272 [December, 



extending over the whole, but the more scarce, local, and interesting 

 species being usually limited to one of these geological series. Every 

 entomologist of any experience knows, for instance, bow many species 

 are found upon the chalk, in plenty, which are either unknown upon 

 other formations or only seen as casual visitors. Kent is divided into 

 the same formations, in much the same order but in different propor- 

 tions, and with, in addition, chalk and greensand again in the extreme 

 south. In Sussex the order as in Surrey is reversed ; in Hants and 

 Dorset the wealden is omitted, while in the latter the oolite appears, 

 and provides a rich entomological locality in the Isle of Portland. Now 

 we have a list for the Isle of Portland, all the species in it therefore 

 occur upon oolite. But oolite (with the allied sand and clay strata) 

 runs in some form through portions of Dorset, Somerset, Gloucester- 

 shire, Buckinghamshire, Northamptonshire, into Lincolnshire; and in 

 the series most closely allied to that of Portland further into Dorset, 

 as well as into Wilts and Bucks. 



Of how great interest would be a catalogue, with localities, of 

 the Lepidoptera of this whole oolite district, and particularly of that 

 of the Portland series ! 



Again, there is chalk, as already alluded to, in Kent at Margate 

 aud Ramsgate, from Deal and Dover through that county, and Surrey, 

 narrowly to Farnham, where it spreads out broadly into North Hants, 

 northward into Berkshire, westward into Wilts, but also turns south- 

 ward and back to the south-east by Bishop's Waltham, Midhurst, 

 Arundel, to Brighton, Newhaven, and Beachy Head. From Wilts 

 westward it occupies a large portion of Dorset ; and on the north by 

 a narrow passage between the London clay and the greensand, extends 

 round into North Berks, Oxfordshire, Hertfordshire, Cambridgeshire, 

 and through the western portions of Essex, Suffolk, and Norfolk, to 

 near the sea at Holkham and Blakeney. Across the Wash it appears 

 again at Burgh, passes in a rather narrow strip northward through 

 Lincolnshire to the Humber, re-appears beyond Hull, and occupies a 

 large portion of the east of Yorkshire to Filey and Flamborough Head. 

 Now taking Polyommatus Corydon, P. Alsus, and P. Adonis, Hes- 

 peria comma, Agrotis cinerea, Acidalia ornata, Melanippe rivata and 

 M. procellata, Phihalapteryx tersata and P. vitalbata, Euholia hipimc- 

 taria, Phoxopteryx comptana, Argyrolepia subbainnanniana, Pancalia 

 LeuwenhoeckeUa, Parasia carlinella, and many other well known chalk 

 species which do not occur to me afc this moment, what an interest 

 there will be in tracing the course aud limits of each species ; how 

 faithfully it accompanies the chalk, whether it extends to the bordering 



