50 YORKSHIRE NATURALISTS' UNION. 



4. Central. — Askha.Tnliog,iS2o (A. IVrig/i fin Loi/don's 

 Mag., 1831, iv, 165); ditto, 'in plenty' (H. Hutchinson, 

 E. M. M., June 1872, ix, 12); ditto, 1881 (Sept.), and 

 1885 (May) (/^C.i^). 

 Hydaticus seminiger DeG. {^=hybneri F.). Recorded 

 formerly from Askham Bog, but never found there during 

 the last fifty years. 



4. Central. — Askham Bog, 1830 {A. Wright, Loudon's 

 Mag, 1831, iv, 165). 



GYRINID^. 

 Gyrinus minutus r. Local. 



1. N.E.— Marton (Z. Rudd, Sieph. III., June 15th, 

 1829, ii, 195). 

 4. Central. — Buttercrambe Moor ( W. Hey). 

 Gyrinus natator Scop. Very common and general in ponds 

 and ditches, and conspicuous from its dazzling 'gyrations.' 



1. S.E.— Bridlington (^r.C.^y.). 



2. N.E.-— Scarborough {R.L.) ; Redcar ( W. C.H.) 



3. N.W.— Studley {E.A. W.). 



4. Central. — York (W.C.H); Riccall and Pannal 

 {W.D.R.). 



5. S.W.— Hebden Bridge {S. Gibson); Leeds {W. H. 

 Taylor) ; Wakefield {E.B. IV.). 



Gyrinus marinus Gyll. Locally abundant. 



I. S.E.— Bridlington Quay {W.C.H). 



4. Central. — Askham Bog, March, 1882 {IV. C.H). 



Note. — In the Zoologist for 1846, iv, 1238, this species 

 is vaguely stated to occur 'in the Ouse' {T.y. Bold), in 

 all probability the Newcastle stream called 'Ouse Burn.' 

 Gyrinus opacus Sahl. Perhaps only a variety of the last- 

 named species. It has only once been taken in Yorkshire. 



I. S.E.— Beverley, June, 1882 {W.C.H). 



Note. — Some records of the capture of Gyrinus bicolor 

 Payk. {Nat., Dec, 1878, iv, 74, and Nat., Sept., 1S79, v, 



Trans. y.N,U., i8go (pub. 1891). Series D, Vol. 3. 



