NATURAL LOCALITIES OF BRITISH COLEOPTERA. 203 



striolatus and A. tarsatus appear to be almost unique ; A. brun- 

 neus, found by Dr. Power in tlie New Forest, is very scarce, and 

 the local Scotch species A, congener, A. arcticus, and A. affinis, 

 are always in much request. 



The genus Dytiscus is very hard to complete. D. imnctulatus 

 and D. marginalis are common, the latter extremely so, but D. 

 lapponicus is a rare northern insect, and D. circumcinctus and D. 

 dimidiatiis are almost peculiar to the fens, especially Yaxley Fen 

 and Whittlesea Mere, although a single specimen of the latter 

 insect and a few specimens of the former have been found in 

 Askham Bog. It is strange how rare the latter species has 

 become. I have heard an old collector say that he has known 

 it taken literally by pints. 



The Hydatid are all rare, H. cinereus especially so ; all 

 three used ' to be found in the fens, especially in Whittleseg, 

 Mere, H. seminiger being very abundant. 



The Gyrinidfe are a very obscure group, and some of our 

 species are very doubtful ; G. marinus and G. natator are very 

 abundant, and G. urinator is said to be common in the north ; 

 G. minutus is common in Scotland, and G. hicolor is to be found 

 in many places on brackish water. Orectochilus villosus is only 

 found on running water, and is not often seen unless looked for 

 close under the banks, as it comes out by night, and remains 

 hidden by day. . I have found it abundantly on the banks of the 

 Dove, near Repton. 



The School House, Lincoln. 



[Hydroporus ohlongus was originally found by me at Cam- 

 bi'idge, and afterwards in the Norfolk fens. 



Hydroporus latus. — I have seen in two places: one is a rapid 

 stream, not far from Tilgate Forest ; the other is a stream in 

 Tilgate Forest. ' In both it was abundant : I got about 200 

 specimens in the two together. 



Gybister Roeselii. — The specimen is now in my collection. Its 

 authenticity is somewhat dubious, but the story of its capture, 

 attached to it, is very definite. 



Agabus striolatus. — I believe was only taken once, and that by 

 my friend llev. Laundy Brown, of Norwich, more than forty 

 years ago. It was in a ditch in one of the Norfolk fens. He took 

 about sixteen of them; six or eight are still in my possessioi). 



