of certain lepidopterous larr<^ and piipce. 29 



8th, 9th, and 10th segments, and a very slight one on 

 the 6th segment, and on the 11th of the right side 

 only. 



Thus the spiracular row contains the greatest number 

 of spots, but I beheve that the highest row is generally 

 best developed, especially in the size of the spots. 



It seems perfectly obvious that we have (here at least) 

 markings which bear no relation to the coloured borders 

 of the obHque stripes. We have a system of three rows 

 whose spots form alternating series, and only the spots 

 of the highest row are placed in front of the oblique 

 white stripes, in the position of the coloured borders 

 found in the genus Sphinx. And the highest spots show 

 no tendency to become drawn out into oblique lines. 

 One spot only, and that belonging to the spiracular row, 

 communicates a faint tinge of red (not shown in the figure) 

 to the last white oblique stripe ; but this tinge shows no 

 tendency to separate as an anterior coloured border, 

 and the spot which communicates it is placed behind the 

 oblique stripe. These observations and conclusions are 

 also entirely in accordance with what I remember of the 

 spotted varieties of these two larvae. At the same time 

 a darker shade of the ground colour forms a very 

 distinct border to the anterior edge of each oblique 

 white stripe, and greatly increases the efficiency of the 

 protective resemblance to leaf-veining. 



I shall presently show reasons for the belief that the 

 coloured borders of Sphinx correspond to these green 

 edges, which are distinct in all larvse of Smerinthus 

 ocellatus, whatever be the shade of the ground colour. 



Since writing the above I have seen figures of the 

 spotted variety of S. tilice. The spots certainly show a 

 great tendency to become drawn out into stripes in this 

 species, but such a tendency does not seem to be general 

 in this form of marking, for it is not exhibited in S. 

 pojmli, in which the spots are often developed to an 

 extent never reached by S. tilice. 



Through the kindness of Mr. G. C. Bignell, who has 

 lent me his original painting for the purpose, I am now 

 enabled to add a figure of an extreme variety of S. 

 popidi. This is shown in PL I., fig. 2, and the specimen 

 is remarkable for its very light ground colour, as well as 

 for the unusual development of the spots. Although 

 the spots are developed to a greater extent, especially 

 anteriorly, than in any specimen I have found, yet 



