40 YORKSHIRE NATURALISTS UNION. 



4. Central. — Askham Bog, 1856 ( JV. Hey, ZooL, 1857, 

 XV. 541 1, and H. Hutchinson, E. M. M., June, 1872, 

 ix., 12); Strensall, March 1885 {W.C.ff.). 



5. S.W. — With H. tristis in a small pond or tarn on 

 Midgeley Moor near Hebden Bridge, July, 1852 {T. V. 

 WoIIaston, ZooL, 1855, xiii. 4655). 



Hydroporus rufifrons Duft. Another of the Askham Bog 

 rarities, and almost confined to it in Britain. Notices of 

 its capture will be found in ZooL, 1857, xv. 541 1, and in 

 E. M. M., May 1868, iv. 283; both written by the late 

 , Archdeacon Hey. Also mentioned, in E. M. M., June, 

 1872 {H. Hutchinson). This species affects shallow grassy 

 pools which only exist during winter, audit sometimes appears 

 in them in immense numbers. In September, 1881, dur- 

 ing the visit of the British Association to York, I took some 

 of the entomological members up to the bog, and they were 

 greatly delighted by finding this scarce insect in great 

 numbers in pools caused by the heavy rains which prevailed 

 at that time. I found it all through that winter, but on 

 March 9th, after heavy floods, it appeared in numbers 

 almost incredible. It disappeared in May, and I have 

 never taken it very plentifully since that year. It is gener- 

 ally in company with another scarcebeetle, Agalms nliginosus. 

 4. Central.— Askham Bog ( W. Hey, W. CH., HH). 



Hydroporus erythrocephalus L. Very abundant in the 

 York district, and probably elsewhere. 



2. N.E.— Coatham and Marske {W.CH.). 



4. Central.— York (/^C.^y.). 



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

 Hydroporus lituratus F {=xa7ithopus, Steph.). Common 



in York district. 



2_ N.W.— Studley {E. A. Waterhouse, 1879). 



4. Central.— York {W.CH.); Askham Bog, 1871 

 (ZT. Hutchinson). 



2_ S.W.— Sandal, near Wakefield (^. ^. Wrigglesworth). 



Trans. Y.N. U., 1885 (pub. 188S). Series D. Vol. 3. 



