29 



resulting from larvae fed upon Arabis perfoliata, Lamk., the 

 Smooth Tower Mustard. 



" In addition to his differentiation in the larvae, he says 

 that the orange in the male imago is more fiery on the upper 

 side than in the type ; whilst on the under side the space 

 between the base of the wing and the orange tip is shaded 

 with sulphur yellow, and in the female the upper side of the 

 hind wing is slightly yellow. 



"On reading this brief description, I was at once reminded 

 of some specimens which I captured in Suffolk, and on 

 examination these appear to be very similar to the form 

 mentioned, and which Herr Hoffman considers sufficiently 

 distinct from A. cardamiiies to be named Anthocharis alherti. 

 These specimens are now shown, the first five being from 

 Suffolk, June, 1891. Specimens Nos. i, 2, and 3 (males) 

 all show the sulphur-yellow marking on the under side of 

 the fore-wing. No. 2 rather more intensely than the others ; 

 and Nos. 4 and 5 (females) show a slight yellowish suffu- 

 sion of the upper side of the hind wings, whilst this also 

 occurs in No. i, a male, though this is not one of the 

 characteristics mentioned by M. Albert. No. 6, a male, 

 from the neighbourhood of Edgware, shows the yellowish 

 under side, whilst Nos. 7, 8 and g, from Edgware and Horsley, 

 seem to be typical specimens, and are here shown for the 

 purpose of comparison. 



" These are selections from a fairly long series of my own, 

 but I would point out that the characteristics of this sup- 

 posed new species occur sparsely amongst specimens from 

 nearly all the localities which I have represented, though 

 more numerously amongst those from Suffolk. The Rev. 

 C. A. St. Johns, in his ' Flowers of the Field,' says that 

 Arabis perfoliata {Turritis glabra) grows most commonly in 

 Norfolk and Suffolk, and therefore there may be a connection 

 between this plant and the form of^. cardamines referred to, 

 it being probably a phytophagic variety, as Mr. Tutt sug- 

 gests ; but it would be interesting for every one to make 

 a careful examination of their series, especially if the speci- 

 mens have been bred, so that more evidence may be adduced 

 either for or against Anthocharis alberti. 



" My own idea is that this is a form that one would 

 expect to get from a larva fed upon an abundance of 

 nourishing and stimulating food, and that the suffusion of 

 orange colouring is probably the effect due to excess of 

 energy resulting from the aforesaid cause." 



