254 THE ENTOMOLOGIST. 



fulvous, half white. Mr. S. Webb has both sexes of a clear 

 silvery white, the female combining with this the other variation 

 of large extra spots in the fore wings ; also one in which the 

 hind wings are shaded with white from the margins ; and Mr. S. 

 Stevens, besides a silvery white female, taken at Torquay, and 

 another of the same sex in which the marginal band has dis- 

 appeared, has a male without tbe subapical black spot." 



All the instances mentioned above are ground colour aberra- 

 tions, with the exception of the last but one ; that example, 

 however, must be very different to the specimen now figured. 



Mr. Tutt informs us {infra) that he has a specimen of this 

 species which is somewhat similar to that captured by Mr. 

 Spindler, also parallel forms of Erebia goante. I may mention 

 that a figure of Pararge {Satyrus) egeria in the ' Tijdschrift voor 

 Entomologie,' 1865 (pi. ii. iig. 1), represents a specimen in which 

 the usual dark brown is changed to pinkish ochreous, but the 

 central area of primaries and the costal and upper portion of the 

 outer margin of secondaries are slightly suffused with dusky. 

 The black spots retain their normal appearance. 



R. S. 



ON A LUTESCENT ABERRATION OF KPINEPHELE 



TITHONUS. 



By J. W. Tutt, F.E.S. 



In connection with the lutescent aberration of Ejnnephele 

 tithonus exhibited at the meeting of the South London Entomo- 

 logical and Natural History Society, held on Sept. 9th last, 

 I may mention that I have a somewhat similar specimen of this 

 species, and also parallel forms of Erebia goante, in which the 

 dark colour is reduced and altered, although the orange portions 

 of the wing remain normal, and, by comparison with the pale 

 surrounding area, appear redder than it usually does in these 

 species. Further, I have an exactly parallel aberration of 

 Angerona 2>mnaria. All these aberrations are without doubt 

 quite natural ; but in the course of some experiments which 

 I carried out with Mr. Coverdale some fifteen years ago, we dis- 

 covered that the black-brown of Epinephele was very inconstant, 

 and liable to change. With regard to the probable interpretation 

 to be put on these natural aberrations, in the light of our 

 previous experiments, I made the following remarks in ' The 

 British Noctuae and their Varieties' (vol. ii. pp. ix-x, 1891) : — 

 " Perhaps one of the most interesting results with an alkali is to 

 get a direct development of yellow leading up to the brown, as 

 exemplified in typical Coenonympha pamphilus, C. davus, &c. 

 Under the action of ammonia the pale under sides and fringes of 



