284 Mr. Voulton'' fi f II rtJ I er notes upon the 



each long hair m the four rows. The patches are 

 especially distinct on the dorsal rows, and the larva 

 therefore shows four spots on the back of each abdominal 

 segment in front of the 8th, and two spots on the back 

 of each thoracic segment. Weismann describes and 

 figures similar spots on the thoracic segments of a larva of 

 Smerinthus jwjnili in the first stage. These white patches 

 are the first readily seen shagreen dots. Then minute 

 white spots appear all over the body, which are the 

 white areas round the bases of the smaller hairs. Then 

 by a linear arrangement of the white spots (in which 

 both large and small take part) the essential markings 

 are established (see fig. 2, x B, Plate VII.). The sub- 

 dorsal becomes distinct before the oblique stripes, and 

 the latter are rather faint during the whole of this stage. 

 The white subdorsal is perfectly normal, extending the 

 whole length of the body and bending gently upwards 

 anteriorly in the 1st thoracic segment, and posteriorly 

 into the base of the horn (being continuous with the 

 7th oblique stripe). The subdorsal may be seen to be 

 formed of white dots, which are also present over the 

 whole surface, but are not conspicuous. So also with 

 regard to the oblique stripes, but here there is an 

 interesting relation to the larger spots. The anterior 

 dorsal pair on each segment always form part of the 

 stripes, but the latter, converging posteriorly, fall within 

 the hinder pair. So also the anterior spots only of the 

 lateral rows on each segment fall into the oblique lines. 

 The long hairs can still be seen on the spots while the 

 latter are contributing to the oblique lines. There is a 

 very minute and faint " 8th stripe " in front of the 1st 

 oblique stripe on the 1st abdominal segment. It does 

 not extend downwards far enough to meet the subdorsal. 

 The effect of the series of large dorsal dots on the 

 thoracic segments (two on each) is to produce the 

 appearance of a very indistinct line above and parallel 

 with the anterior part of the subdorsal. This line is 

 also contributed to by the smaller dots. As the small 

 anterior oblique stripe does not reach the subdorsal, but 

 stops at about the level of the hinder end of this 

 indistinct line, there is an appearance of continuity 

 between the anterior stripe and the line. This, however, 

 does not really take place, as the former stripe is pro- 

 longed for a very slight distance below the posterior 

 end of the horizontal line. These markings are very 



