( XXV ) 



nor disproved, and only removed the explanation of the reason 

 of the colour-difference observed in the two forms a step back- 

 ward. It is just as conceivable that originally dark races of 

 coleoptera (and lepidoptera) are now less suitable to their 

 changed conditions (clearance of foi*ests, and consequent 

 lessened humidity of certain areas, etc.), and are being ousted 

 by lighter or more suitable forms, as, in other instances, 

 particularly in wet, smoky, manufacturing districts, originally 

 light races are now less suitable to their changed environment, 

 and are being rapidly ousted by what appears to be more 

 suitable melanic forms. 



The President, Mr. G. A. K. Marshall, and other Fellows 

 joined in the discussion. 



PlERIS MANNI FROM SoUTH FrANCE. Mr. H. EoWLAND- 



Brown exhibited a series of Pieris manni, Mayer, taken and 

 bred at le Vernet, Pyrenees-Orientales, and received by him 

 from M. Rene Oberthiir, calling attention to the superficial 

 differences which presented themselves when compared with 

 imagines of P. rapae. 



New LOCALITY FOR Cassida fastuosa. — Mr. E. 0. Bedwell 

 exhibited a series of Cassida fastuosa taken by him on Boxhill, 

 Surrey, mostly from the leaves of young foxgloves. 



Danaida chrysippus, Linn. — Dr. G. B. Longstafp exhibited 

 a series of 33 specimens of Danaida chrysippus taken by him 

 in Egypt and the Sudan during January and February 1909. 

 Two taken at Cairo, one at Kom Ombo and one at Aswan, were 

 all typical, but somewhat dark. A few other specimens were 

 seen at each of these localities, but none of them had white 

 hind-wings. At Khartum, where the butterfly was fairly 

 common, 25 specimens were taken : of these two might be 

 described as typical, though lighter than the Egyptian speci- 

 mens ; in eight the veins near the middle of the hind-wings 

 were dusted with white scales; in seven the centre of the 

 hind-wings was more or less white, as in Moore's alcippoides ; 

 while seven might be described as typical alcippus, Cram. One 

 specimen only was seen of the form dorippus, Klug, and this 

 had the hind-wings almost entirely white — f. albijius, Lanz. 

 So far as could be estimated in the field, three-fourths of all 

 the specimens seen at Khartum were either alcippus or alcip- 



