.). 



3. N.W.— Studley {E.A. IV.). 



4. Central.— York( IV.C.IL); Askham Bog ( IV.D.R.); 

 Wetherby {H. Crowther). 



5. S.W.— Wakefield {E. B. W.) ; Hcbdcn Bridge 

 (.S". Gil'son). 



Hydaticus transversalis Berg. Confined to Askham Bog, 

 and now very scarce. The last pair I took there were 

 captured in a deep pond on May 13th, 1885. 



D 4 (vol. 3). 



