100 



MR. E. G. BOULENGEJ! ON COLOUR-CHANGES 



In January of this year (1920), I was given a pregnant Sala- 

 mander of the variety tceniata, which I was informed was 

 received from Western Germany. In this specimen (see text- 

 fig. 1), in which neither the black nor the yellow can be said 

 to predominate, the dorsal spots are confluent into broad bands 

 along each side. 



On February 2nd this Salamander gave birth to 32 young, 

 and half the larva? were immediately placed in aquaria 16 inches 

 square, entirely painted orange-yellow, whilst the other half 

 were placed in similar aquaria painted black all over. In the 



Text-figure 1. 



course of their laryal life 12 of these young Salamanders died, 

 7 of those placed in the yellow aquaria, and 5 of those in the 

 black aquaria. Of these, however, two in each set died only just 

 prior to transformation, having developed the yellow and black 

 pigments of the perfect animal. It will be observed from the 

 figures on Plates I. & II. that in these experiments the results 

 obtained by Secerov were fully confirmed, the majority of the Sala- 

 manders which had been kept in yellow surroundings when in 

 their larval condition being on transformation yellower than the 

 mother, and the spots larger and fused together : the Salamanders 



