292 Dr. T. A. Chapman's Contribution to 



pale reddish brown (dark) over greenish contents. The dorsal 

 trough is dark, the dorsal flanges (apart from hair bases) pale. 

 The subdorsal and supra-spiracular areas are still separated by a 

 pale line or band, but this and the pale sjiaces in the two areas are 

 smaller and less defined, so that the dark areas much predominate; 

 below the spiracle is a dark area, then the jjale lateral flange and a 

 dark area below this, the venter being pale. 



The increased armature of hairs, lenticles, etc., is shown 

 in the photograph of the skin in this (second) instar on 

 PL XXXIX. 



Sept. 5. In 3rd instar it has a length of about 3 mm. (at rest) 

 or up to nearly 4"00 if stretched; the hairs are more numerous, 

 but proportionally (and actually ? ) shorter than in 2nd instar. * The 

 outline is much the same, both in this and previous instar it is less 

 angular and more rounded as the larva feeds up. The colouring is 

 very similar; there is the pale flange line, and from the posterior 

 end of this (on each segment) a pale line passes obliquely downwards 

 and forwards ; there is the pale lateral flange Une, a pale area round 

 spiracle, and the pale intermediate line still exists, but is hardly 

 recognisable as a line, and there is a pale patch between this and 

 the oblique line, usually attached to the lower margin of the front 

 end of the oblique line. The honey-gland is distinct as a transverse 

 line with 8 or 10 hairs and lenticles roimd it, but not close to it. 



The armature of hairs, lenticles, etc., is shown in PL XL. 

 It will be noticed that the hairs of the dorsal and lateral 

 flanges, and of the minor series half-way up the flange, are 

 more definitely separated from each other by a considerable 

 increase of the smaller intermediate hairs. 



PL XXVI shows larvae at this stage. Figs. 1, 2, 3, of 

 P. icarus and 7 and 8 oi A. ther sites. 



Sept. 13, 1913. A. thersites. One specimen moulted to 

 4th instar on 8th and another since (11th?). They are 

 now very short thick fat larvae; the smaller 4" 5 mm. long, 

 2 mm. wide, 11 mm. high (contracted and sulky); the 

 larger 6'0 mm. long, 2*2 mm. wide, 1*8 mm. high. Dark 

 glaucous green, with indications of a yellowish line in each 

 dorsal flange and a little less indistinct yellow lateral 

 flange line, a line of rather darker marks above spiracles 

 and a lighter green (yellowish oblique) line bordering this 

 above, and a parallel one higher up, starting from dorsal 



* Their greater length does not exceed the proportion of 8 to 7, 

 a proportional increase would be as 5 to 3. 



