( xcix ) 



Dr. T. A. Chapman exhibited a. long series of Ccenonymj)ha 

 matheioi, Tutt ( " Ent. Rec." xvi, p. 308), from different places 

 in the north-west corner of Spain (Galicia), and read the 

 following note : — 



"Showing much variation within certain limits, these 

 specimens raise the question whether they belong to a species 

 distinct from C. dorus. They come from an area whose 

 limits are 30 miles from north to south and 140 from east 

 to west, and throughout this area are fairly uniform, i. e. 

 the variation in the direction of dorus is not greater in 

 the most eastern specimens than in the others. They are 

 smaller than dorus, and all show the difference that most 

 characteristically separates them from dorus, viz. in dorus 

 the white band on the under-side, common to so many 

 Ccenonymphas, extends to the margin and includes the 

 eye-spots : in mathewi it does not pass the eye-spots, the re- 

 mainder of the wing to the margin being of the same ground 

 colour as the rest of the wing., in this respect it is nearer the 

 generic type than dorus, in many specimens however this area 

 contains a pale patch. The generally darker upper-side and 

 the want of the silver line beneath, ai^e also marked differ- 

 ences. At Bejar, 180 miles south, I found fairly typical 



dorus. In the Cantabrian region neither form was seen. 

 " Mathewi is a coast and mountain species. Dorus is not a 



low level insect so far as I have met with it. 



" It would follow therefore that the area of distribution of 



mathewi is continuous with that of dorus if at all, only through 



central Portugal. 



" Portugal has a special form of dorus mentioned by 



Staudinger under the name of bieli. I have not seen this 



form, but Staudinger's note shows that it differs from dorxis 



in the direction of mathewi. 



" An examination of the ancillary appendages shows them 



to be practically identical in form, but that those of mathewi 



are nearly 20% smaller than those of dorus. 



" In conclusion, though I doubt the possibility of dorus 



and mathewi being directly syngamic did occasion offer, I 



think it very probable, that they are so by the mediation of 



transition forms in the regions connecting their proper areas- 



