202 HEY: WATER-BEETLES TAKEN NEAR AYTON. 
Hydroporus palustris. Abundant in ponds; also in the river. 
Hydroporus erythrocephalus. Rather abundant in ponds. 
Hydroporus memnonius. A single specimen in a boggy hole 
near Cornelian Bay, and another at Seamer. 
Hydroporus nigrita. Unusually common in this district, 
especially near the coast. I took it as early as January at 
East Ayton. 
Hydroporus discretus. I took two examples of this rare species 
in a small puddle at Filey. It was in company with its near 
ally, H. nigrita, from which it is only readily distinguished 
under rather a high power, by the smooth surface of the elytra 
between the thicker and deeper punctures. 
Hydroporus pubescens, Only scarce, apparently. I have not 
aken more than two or three examples, and these at different 
times and places. 
Hydroporus planus. Rather common in various ponds at Ayton. 
Hydroporus oblongus. As this is one of our rarest Dytiscide, 
I was much pleased at finding above a score of specimens in 
a mossy swamp near Seamer. Canon Fowler only gives three 
British localities for this species, Cambridge, Horning Fen, and 
Askham Bog. It is much scarcer at Askham than in the new 
locality. It is also remarkable that whereas at Askham, it is 
chiefly taken in February and March, I took the Seamer 
specimens on June 12th. 
Agabus guttatus. Taken at Langdale End in May in a small 
puddle receiving a streamlet. 
Agabus uliginosus. I have taken three specimens of this rare 
beetle near oe one of them a female of the dull form 
peculiar to Brita 
Agabus apiece Two examples at Seamer. 
Agabus sturmii. In the moat in March, and in other ponds. 
Agabus bipustulatus. Common and general. 
ST maculatus. In rapid parts of the river Derwent from 
Hybius fulipinosaa. In the river at Ayton, at Brompton and at 
Ilybius ater. In a pond at East Ayton in June. 
Colymbetes fuscus. In the Castle moat. 
Hydrobius fuscipes, The commonest water-beetle in the district. 
Anaczna globulus. Common and general. 
Laccobius sinuatus, Filey. Gale: 
Naturalist, _ 
