324 Mr. 'P onlton' s further notes upon the 



parent, and allows the green fluid within to shine through. The 

 termination consists of two tubercles, from each of which a single 

 bristle projects. 



Fig. 2, X 3 diam. — A larva of 8. ligustri at the close of the 

 first stage, extended in walking. The horn is somewhat longer 

 in this individual, and is now held straight, sometimes at the angle 

 shown, and sometimes parallel with the back. The larva is now 

 bright green, and shows the (white) markings of the stage, — a 

 subdorsal and the system of oblique strijies. These markings are 

 formed by the linear arrangement of minute white shagreen dots 

 that cover the body (not shown), and of larger dots at the bases of 

 some of the long hairs. The two kinds of dots are essentially 

 similar, for the smaller ones also terminate m minute haii's (seen 

 with a lens). Before these markings were established there was a 

 stage when the dots at the bases of the larger hairs became con- 

 spicuous, especially in the case of the dorsal rows, so that most of 

 the segments showed four large white spots when looked at from 

 above. On the thoracic segments there were only two such spots. 

 These spots can still be seen in the figure, some of them taking 

 part in the stripes, while some are outside the latter. The sub- 

 dorsal is more distinct than the stripes, and is entirely made up of 

 the smaller dots. A very faint and small "8tli stripe" is seen 

 upon the 1st abdominal segment above the subdorsal. There is a 

 horizontal line upon the thoracic segments parallel with and above 

 the subdorsal. It is chiefly formed by the single pair of large dots 

 upon each segment, and on a superficial examination it looks like 

 the anterior contmuation of the 8th stripe. This, however, is not 

 really the case, as the latter is prolonged slightly below its posterior 

 termination. 



Fig. 3, X 2 diam. — A larva of S. ligustri at the close of the 

 second stage, comfortably extended at rest. The larva much 

 resembles that shown in fig. 2. The movable horn is brownish 

 red, covered with black tubercles (shagreen dots), which are absent 

 at the sides of the base, and thus cause the appearance of a reddish 

 patch where the 7th stripe enters the base of the horn. The tip is 

 still bifid, but less markedly so. The fork is due to two pronounced 

 tubercles with the hairs upon them. The origin of the larval 

 markings from the arrangement of shagreen dots is very obvious. 

 The dots terminate in minute hau-s at this time and in future 

 stages. The long haii-s have now disappeared, and so also have 

 the large spots, except those that enter into the " 8th stripe" and 

 the line above the subdorsal. The latter is now less distinct, 

 except anteriorly, while the oblique stripes are very clear. There 

 ia a pink tinge upon the thoracic legs, claspers, and spiracles. The 

 shagreened head is surrounded by a marginal white line. 



