WATER-BEETLES TAKEN NEAR AYTON, 
SCARBOROUGH. 
EY. We C.HEY, MA.,; NCGS., 
Vice-President of the Yorkshire Philosophical Society, West Ayton, near Scarborough. 
HAVE investigated the waters of this neighbourhood rather 
industriously during the present spring, and now summarise the 
results of my work. 
Brychius elevatus. Fairly plentiful in rapid parts of the Derwent 
at Ayton, among gravel. 
Haliplus obliquus. In the Derwent at Ayton, not very plentiful. 
aliplus flavicollis. Abundant in the Derwent both in the rapid 
and slow-flowing parts, generally in weeds. 
Haliplus fulvus. Very abundant in Throxenby Marsh. 
Haliplus ruficollis. Abundant in all the ponds and in the river. 
Haliplus lineatocollis. With the foregoing species, though much 
less common. 
_.. obscurus. In the castle-moat and other ponds at 
Colambus sesh erg Abundant in a pond at East Ayton, and 
int 
Calais aiecane ee One specimen taken in a pond 
at East Ayton in March 
Deronectes depresstis. Common in the Derwent above and 
below Ayton in May and June. 
Hydroporus granularis. Not uncommon in some mossy pools 
near Seamer. 
Hydroporus rivalis. In the river at Ayton near the mill-dam 
among shingle in May. Also at Langdale End 
Hydroporus tides viene At Ayton in company with 
fT, rivalis, but much scarce 
Hydroporus lineatus. abesue in the Castle moat and a pond 
at East Ayton from March. 
Hydroporus umbrosus. This very local insect is not uncommon 
in a pond at East Ayton from March to May. 
Hydroporus angustatus. In company with Hi. umbrosus, but 
scarcer. Abundant at Seamer. 
Hydroporus vittula. I took this scarce and local insect in 
abundance near Seamer on June 11th. 
July 1894. 
