42 YORKSHIRE NATURALISTS' UNION. 



4. Central. — Strensall Common ( IV. Hey and H. Hut- 

 chinson); Askham Bog, March 1882 {W.C.H). 



Hydroporus umbrosus Gyll. 



4. Central. — Askham Bog, 1856 (JK Hey); and 187 1 

 (H. Hitchinson) ; also recorded as taken on March i8th, 

 1868, in the same locaUty ( W. Hey, E. M. M., May 1868, 

 iv. 283); Strensall, 1882 (JV.C.H). 



Hydroporus obscurus Sturm. 



4. Central. — Askham Bog, 1856 ( IV. Hey) ; and 187 1 

 (H. Hutchinson). 



Hydroporus vittula Er. 



4. Central. — Askham Bog {W. Hey and H.H., 1871). 

 Hydroporus palustris L. This is unquestionably the com- 

 monest species of the genus in Yorkshire, abounding even 

 in the most temporary puddles, and throughout the year. 



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



2. N.E. — Scarborough, Marske, Coatham (JV.C.H.) ; 

 Gormire (W.C.H). 



3. N.W.— Studley (^. A. Waterhouse). 



4. Central. — York ( W. Hey); Strensall, Sheriff Hutton 

 {W.C.H.). 



5. S.W. — Wakefield district (E. B. Wrigglesworth). 



Hydroporus angustatus Sturm. Local, but common near 

 York. 



4. Central.— Strensall ( Jf^Ci/.) ; Askham Bog, 1856 

 and 1868 {W. Hey); and 187 1 (// Hutchinson). 



Hydroporus scalesianus Steph. This species was only 

 known as British by a single specimen in Stephens' cabinet 

 (said to have been taken by Mr. Scales, near Swaffham, in 

 Norfolk) until rediscovered by the late Archdeacon Hey at 

 Askham Bog in the year 1856 (see Z?^/., 1856, xiv. 5178). 

 A single spot in Askham Bog is still the only known British 

 habitat of this species. It frequents the mossy margin of 

 a shallow pond and may be taken in some numbers in the 



Trans. Y.N.U., 18S5 (pub. 1S8S). Series D. Vol. 3. 



