4532 Insects. 



Colymbetes Grapii. Near Norwich, not uncommon, and also more 

 sparingly in the fens of Huntingdonshire. 



Hydaticus transversalis, Fab. Common in deep weedy ditches 

 throughout fens of Huntingdon and Ely. 



„ Hybneri, Fab. More rarely met with ; two specimens 



from ditches near Holme Station. 



Dytiscus lapponicus, GylL, Aube, Germar, fyc. I have much 

 pleasure in being able to add the above very distinct species to 

 our British Fauna, having captured four specimens on four separate 

 occasions in a small very deep lake in the Isle of Mull, September, 

 1854. I recognised the insect, as soon as I saw it in my net, 

 from its smaller size, and frequent luteous lines along the elytra, 

 as either lapponicus or septentrionalis of Aube, and hence spent 

 many hours in endeavouring to obtain a series of examples. The 

 following extract from Gyllenhall's accurate description will suffi- 

 ciently characterise the species : — " Statura et summa affinitas 

 prgecedentis (marginalis) sed fere duplo minor et distinctus; ely- 

 trorum forma ut in priore, et jam supra nigra, margine late luteo; 

 in disco praeterea lineae plurimae longitudinales, in singulo elytro cir- 

 citer 18, tenues obscure lutescentes, saepe obsolete, quasi e pagina 

 inferiore translucentes." I have little doubt but that D. septen- 

 trionalis will prove a mere variety of lapponicus ; the only difference 

 being, according to Aube, v. 65, that the^female has the smooth form 

 of elytra. 



Gyrinus minutus, Fab. Not uncommon in a small lake near Loch 

 Spelvie, Tsle of Mull. 



„ bicolor, Payk. In abundance at Southend and Sheerness. 



I should be very glad if any of your readers could communicate 

 information respecting H. Scalesianus, Steph. Stephens, Mandib. 

 ii. 57, mentions a pair taken by Mr. Scales in Norfolk, but unfortu- 

 nately does not notice the month or the locality : has it ever been 

 taken since ? According to Schaum and Aube it is extremely local 

 on the Continent. 



Hyd. unistriatus, Illig., is also an insect of which we know little, 

 though taken by collectors occasionally twenty years ago. 



Hamlet Clark. 

 Northampton, October 10, 1854. 



E. NEWMAN, PKINTER, 9, DEVONSHIRE ST., MSHOPSOATE, LONDON. 



