160 BRITISH BUTTERFLIES. 



pression confined to each segment. The prothorax and the sides of 

 the body with a fringe of protuberant hairs. The body is covered with 

 hairs, white, generally somewhat curved, amongst which the true 

 tubercular setse stand out as much longer, stouter, and better-developed 

 hairs. The dorsal tubercles carry long, backward-projecting, spiculate 

 seta3, situated on the apices of the dorsal ridges, dark in some lights, 

 sparkling like silver in others, and the lateral setas are somewhat 

 similar ; the dorsal setae on the lst-8th abdominal segments 

 appear to be much stronger and coarser than any others, except those 

 on the lateral flange and anal segments. The spiracles are small, 

 directly above the marginal flange, almost flesh-coloured in tint, that 

 on the 8th abdominal rather higher, and with the prothoracic more 

 conspicuous than the others. The prothorax protuberant, with a pale 

 mediodorsal plate towards the posterior edge. The true legs dark 

 greenish, with dark hooks, the prolegs green (Tutt, April 18th, 

 1907). [For details of structure of larva, in third and fourth 

 stadia, see "Addendum" at end of our account of this species.] Pen- 

 ultimate instar : (1) At rest, 7mm. long ; 3mm. wide at broadest part. 

 Head wholly retractile in prothorax, and latter also in part in meso- 

 thorax, presenting the mesothorax as a rounded front (from which the 

 prothorax partly protrudes) ; the anal segments tapering slightly, but 

 broad at end. The body slopes upwards at sides from lateral flange to 

 longitudinal dorsal ridge, which is double and slightly depressed between 

 thet wo parts; in front, the body also slopes upwards to the 1st and 2nd 

 abdominal segments, which are the highest and widest part of body. 

 The general ground colour is of a pale yellowish-green, shading off to 

 quite yellow at the anal segment ; a conspicuous mediodorsal line of a 

 darker green tinge runs from head to anus, between the two elements 

 of the dorsal ridge, single on the thoracic and anal segments, double 

 from the 1st to 6th abdominal segments, and being very dark tinted 

 on the mesothorax and 9th and 10th abdominals. The colour, under 

 a lens, resolves itself into a yellow ground colour with oblique green 

 lines running from front to back from the mediodorsal line, through 

 the spiracle, over three segments, and ending on the lateral flange ; 

 seven of these oblique lines are distinctly marked, those commencing on 

 the metathorax, and thelst to 6th abdominals ; in front and behind they 

 are less defined. The lateral flange is subspiracular, rather paler in 

 colour than the ground ; the venter is flat, appressed closely to resting- 

 surface. The surface of the skin is covered with minute glassy-looking 

 points, giving rise to short pale hairs, whilst the dorsal tubercular 

 areas carry darker ones. The segmental incisions are deeply cleft. 

 Frontal view: Head small, oval, shiny black; mouth-parts blackish- 

 brown, with a pale transverse line separating mouth-parts from frons 

 and cheeks, antenme black with pale base ; several fine pale hairs on 

 front part of face, head-part quite smooth. Prothorax green, the 

 retractile portion in front largely free from hairs ; a well-raised trans- 

 verse ridge across the middle plentifully beset with longish pale hairs ; 

 at back edge of prothorax a chitinous-looking pad, placed medially, 

 flesh-coloured, shaded with brown on edges. The prothoracic spiracle is 

 small, flesh-coloured, and placed far back on the prothorax towards 

 the segmental incision. Dorsally : The outline is in the form of an 

 oval, rather wider in front ; the larva also much thicker at widest part 

 (1st and 2nd abdominals) ; each segment distinctly hooped ; the 

 lateral flange on either side somewhat glassy-looking, cut up by the 



