200 LIVERPOOL BIOLOGICAL SOCIETY. 
Hydroporus melanocephalus, Steph. Common, and 
generally distributed. 
Hydroporus ngrita, F. Mr. Kinder took a few specimens 
of this usually common species about Kirkdale, and I have 
one taken somewhere in the district. 
Hydroporus celatus, Clark. Some years ago I found this 
usually rare species in water trickling down the clay banks 
at Otterspool. Easily recognised by its entirely red antennse 
and the short and broad anterior tibie. 
Hydroporus melanarius, Sturm. ‘Taken along with 
Gyllenhalw on Simmonswood Moss (J. W.E.). 
Hydroporus tristis, Payk. Simmonswoood, in a ditch by 
the roadside (J. W.E.). 
Hydroporus palustris, L. Abundant. 
Hydroporus angustatus, Sturm. Pits near Westminster 
Road, Kirkdale (F.K.). 
Hydroporus lineatus, F. River Birket, near the Upton 
Road (C.8.G.); Kirkdale (F.K.); abundant at Moreton 
‘CEM RISEP 
Noterus sparsus, Marsh. Local, but common where it 
does occur, as at New Ferry, Liscard, &c. 
Laccophilus minutus, L. Frequent in ponds. 
Laccophilus hyalinus, De Geer. ‘‘ Bidston Marsh and 
Bromborough” (C.8.G.). 
Colymbetes fuscus, L. Common in pits, and very 
abundant in “flashes” of water on the sandhills beyond 
Wallasey. 
Colymbetes Grapu, Gyll. A single specimen, taken in 
Mosslake Fields by Mr. Gregson, is now in my collection. 
Colymbetes pulverosus, Steph. ‘‘Ponds and ditches 
around Old Swan, Knotty Ash, &c.”’ (C.S.G.). 
Colymbetes bistriatus, Berg. Recorded by Mr. Gregson 
as a former inhabitant of Mosslake and Parliament Fields. 
Colymbetes exoletus, Forst. I picked up a dead specimen 
