AGRIUS CONVOLVULI. 351 



uniformly 14mm. Third stadium :* (I) The ten pale larvae of stadium 2. 

 — Three of these larvae were bluish-green (like the well-known tint 

 of Smerinthus ocellatus, although not so bluish as the extreme varieties 

 of the latter). One was bluish-green inclining towards intermediate. 

 In describing these larvae those with the smallest amount of the 

 dark markings are, with one exception (the 10th larva) taken first. 



1. The least-marked larva possessed a somewhat lighter horD than that 

 shown in pi. xv., fig. 10 ( x 3); in other respects it was similar, with the yellowish 

 transparent zone near the tip, and the light pinkish area at the side of the base. 

 Red spots, like those of Smerinthus larvae were present ; upon the 7th 

 abdominal segment, the spot was only represented by darkened ground-colour ; 

 upon the 6th abdominal it also possessed a very faint reddish tinge, which was 

 rather more distinct upon the spots on the other abdominal segments, although 

 the red area was always extremely small. There was a faint dark cloud on the 

 anal flap and a dark mark below its lateral margin. Each of the four anterior 

 claspers possessed a dark semilunar mark. The thoracic legs were red, becoming 

 black at the base, and the ridge to which each pair of these legs is attached, was 

 also dark. The first and the last two spiracles were brown, the others very dark 

 brown, producing the effect of black. There were two slight smoky patches, the 

 one anterior, and the other posterior, to each of the spiracles ; especially faint in 

 the case of the prothoracic, and especially pronounced in the case of the 1st 

 abdominal spiracle. Upon the head, the ocellar area was dark, and an almost 

 imperceptible tinge spread upwards from this area over the side of the head. 

 The subdorsal line was faint except in its anterior part ; the oblique white stripes and 

 their borders were also faint, but distinctly visible. No traces of an 8th stripe could 

 be made out, as in the early stages of Smerinthus and Sphinx ligustri. A faint 

 dark tinge was present between the 2nd and 3rd thoracic segments at the spiracular 

 level, and this, spreading outwards, formed a somewhat distinct patch on each 

 side of the larva. This patch was separated from the prothoracic spiracle in front, 

 and the 1st abdominal spiiacle behind, by a distance which corresponded with that 

 between the abdominal spiracles, and thus the existence of an additional spiracular 

 patch, making a complete series with equal intervals, was suggested, as in the 

 case of certain varieties ot S?nerinthus populi (see Trans. Ent. Soc. Lond., 1885, 

 p. 305). The ground colour was yellowish-green beneath, light bluish-green above, 

 the demarcation being sharp, and taking place at the subdorsal level, as in many 

 larvae of Smerinthus ocellatus. A mediodorsal line, somewhat darker than the 

 adjacent ground-colour, was present. 



2. The second larva was rather bluer beneath ; the white stripes and their 

 borders of dark ground-colour were very distinct, as was the whole length of the 

 subdorsal line. The red spots were very distinct but very small, especially on 

 the 7th abdominal segment. The anal flap was without the dark cloud, and the 

 dark marks below it and on each of the four anterior claspers, were very faint. The 

 thoracic legs were paler than in the last individual. Upon the head there was 

 only a faint cloud on the ocellar area. The lateral mark between the 2nd and 

 3rd thoracic segments was present ; the patches on each side of the spiracles were 

 fainter and very slight, and they were entirely absent in the case of the 1st 

 spiracle. On the other hand the 6th abdominal spiracle was dark brown, almost 

 black. 



3. The appearance of the third larva is represented in pi. xv., fig. 10 (x 3). 

 There was a slight dark cloud upon the border to each oblique white stripe, it appears 

 upon the border just as it enters the posterior of the two segments in which its course 

 lies, and just above the level of the subdorsal line. The stripes and borders were 

 less distinct than in the larva last described, but they are represented more distinctly 

 in the figure, so that, in this respect, the appearance of the second larva is given, 

 rather than that of the third. The red spots were much larger than in the two 

 larvae described above. The last spot was much fainter than the others. The head 

 was bright yellowish -green, as in the other bluish larvae, and as in the young 

 bluish or whitish larvae of Smerinthus ocellatus. The dim lateral shade was 



* All the individuals were healthy at the beginning of this stage, except 

 the darkest of those described in the last stage as the division of 10 pale larvae. 

 This larva diedon September 27th. On the 29th, all the larvae were carefully compared 

 and described. The larvae remained shagreened as in Smerinthus and Sphinx 

 ligustri although the character is not represented in the figures. 



