o [Juno, 



member how very local many insects are even on land, and how they 

 may be found in profusion within a few yards, while, outside that line, 

 not a specimen is to be taken. 



In compiling the following list, I have been greatly assisted by 

 Archdeacon Hey and his son, the Rev. W. C. Hey. I have inserted 

 common as well as rare species, as in many cases the species that 

 abound elsewhere are conspicuous for their rarity. 



The list contains 40 Hydradepliaga and 20 Pliilhydrida, besides 

 other rare beetles. 



HYDRADEPHAGA. 



Haliplus obliquus, F., rare; I have only found one specimen. H. rujicollis, 

 De G., abundant. 



Hyphydrus ovatus, L., abundant in Askham Bog ; unknown in Chandler's 

 Whin, until I took a single specimen on April 30th last. 



Hydroporus incequalis, F., not very common. H. decoratus, Gyll., abundant, 

 but confined to Chandler's Whin ; this is by no means a common insect elsewhere ; 

 Stephens (Illust., ii, 41) says that he only knew of one or two British specimens. 

 H. granularis, L., verv abundant. H. dorsalis, F., apparently not very common. 

 II. oblovgus, Steph., rare, but can generally be found ; it is apparently an early 

 spring insect. H. rufifrons, Duft., rare ; only found in a stream running along one 

 side of Askham Bog proper. H. erythrocephalus, L., very common. H. lituratus, 

 F., not common. H. planus, F., very abundant. H. melanocephalus, Steph. (pnbes- 

 cens, Gyll.), common. H. nigrita, F., not common. H. tristis, Pk., not common. 

 II. obscurus, Sturm, common. H. vittula, Er. : it is doubtful whether this insect 

 has ever been found in the Bog ; I am inclined to think that another species has 

 done duty for it. H. palustris, L., conspicuous by its rarity in Chandler's Whin ; 

 common elsewhere. H. angustatus, Sturm, not uncommon. H. Scalesianus, Steph. : 

 Stephens named this 6pecies after Mr. E. Scales, who took two specimens in Norfolk 

 (Tllust., ii, 57) ; this locality was, however, lost, and the insect was never again found 

 until Archdeacon Hey discovered it in Askham Bog, or rather Chandler's Whin ; it 

 is always rare, but may be taken sparingly at certain times of year, it seems to be 

 attracted by cow-dung in the water ; Chandler's Whin is, as far as I know, the only 

 British locality, at present known, for this species, which appears to be rare on the 

 continent. H. lineatus, F., common, but local. 



Noterus sparsus, Marsh., abundant. 



Laccophilus minutus, L., not very common. 



I lybius fuliginosus, F., common. /. ater, De G., common. I. obscurus, Marsh., 

 not uncommon. I. guttiger, Gryll., not uncommon. 



Colymbetes fuseus, L., apparently rare ; I have not seen a specimen in the Bog 

 myself. C. Grapii, Gyll., rather common ; more frequently met with than any 

 other Colymbetes. C. exoletus, Forst., rather common. 



Liopterus rujicollis, Schal. (Agabus agilis, F.), rather common ; this used to be 

 considered a rarity, but seems now to be common : I have taken it both at Askham 

 Bog and near Lincoln, not uncommonly this year. 



Agabus bipustulatus, L., not abundant, as it usually seems to be in most places. 

 A. chalconotus, Pz., has occurred. A. Sturm i, Schon., not common. A. uliginosus, 

 L.j rare. A. undulalus, Schr. (abbreviatus, Steph.) : this, perhaps the prettiest of 



