224 A CATALOGUE OF THE LEPIDOPTERA OF 



cient to justify me in transporting it even the few yards neces- 

 sary to bring it across the Tees, on the Yorkshire shore of which 

 river, near Darlington, it has heen captured by Mr. Backhouse, 

 who, however, cannot be sure that he has taken it in Durham. 

 P. Sylvanus appears at the end of May, and again in August. 

 Scarce and local near Darlington. — Mr. Sang. " Castle Eden 

 Dene." — Ornshy's Durham. 

 The larva is unknown. 



In closing my list of our Butterflies, I would observe that of 

 the entire number of British species, sixty-five, we can lay claim 

 to thirty-five as having occurred within the two counties. Of 

 two thers, Argijnnis Adippe and Pamphila Comma, I only want 

 direct evidence of their certain capture within our limits to add 

 them at once to the catalogue. Of the remaining twenty-eight, 

 fourteen are so very rare, or so very local, and evidently so 

 entirely confined to southern climes, that we cannot look for 

 their occurrence with any reasonable hopes of success. As to 

 the others, I may, perhaps, be excused for directing the atten- 

 tion of the members of the Club to localities which appear to 

 me to hold out a prospect of adding some of them, at least, to 

 our numbers. 



I have alluded above to Erehia Casswpe and its probable oc- 

 currence on the green hills (porphyritic) of the Coquet and the 

 Cheviots. That portion of the range commencing about Redlees, 

 and extending northwards past the Bygate Hall estate, belonging 

 to our very assiduous member Ealph Carr, Esq., and so over 

 towards Alnliam, and the sources of the Alwine and Bremish 

 appear to me to offer the greatest chances for its capture. 



The region occupied by the magneisan limestone, and the new 

 red sandstone extending from Marsden and Boldon to the south- 

 eastern extremity of Durham is, however, by far the most pro- 

 mising ground for examination for species new to our fauna. 

 The numerous habitats within its limits for our present species, 

 as given above, show unmistakeably how prolific it is in Butter- 

 flies as in other insects, as well as i^lants, mollusca, &c. ; in fact 

 it is the " chalk district" of our counties. Here, in meadows and 



