lejndopterovs larvcB and jnqice. 



149 



This history can be traced up to the end of the seventh 

 stage in the ontogeny of S. Ugustri, up to the end of the 

 sixth stage in that of Smerinthvs occllatus, while A. 

 atropos supphes the eighth stage. These stages are 

 arranged successively, but there is no doubt that con- 

 siderable overlap occurs, and in some ontogenies the 

 stages may follow one another in a difi'erent order. 

 Thus stage seven muj sometimes succeed the fourth 

 stage, and the second and third stages may take place 

 together. The succession described above is, however, 

 probably true for the phylogeny, although there may be 

 exceptions or omissions in its short recapitulation m 

 certain ontogenies. It is undoubtedly true that the oblique 

 stripes appeared before their borders and in the manner 

 indicated above ; and that the borders appeared later, 

 although perhaps earlier than the complete fusion of the 

 areas to form continuous stripes. The ontogenetic 

 evidence upon which the first seven stages have been 

 reconstructed will be found in my two papers in the 

 Trans. Ent. Soc. of Lond., Part I., April, 1884, p. 27 ; 

 and Part II., August, 1885, p. 281, together with a 

 complete description of the larva of S. kgustri m all 

 stages, which may be referred to in confirmation of the 

 comparison instituted above between this larva and that 

 of A. atrojjos. 



Since the above was written Lord Walsmgham has 

 kindly allowed me to examine and describe two beautiful 

 specimens of the brown variety of this larva from his 

 collection. I was greatly surprised to find that the 

 markings as well as the colours are entirely difterent 

 from those of the yellow variety. The ground colour of 

 the thoracic segments is light brownish or of a dirty 

 white, and resembles the other variety in being much 

 lighter than that of the rest of the larva, but it is 

 entirely different in the possession of distinct and very 

 dark markings. There is a broad median dorsal band 

 of a very dark brown colour, which is present upon the 

 second and third thoracic segments, and broadens con- 

 siderably towards the intersegmental furrows, and 

 especially towards that which separates these two seg- 

 ments from each other. Except on the anterior and 

 posterior boundaries of the prothorax the band is 

 replaced on this segment by a rather lighter and much 

 broader patch of a brownish colour with dark spots 



